Unilateral Neck Mass in a Neonate

A previously healthy 3-week-old child presented to the emergency room for evaluation of acute-onset left-sided neck swelling. The parents initially noticed it during the previous week and had brought him to the pediatrician, who felt it was a reactive lymph node. However, owing to a concern about the increasing size, they brought him in for reevaluation. Examination revealed a 2 × 2 cm, firm, nontender mass in the lower left neck with no overlying skin changes (Figure 1). There was no obvious limitation in range of motion.

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