B. ASKINFREDERICMDH. WESTRAWILLIAMMD
A 3-MONTH-OLD boy presented after having an apparent life-threatening event consisting of a flaccid unresponsive episode. Since birth, he had displayed intermittent episodes of stridor and stertor. His gestational history and medical history were otherwise unremarkable. Physical examination showed no evidence of upper airway obstruction or neck mass. An anteroposterior plain radiograph of the neck showed tracheal buckling to the right. A magnetic resonance imaging study with gadolinium–diethylenetriamine pentaacetic acid showed a well-delineated mass in the left side of the neck, anterior to the great vessels and anteromedial to the sternocleidomastoid muscle (Figure 1). Images of the chest showed that all mediastinal components, including thymic tissue, were normal.
Shah UK, Fuleihan NS, Handler SD, Kallman JE, Fear DR. Pathologic Quiz Case 2. Arch Otolaryngol Head Neck Surg. 1999;125(6):694-697. doi: