Second branchial cleft cyst
The patient noticed a painless swelling in her right neck about 10 weeks ago.
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A sharply delineated T2-hyperintense cyst at the level of the right carotid bifurcation without contrast enhancement. It is located between the anterior border of the right sternomastoid posteriorly, posterior aspect of the right submandibular gland anteriorly and the carotid sheath medially.
Imaging features and location of the cystic lesion is in keeping with a non-complicated second branchial cleft cyst.