A 50-year-old man with a submental mass.

A 50-year-old man with a history of submental mass since childhood presented with increased swelling of the mass and discomfort with swallowing. Ultrasound-guided fine needle aspiration and histological biopsy were non-diagnostic. Computed tomography (CT) of the neck was performed. Noncontrast CT demonstrated soft tissue swelling in the submental region and a unilocular cystic mass with smooth margins in sublingual space (Fig 1). Multiple homogeneous, hypoattenuating fluid material were seen inside. No calcification was noted (Fig 2). Contrast-enhanced CT demonstrated enhancement of the wall of the cystic sublingual mass (Fig 3). Based on the coronal images, the cystic mass appeared to be in the sublingual space superior to the mylohyoid muscle (Fig 4). Collectively, these radiographical features were suggestive of a dermoid or epidermoid cyst.