Coronal T1, axial T1, and fat sat axial T2 images demonstrate a large, thin walled
mass inferior to the left mandibular angle. Its contents follow fluid on all pulse
sequences, with a thin septation evident. The mass extends between the
sternocleidomastoid and the carotid space, displacing the former posteriorly and
laterally and the latter medially.
Postcontrast images show that the mass has a thin enhancing rim and elevates the
left submandibular gland.
Key words: mr mri neck cyst mass developmental
Branchial cleft cyst