Branchial cleft cyst
Long-standing indolent left lateral neck mass.
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A well-defined cystic lesion in the left side of the neck deep to the left sternomastoid muscle with clear fluid content and a thin enhancing wall. It is lateral to the carotid sheath and posterior to the left submandibular gland.
Imaging findings of a neck cystic lesion with the classic location for a second branchial cleft cyst. No signs of infection or complications identified.