Lateral Neck Radiograph for Upper Airway Assessment

A lateral neck radiograph is an x-ray image taken from the side of the neck to evaluate the upper airway, soft tissues, and surrounding structures. In respiratory care, it is most often discussed in relation to pediatric upper-airway obstruction, especially when a child presents with stridor, respiratory distress, or suspected airway narrowing.

This radiograph can help identify conditions such as epiglottitis, croup, enlarged adenoids or tonsils, foreign-body aspiration, retropharyngeal abscess, hematoma, or airway tumors. However, it must be used carefully because some airway emergencies require immediate airway protection rather than delayed imaging.

What Is a Lateral Neck Radiograph?

A lateral neck radiograph is a diagnostic x-ray that shows the neck from the side. This view allows clinicians to examine the soft tissues of the upper airway, including the nasopharynx, oropharynx, epiglottis, larynx, trachea, and surrounding spaces. It can help show whether the airway is open, narrowed, displaced, or partially obstructed.

In respiratory care education, the lateral neck radiograph is commonly associated with pediatric airway assessment. Children have smaller airways than adults, so even a modest amount of swelling can cause significant obstruction. For this reason, radiographic signs of upper-airway narrowing are especially important in pediatric patients.

The test is not ordered for every patient with breathing difficulty. Instead, it is selected when the clinical presentation suggests an upper-airway problem. A child with stridor, drooling, sudden respiratory distress, suspected foreign-body aspiration, or signs of infection around the upper airway may need imaging as part of the evaluation.

Note: The purpose is to answer a specific clinical question, such as whether the obstruction is caused by epiglottitis, croup, a foreign body, or another lesion.

Why Lateral Neck Radiographs Matter in Respiratory Care

Respiratory therapists must understand when a lateral neck radiograph is helpful and when it could delay urgent care. The image can provide useful diagnostic information, but the patient’s airway status always comes first.

In many respiratory emergencies, assessment begins with observation. The therapist looks for stridor, retractions, drooling, changes in voice, posture, cyanosis, agitation, and work of breathing. These signs can indicate upper-airway obstruction. A lateral neck radiograph may then help identify the cause, especially when the patient is stable enough to tolerate the procedure.

This is particularly important for board exams because neck x-rays are commonly tied to classic airway findings. A swollen epiglottis on a lateral neck radiograph suggests epiglottitis. Subglottic narrowing on an AP neck or chest image suggests croup. A radiopaque object in the airway may suggest foreign-body aspiration. Soft tissue swelling may suggest abscess, hematoma, or other airway compromise.

Note: The key is not simply knowing what the radiograph shows. The respiratory therapist must match the finding to the clinical picture.

Common Indications

A lateral neck radiograph may be used when clinicians suspect an upper-airway disorder. Common indications include stridor, respiratory distress, suspected foreign-body aspiration, suspected epiglottitis, suspected croup, enlarged tonsils or adenoids, retropharyngeal abscess, hematoma, cervical spine injury, and airway narrowing from a mass or tumor.

Stridor is one of the most important clues. It is a high-pitched sound caused by turbulent airflow through a narrowed upper airway. Inspiratory stridor usually points to obstruction above or near the larynx. When stridor is present with fever, drooling, barking cough, sudden choking, or respiratory distress, imaging may help narrow the diagnosis.

A lateral neck radiograph may also be used when clinicians suspect a foreign body in the upper airway. Metallic objects, such as coins, may appear clearly on x-ray because they are radiopaque. Organic materials, such as peanuts, seeds, or some food particles, may not be visible. In those cases, clinicians may look for indirect signs, such as distortion or narrowing of the dark air column.

Pediatric Airway Assessment

Children are a major focus when discussing lateral neck radiographs because pediatric upper-airway obstruction can worsen quickly. The pediatric airway is smaller in diameter, and the tissues can swell significantly during infection or inflammation. This means a child may develop serious respiratory distress from swelling that would be less dangerous in an adult.

Common pediatric airway conditions evaluated with neck imaging include croup, epiglottitis, foreign-body aspiration, tonsillar enlargement, adenoidal enlargement, and retropharyngeal infection. These problems may produce similar signs, such as stridor and increased work of breathing, but their treatment priorities are very different.

For example, croup is usually viral and often managed with supportive care, corticosteroids, nebulized racemic epinephrine, oxygen, and sometimes heliox. Epiglottitis is a dangerous airway emergency that may require controlled intubation. A foreign body may require bronchoscopy or another removal procedure. Because treatment differs, the therapist must understand how the clinical presentation and radiographic findings fit together.

Enlarged Tonsils and Adenoids

One use of the lateral neck radiograph is the evaluation of enlarged tonsils and adenoids. The palatine tonsils are located in the throat, while the pharyngeal tonsils, commonly called adenoids, are located in the nasopharynx. These lymphoid tissues can enlarge during infection or chronic inflammation.

Enlarged adenoids may narrow the nasopharyngeal airway. Enlarged tonsils may narrow the oropharyngeal airway. In children, this narrowing can contribute to noisy breathing, mouth breathing, snoring, recurrent infections, and obstructive sleep apnea.

On a lateral neck radiograph, enlarged adenoids may appear as soft tissue fullness in the nasopharynx. Enlarged tonsils may be visible in the throat region. The image can help show how much the upper airway is narrowed by these tissues.

Note: This finding is usually not as urgent as epiglottitis or acute airway obstruction, but it is still clinically important. Chronic upper-airway narrowing can affect sleep quality, ventilation during sleep, and overall respiratory function.

Epiglottitis

Epiglottitis is one of the most important conditions associated with a lateral neck radiograph. It is inflammation and swelling of the epiglottis and nearby supraglottic structures. The epiglottis normally helps protect the airway during swallowing. When it becomes swollen, it can obstruct airflow into the trachea.

Epiglottitis is a medical emergency because it can progress rapidly to complete airway obstruction. The condition has historically been associated with Haemophilus influenzae type B infection, although other organisms may also be involved. Vaccination has reduced the frequency of pediatric cases, but epiglottitis still remains a critical diagnosis because of the risk of sudden airway compromise.

A child with epiglottitis may appear severely ill. Common signs include high fever, sore throat, difficulty swallowing, drooling, muffled voice, stridor, retractions, anxiety, and labored breathing. The child may sit upright and lean forward in a tripod position to keep the airway open. The child may refuse to lie down because certain positions can worsen obstruction.

Note: The absence of a barking cough also helps distinguish epiglottitis from croup. In epiglottitis, the voice may sound muffled rather than hoarse, and swallowing may be very painful or difficult.

The Thumb Sign

The classic lateral neck radiograph finding in epiglottitis is the thumb sign. This occurs when the normally thin epiglottis becomes swollen, thickened, and rounded. On the lateral view, the enlarged epiglottis can resemble the shape of a thumb.

The thumb sign is a high-yield exam association: lateral neck radiograph plus thumb sign suggests epiglottitis.

Other findings may include swelling of the aryepiglottic folds and poor visualization of the vallecula. These changes reflect supraglottic swelling, which is the main airway problem in epiglottitis.

Although the radiographic finding is important, the patient’s condition matters more than the image. A child with classic signs of epiglottitis should be treated as an airway emergency even before the x-ray is obtained. Imaging can support the diagnosis, but airway protection is the priority.

Safety Precautions in Suspected Epiglottitis

A major safety point is that a child with suspected epiglottitis should not be laid supine for a neck radiograph. Lying flat can allow the swollen epiglottis to fall backward and obstruct the airway. This can lead to sudden and potentially fatal airway closure.

The child should be allowed to remain upright and in the most comfortable position. Clinicians should avoid unnecessary procedures that increase anxiety, agitation, or airway stimulation. This includes aggressive throat examination, unnecessary venipuncture before airway control, and attempts to visualize the throat in an uncontrolled setting.

Direct examination of the upper airway can provoke worsening obstruction. If visualization is needed, it should be performed by skilled personnel in a controlled environment where emergency airway management is immediately available.

For respiratory therapists, the main responsibility is to support oxygenation and ventilation without worsening the child’s distress. Oxygen may be given as needed, but the method should be as nonthreatening as possible.

Note: The respiratory therapist should be prepared for rapid deterioration and assist with airway management if intubation becomes necessary.

Croup

Croup, also called laryngotracheobronchitis, is another major condition discussed with neck imaging. It is usually a viral infection that causes inflammation and swelling of the larynx, trachea, and larger bronchi. The most important area of narrowing is usually below the vocal cords in the subglottic region.

Croup commonly affects young children, especially those between 6 months and 3 years of age, although age ranges may vary slightly by source. It often begins with cold-like symptoms, such as runny nose, mild fever, and cough. Symptoms may worsen at night and progress to a barking cough, hoarseness, inspiratory stridor, and increased work of breathing.

Mild croup may cause only a barking cough and mild stridor. More severe cases may include retractions, tachypnea, tachycardia, agitation, and hypoxemia. Late signs, such as lethargy, cyanosis, or decreased respiratory effort, suggest impending respiratory failure.

Note: Unlike epiglottitis, croup usually has a slower onset. It often develops over 24 to 48 hours rather than suddenly over a few hours. Drooling and severe dysphagia are usually absent. The child may look uncomfortable, but often does not appear as toxic as a child with epiglottitis.

The Steeple Sign

Croup is classically associated with subglottic narrowing, often called the steeple sign, steepling, or pencil sign. This sign occurs because swollen mucous membranes narrow the upper tracheal air column below the larynx. The normally wider air column tapers to a point, resembling a church steeple or pencil tip.

A key nuance is that the steeple sign is best associated with an AP neck or chest image rather than the lateral neck view. On a lateral neck radiograph, croup may appear normal because the supraglottic structures may not be significantly involved. This distinction is important for exams.

Some discussions still mention lateral neck radiographs in croup because they may show haziness or soft tissue swelling in the subglottic area. However, the classic board-style association is:

• Croup equals barking cough, viral illness, hoarseness, subglottic edema, and steeple sign.
• Epiglottitis equals high fever, drooling, dysphagia, tripod position, supraglottic swelling, and thumb sign on lateral neck radiograph.

Croup vs. Epiglottitis

Distinguishing croup from epiglottitis is one of the most important uses of neck imaging in respiratory care exam preparation. Both conditions can produce stridor and respiratory distress, but they differ in onset, symptoms, severity, radiographic findings, and treatment priorities.

Croup usually has a gradual onset. It often starts with upper respiratory infection symptoms and progresses to barking cough, hoarseness, and inspiratory stridor. Fever may be absent or low grade. Drooling is usually absent because swallowing is not severely impaired. The child may have subglottic narrowing, producing the steeple sign.

Epiglottitis usually has an abrupt onset. The child may develop high fever, severe sore throat, difficulty swallowing, drooling, muffled voice, anxiety, and tripod positioning. The airway obstruction is supraglottic, and the lateral neck radiograph may show the thumb sign.

Treatment also differs. Croup may be treated with cool bland aerosol therapy, corticosteroids, nebulized racemic epinephrine, oxygen, and heliox depending on severity. Epiglottitis requires airway protection, careful handling, antibiotics after cultures, and possible intubation in a controlled setting.

Note: The safest answer in suspected epiglottitis is often to avoid actions that upset the child or delay airway management.

Foreign-Body Aspiration

A lateral neck radiograph may also help evaluate suspected foreign-body aspiration. This is especially important in children, who may aspirate small toys, food items, coins, teeth, pins, seeds, nuts, or other objects.

The history is often a major clue. Sudden breathing difficulty, coughing, choking, wheezing, inspiratory stridor, or unilateral breath sound changes may suggest aspiration. If the object lodges in the upper airway or trachea, it may cause acute obstruction. If it travels into a bronchus, it may cause localized wheezing, air trapping, atelectasis, or recurrent infection.

Radiographs are more helpful when the object is radiopaque. Metallic objects, such as coins, appear white on x-ray. Some inorganic objects may also be visible. However, many aspirated items are radiolucent, meaning they do not appear clearly on standard x-ray. Food items, nuts, seeds, and plastic toy pieces may be difficult to see because their density is similar to surrounding tissue.

When the foreign body is not directly visible, clinicians look for indirect signs. These may include narrowing, distortion, or interruption of the dark airway column. Chest imaging may show air trapping, atelectasis, or localized hyperinflation. A combined chest and neck radiograph may be useful when the location is uncertain.

Note: The respiratory therapist should remember that a normal x-ray does not always rule out aspiration. If the history and symptoms strongly suggest foreign-body aspiration, further evaluation may still be needed.

Retropharyngeal Abscess and Hematoma

A lateral neck radiograph may also help detect retropharyngeal abscesses and hematomas. These conditions involve swelling or fluid collection in the soft tissues behind the pharynx. As the retropharyngeal space enlarges, it can push into the airway and cause obstruction.

A retropharyngeal abscess is usually related to infection. It may cause fever, neck pain, difficulty swallowing, drooling, muffled voice, and respiratory distress. Young children are more vulnerable because of the anatomy and lymphatic tissue in the neck.

A hematoma may occur after trauma, surgery, or bleeding into the soft tissues of the neck. As blood accumulates, it can compress the airway. This can be dangerous because swelling may progress over time.

Note: On lateral neck imaging, these conditions may show increased prevertebral soft tissue thickness or displacement of the airway. These findings can help identify the source of obstruction, but airway assessment remains the priority.

Airway Tumors and Masses

Airway narrowing may also occur from tumors or masses. A tumor may grow inside the airway lumen or compress the larynx, trachea, or bronchi from the outside. Either mechanism can reduce airflow and produce symptoms such as stridor, cough, dyspnea, hoarseness, or recurrent airway obstruction.

In respiratory care texts, tumors of the mouth, throat, and lungs are often connected with tobacco exposure, including smoking and chewing tobacco. While tumors are not the most common reason for pediatric lateral neck imaging, they are part of the broader differential diagnosis for airway narrowing.

Note: A lateral neck radiograph may show narrowing, displacement, or distortion of the airway column. Additional imaging, such as CT, MRI, or endoscopic evaluation, may be needed to define the lesion more clearly.

Cervical Spine Injury

A lateral neck radiograph may also be obtained when cervical spine injury is suspected. This is not the main respiratory care focus, but it matters because trauma patients may have airway and spine concerns at the same time.

For example, a patient with head, neck, or facial trauma may require airway support while also needing cervical spine precautions. In this setting, clinicians must protect the spine while maintaining ventilation and oxygenation. Imaging may help evaluate the cervical spine, but airway emergencies must still be managed immediately.

Note: The respiratory therapist should avoid unnecessary neck movement and follow spinal precautions when assisting with airway management in trauma patients.

What a Lateral Neck Radiograph Is Not Used For

A lateral neck radiograph is not the preferred test for confirming the distal tip position of an endotracheal tube. Tube placement is usually confirmed with a chest radiograph, along with clinical assessment methods such as bilateral breath sounds, chest rise, oxygenation, capnography, and absence of gastric insufflation.

This is an important exam point. If a patient has been intubated, the appropriate radiographic study to confirm tube position is generally a chest x-ray, not a lateral neck x-ray.

A lateral neck radiograph should also not delay ventilation during airway failure. If a patient cannot be ventilated with a mouth-to-valve device or another ventilation method, requesting a neck x-ray would waste critical time. The immediate priority is to correct ventilation, open the airway, reposition as appropriate, use proper adjuncts, suction if needed, and escalate airway management.

Note: Imaging is helpful only when the patient is stable enough, and the result will guide care.

Role in Information Gathering

A lateral neck radiograph may be useful when the patient’s presentation suggests upper-airway obstruction. It is not a routine choice for every respiratory problem. The candidate must choose it when it helps answer the clinical question.

Appropriate uses include differentiating croup from epiglottitis, evaluating stridor, identifying a radiopaque aspirated foreign body, and assessing possible retropharyngeal abscess or hematoma. The test is most useful when the symptoms point to the upper airway rather than the lower lungs.

For example, a child with barking cough, hoarseness, and inspiratory stridor may justify neck imaging to evaluate croup. A child with drooling, fever, dysphagia, and tripod positioning may suggest epiglottitis, although airway safety may be more important than imaging. A child with sudden choking and stridor may need imaging to look for a foreign body if the patient is stable.

Note: The radiograph should not be ordered just because the patient is short of breath. Lower-airway diseases such as asthma, pneumonia, pulmonary edema, and bronchiolitis usually require different diagnostic studies.

How to Think Through Exam Questions

When an exam question mentions a lateral neck radiograph, first identify the patient’s symptoms. The radiograph should be interpreted in context.

• If the question describes high fever, drooling, dysphagia, muffled voice, tripod posture, and stridor, think of epiglottitis. The expected lateral neck finding is the thumb sign. The safest management is to avoid upsetting the child, avoid direct throat examination, keep the child upright, provide oxygen carefully, and prepare for controlled airway management.
• If the question describes barking cough, hoarseness, low-grade fever, and stridor after a viral illness, think of croup. The expected imaging clue is subglottic narrowing, often called the steeple sign. Treatment may include corticosteroids, nebulized racemic epinephrine, cool mist, oxygen, and heliox depending on severity.
• If the question describes sudden choking, coughing, or stridor after playing with small objects or eating, think of foreign-body aspiration. A radiopaque object may be visible, but radiolucent objects may require indirect signs or further evaluation.
• If the question asks whether a lateral neck radiograph should be ordered during failed ventilation, the answer is no. Ventilation must be restored immediately.
• If the question asks how to confirm endotracheal tube tip location, choose chest radiograph and clinical confirmation methods, not a lateral neck radiograph.

Clinical Priorities

The lateral neck radiograph is useful, but it does not replace clinical judgment. A patient with upper-airway obstruction can deteriorate quickly. The respiratory therapist must recognize signs of worsening airway compromise, including increasing stridor, retractions, agitation, cyanosis, decreasing breath sounds, lethargy, and reduced respiratory effort.

In suspected epiglottitis, the safest approach is to minimize agitation and maintain the child’s preferred position. Do not force the child to lie down. Do not attempt direct throat inspection in an uncontrolled setting. Do not delay airway management for unnecessary testing.

In suspected croup, the therapist should assess severity. Mild cases may only need observation and supportive care. Moderate or severe cases may require oxygen, nebulized racemic epinephrine, corticosteroids, and close monitoring.

In suspected foreign-body aspiration, the therapist should assess the degree of obstruction. Complete obstruction requires immediate emergency intervention. Partial obstruction may allow time for imaging and specialist evaluation, but deterioration can occur.

Lateral Neck Radiograph Practice Questions

1. What is a lateral neck radiograph?
A lateral neck radiograph is an x-ray image taken from the side of the neck to evaluate the upper airway, soft tissues, and surrounding structures.

2. Why is a lateral neck radiograph commonly used in pediatric airway assessment?
It is commonly used because children can develop significant upper-airway obstruction from swelling, infection, enlarged tissues, or foreign-body aspiration.

3. What is the main respiratory care purpose of a lateral neck radiograph?
The main purpose is to help identify the cause of upper-airway obstruction, especially in patients with stridor or respiratory distress.

4. Which airway sound often suggests upper-airway obstruction?
Stridor often suggests upper-airway obstruction.

5. What classic lateral neck radiograph finding is associated with epiglottitis?
The classic finding is the thumb sign.

6. What causes the thumb sign in epiglottitis?
The thumb sign is caused by swelling and thickening of the epiglottis.

7. Why does the swollen epiglottis resemble a thumb on x-ray?
The normally thin epiglottis becomes enlarged, rounded, and thickened, giving it a thumb-like appearance.

8. What area of the airway is primarily affected in epiglottitis?
Epiglottitis primarily affects the supraglottic airway.

9. What symptoms are commonly seen with epiglottitis?
Common symptoms include high fever, drooling, difficulty swallowing, muffled voice, stridor, anxiety, and labored breathing.

10. Why is epiglottitis considered a medical emergency?
Epiglottitis is considered a medical emergency because swelling can rapidly progress to complete airway obstruction.

11. What position might a child with epiglottitis prefer?
A child with epiglottitis may prefer to sit upright and lean forward in the tripod position.

12. Why should a child with suspected epiglottitis not be laid supine?
Laying the child supine can cause the swollen epiglottis to obstruct the tracheal opening and worsen airway compromise.

13. What should be avoided when epiglottitis is suspected?
Direct throat examination and unnecessary airway stimulation should be avoided because they may trigger sudden airway obstruction.

14. What is croup also called?
Croup is also called laryngotracheobronchitis.

15. What part of the airway is mainly affected in croup?
Croup mainly affects the subglottic area of the larynx and trachea.

16. What classic radiographic sign is associated with croup?
The classic sign associated with croup is the steeple sign.

17. What causes the steeple sign in croup?
The steeple sign is caused by subglottic narrowing from swollen mucous membranes.

18. Which x-ray view is most commonly associated with the steeple sign?
The steeple sign is most commonly associated with an AP neck or chest x-ray.

19. How may croup appear on a lateral neck radiograph?
Croup may appear normal on a lateral neck radiograph because there may be little or no supraglottic involvement.

20. What symptoms are commonly associated with croup?
Common symptoms include barking cough, hoarseness, inspiratory stridor, low-grade fever, and cold-like symptoms.

21. How does the onset of croup usually differ from epiglottitis?
Croup usually develops gradually over 24 to 48 hours, while epiglottitis often has an abrupt onset over a few hours.

22. Which condition is more likely to cause drooling, croup or epiglottitis?
Epiglottitis is more likely to cause drooling because swallowing is painful and difficult.

23. Which condition is more likely to cause a barking cough?
Croup is more likely to cause a barking cough.

24. What lateral neck radiograph finding suggests epiglottitis rather than croup?
A swollen epiglottis with the thumb sign suggests epiglottitis rather than croup.

25. What radiographic finding suggests croup rather than epiglottitis?
Subglottic narrowing with the steeple sign suggests croup rather than epiglottitis.

26. What type of airway obstruction is most commonly evaluated with a lateral neck radiograph?
A lateral neck radiograph is most commonly used to evaluate suspected upper-airway obstruction.

27. What does supraglottic haziness on a lateral neck radiograph suggest?
Supraglottic haziness may suggest epiglottitis because the swelling is located above the glottis.

28. What does subglottic haziness suggest on neck imaging?
Subglottic haziness suggests swelling below the vocal cords, which is commonly associated with croup.

29. Why must croup and epiglottitis be differentiated quickly?
They must be differentiated because epiglottitis can rapidly progress to complete airway obstruction, while croup is usually less emergent.

30. Which condition is commonly associated with a muffled voice?
Epiglottitis is commonly associated with a muffled voice.

31. Which condition is commonly associated with hoarseness?
Croup is commonly associated with hoarseness.

32. Which condition is more likely to have a low-grade fever?
Croup is more likely to have a low-grade fever.

33. Which condition is more likely to have a high fever?
Epiglottitis is more likely to have a high fever.

34. What does dysphagia mean in the context of epiglottitis?
Dysphagia means difficulty swallowing, which may occur because the inflamed epiglottis and surrounding tissues are swollen and painful.

35. Why may a child with epiglottitis drool?
A child with epiglottitis may drool because swallowing is difficult or painful.

36. What is the safest position for a child with suspected epiglottitis?
The safest position is upright in the position the child finds most comfortable.

37. Why should procedures be minimized in suspected epiglottitis?
Procedures should be minimized because agitation or stimulation can worsen upper-airway obstruction.

38. What should the respiratory therapist prioritize in suspected epiglottitis?
The respiratory therapist should prioritize airway safety, oxygenation, ventilation support, and avoiding unnecessary distress.

39. What organism was traditionally associated with epiglottitis?
Epiglottitis was traditionally associated with Haemophilus influenzae type B.

40. How have vaccination programs affected pediatric epiglottitis?
Vaccination programs have helped reduce the incidence of epiglottitis in children.

41. What is the vallecula?
The vallecula is the space near the base of the tongue and epiglottis that may be difficult to visualize when epiglottic swelling is present.

42. What lateral neck radiograph finding may occur with swollen aryepiglottic folds?
Swollen aryepiglottic folds may appear as soft tissue swelling around the supraglottic airway.

43. What finding may accompany the thumb sign in epiglottitis?
Loss of visualization of the vallecula may accompany the thumb sign in epiglottitis.

44. Why is direct visualization of the throat dangerous in suspected epiglottitis?
Direct visualization can stimulate the inflamed airway and cause sudden worsening of obstruction.

45. When should airway visualization be performed in epiglottitis?
Airway visualization should be performed only in a controlled setting by skilled personnel.

46. What is the main location of swelling in croup?
The main location of swelling in croup is the subglottic region.

47. What causes the barking cough in croup?
The barking cough is caused by inflammation and swelling of the larynx and trachea.

48. What treatment may reduce mucosal swelling in croup by vasoconstriction?
Nebulized racemic epinephrine may reduce mucosal swelling by causing vasoconstriction.

49. What medication class is commonly used to reduce airway inflammation in croup?
Corticosteroids are commonly used to reduce airway inflammation in croup.

50. What gas mixture may be used in some cases of severe croup?
Heliox may be used in some cases to reduce the work of breathing through a narrowed upper airway.

51. What does a radiopaque foreign body look like on x-ray?
A radiopaque foreign body appears as a solid white object on x-ray.

52. What is an example of a radiopaque aspirated foreign body?
A coin is an example of a radiopaque aspirated foreign body.

53. Why are peanuts difficult to see on a standard x-ray?
Peanuts are difficult to see because they are radiolucent and have a density closer to body tissue.

54. What types of aspirated objects may not appear clearly on x-ray?
Plastic toy pieces, seeds, nuts, and food particles may not appear clearly on x-ray.

55. What indirect sign may suggest a radiolucent foreign body in the airway?
Narrowing or distortion of the dark airway column may suggest a radiolucent foreign body.

56. What history may suggest foreign-body aspiration in a child?
A sudden episode of choking, coughing, breathing difficulty, or stridor may suggest foreign-body aspiration.

57. Why may both chest and neck x-rays be ordered for suspected foreign-body aspiration?
Both may be ordered to help locate the object and evaluate whether it is in the upper airway, trachea, or lower airway.

58. Does a normal x-ray always rule out foreign-body aspiration?
No. A normal x-ray does not always rule out foreign-body aspiration because some objects are radiolucent.

59. What should clinicians look for if an aspirated object is not visible on x-ray?
They should look for indirect signs such as airway narrowing, distortion, obstruction, air trapping, or atelectasis.

60. What is another noninfectious cause of airway narrowing that may be seen on imaging?
An airway tumor or mass may cause airway narrowing.

61. How can a tumor narrow the airway?
A tumor can grow inside the airway lumen or compress the airway from outside.

62. What tobacco exposures are associated with mouth, throat, and lung cancers?
Smoking and chewing tobacco are associated with mouth, throat, and lung cancers.

63. What soft tissue infection may be evaluated with a lateral neck radiograph?
A retropharyngeal abscess may be evaluated with a lateral neck radiograph.

64. What is a retropharyngeal abscess?
A retropharyngeal abscess is a collection of infection behind the pharynx that can narrow or compress the upper airway.

65. What is a hematoma?
A hematoma is a collection of blood that may compress surrounding tissues, including the airway.

66. Why can retropharyngeal swelling become dangerous?
Retropharyngeal swelling can become dangerous because it may push into the airway and cause obstruction.

67. What is one possible radiographic clue of retropharyngeal abscess or hematoma?
Increased prevertebral soft tissue thickness may suggest retropharyngeal abscess or hematoma.

68. Why is a lateral neck radiograph not ordered routinely for every respiratory patient?
It is not routine because it is mainly useful when signs and symptoms suggest an upper-airway problem.

69. What clinical question should guide the use of a lateral neck radiograph?
The test should help answer what is causing the patient’s upper-airway obstruction or respiratory distress.

70. What type of radiograph is recommended to confirm endotracheal tube tip position?
A chest radiograph is recommended to confirm endotracheal tube tip position.

71. Why is a lateral neck radiograph not recommended for confirming distal endotracheal tube placement?
It does not adequately confirm the distal tube tip position in the trachea compared with a chest radiograph.

72. What bedside finding helps confirm proper endotracheal tube placement?
Bilateral breath sounds help confirm proper endotracheal tube placement.

73. Why should a lateral neck radiograph not be requested during failed ventilation?
It would dangerously delay ventilation when immediate airway support is needed.

74. What should be prioritized during failed ventilation?
Restoring ventilation and oxygenation should be prioritized.

75. What is the safest approach when imaging could delay emergency airway management?
The safest approach is to manage the airway first and avoid delaying urgent oxygenation or ventilation for imaging.

76. What does PA neck radiograph mean?
A PA neck radiograph is a posteroanterior neck x-ray taken with the beam passing from back to front.

77. Why might a PA neck radiograph be used along with a lateral neck radiograph?
It may be used to provide another view of the upper airway and help identify airway narrowing or obstruction.

78. What does a clear upper-airway column with narrowing below the larynx suggest?
It suggests subglottic narrowing, which is most consistent with croup.

79. What does haziness above the glottis suggest?
Haziness above the glottis suggests supraglottic swelling, which is associated with epiglottitis.

80. What does haziness below the glottis suggest?
Haziness below the glottis suggests subglottic swelling, which is associated with croup.

81. What age group is commonly associated with croup?
Croup commonly affects young children, especially those around 6 months to 3 years old.

82. What age group is commonly associated with epiglottitis?
Epiglottitis commonly affects young children, often around 2 to 8 years old.

83. Which condition usually has a slower onset, croup or epiglottitis?
Croup usually has a slower onset.

84. Which condition usually has an abrupt onset, croup or epiglottitis?
Epiglottitis usually has an abrupt onset.

85. What type of infection is croup usually associated with?
Croup is usually associated with a viral upper-airway infection.

86. What type of infection is epiglottitis usually associated with?
Epiglottitis is usually associated with a bacterial upper-airway infection.

87. Why is immunization status important in suspected epiglottitis?
Immunization status is important because Haemophilus influenzae type B has historically been a major cause of epiglottitis.

88. What does a tripod position suggest in a child with stridor?
A tripod position suggests significant upper-airway obstruction and is commonly associated with epiglottitis.

89. What does a muffled inspiratory stridor suggest?
Muffled inspiratory stridor may suggest epiglottitis.

90. What does loud, high-pitched inspiratory stridor suggest?
Loud, high-pitched inspiratory stridor may suggest croup or another upper-airway obstruction.

91. Why is the patient’s history important when interpreting a lateral neck radiograph?
The history helps connect radiographic findings with the likely cause of airway obstruction.

92. Why is the physical examination important before recommending neck imaging?
The physical examination helps determine whether the patient has signs of upper-airway obstruction and whether imaging is safe.

93. What should be considered when a child has sudden stridor after eating?
Foreign-body aspiration should be considered.

94. What should be considered when a child has stridor, fever, and drooling?
Epiglottitis should be considered.

95. What should be considered when a child has barking cough, hoarseness, and stridor?
Croup should be considered.

96. What does enlarged adenoid tissue do to the upper airway?
Enlarged adenoid tissue can narrow the nasopharyngeal airway.

97. How can enlarged tonsils affect breathing?
Enlarged tonsils can narrow the throat region and contribute to upper-airway obstruction.

98. What sleep-related disorder may be associated with enlarged tonsils or adenoids?
Obstructive sleep apnea may be associated with enlarged tonsils or adenoids.

99. What is the main exam association for lateral neck radiograph and epiglottitis?
The main association is the thumb sign caused by a swollen epiglottis.

100. What is the most important safety principle when using lateral neck radiographs in airway emergencies?
The most important safety principle is that imaging should never delay airway protection, oxygenation, or ventilation.

Final Thoughts

A lateral neck radiograph is a focused imaging study used to evaluate suspected upper-airway obstruction, especially in children. It can help identify enlarged adenoids or tonsils, epiglottitis, croup, foreign-body aspiration, retropharyngeal abscess, hematoma, tumors, and airway narrowing.

For exam preparation, the most important associations are thumb sign with epiglottitis and steeple sign with croup, while remembering that the steeple sign is usually seen on AP neck or chest imaging. The most important clinical principle is that imaging should never take priority over airway safety, oxygenation, ventilation, and careful patient positioning.