The described CT features are of a right neck cystic lesion consistent with infected second branchial cleft cyst type II which is the most common type of this congenital anomaly. Classically, it is located at the anteromedial border of the sternocleidomastoid muscle, lateral to the carotid space, and at the posterior margin of the submandibular gland, related to the angle of the mandible. The location can be anywhere from the pharyngeal wall to the skin along the course of the second branchial apparatus.

FNA gross examination: 30 mL of creamy turbid fluid aspirate.

Microscopic examination: Smears revealed benign lymphoepithelial pyogenic aspirate mainly composed of benign epithelial cysts admixed with few lymphocytes, neutrophils and histiocytes. No malignant cells.