CT - CT neck
A well-defined left neck cystic lesion exhibits near-water density with an enhancing wall of non-uniform thickness, measuring 4.5 x 4.2 x 5.2 cm. Laterally, the lesion is in intimate relation to the left sternomastoid muscle, inseparable from its medial wall. Anteriorly, it is indenting the posterior surface of the left submandibular gland. Medially, it is related to the carotid sheath with compression and caliber attenuation of the left internal jugular vein. Multiple bilateral reactive cervical lymph nodes are noted. The ipsilateral parotid gland is of normal CT features.