What characteristic sign is seen on a lateral x-ray for epiglottitis?

The thumb sign is a characteristic finding on a lateral x-ray of the neck in cases of epiglottitis. This sign appears as a swollen, enlarged epiglottis that resembles a thumb, which indicates significant inflammation and edema of the tissue. In epiglottitis, the epiglottis can become inflamed and obstruct the airway, making this radiographic sign critical for diagnosis.

The identification of the thumb sign in imaging is particularly important in pediatric patients, who are most commonly affected by this condition. Early recognition of the thumb sign can prompt urgent intervention to secure the airway and manage the patient appropriately. This is essential to prevent severe complications associated with airway obstruction.