Toddler with purulent drainage from the right neck

CT of second branchial cleft cyst
Axial (left) CT with contrast of the neck shows a round, low density mass on the right with rim enhancement anterior to the right sternocleidomastoid muscle and inferior to the angle of the mandible and posterior to the right submandibular gland that has a sinus tract to the skin best seen on the coronal CT (right).

The diagnosis was second branchial cleft cyst.