Cystic lesion deep to left SCM. There is a well-defined mass in the left neck deep to the sternocleidomastoid muscle that measures up to 5 cm. The lesion demonstrates high T1 and low T2 signal and has smooth, thin peripheral enhancement. There are no flow voids or signs of phleboliths within the lesion. The cervical lymph nodes are not particularly enlarged. The thyroid and salivary glands are unremarkable. There is a left maxillary sinus retention cyst. The imaged intracranial structures and orbits are unremarkable. The osseous structures appear to be intact.
A well-defined cystic lesion deep to the left sternocleidomastoid muscle inferior to the level of the mandibular angle, which measures up to 5 cm, may represent a second branchial cleft cyst. 