A 5-week-old boy presented with a mass on the right side of his neck noted immediately at birth, with no subsequent reported change in size or shape. He had no respiratory distress, breastfeeding difficulties, or systemic infectious or inflammatory manifestations. The child was born full term by cesarean delivery following an uncomplicated pregnancy with normal results on fetal ultrasonography (US).
On physical examination, the infant appeared healthy, was breathing comfortably, and had a normal cry. The mass on the right side of his neck measured approximately 2 cm in diameter, was nontender, somewhat compressible but firm, with no discoloration of the overlying skin. Findings from the otolaryngology assessment were otherwise normal with the exception of the laryngeal examination, which revealed an immobile right true vocal fold and compensatory movement of the left true vocal fold.