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Deep to the right SCM muscle sternocleidomastoid is a relatively low density ?cystic mass, separate to the parotid gland and carotid sheaths, (20 x 25 x 17 mm) ~20 Hounsfield units.
The mass is well circumscribed and superiorly appear to be a number of branching or tubular structures of similar density, which is atypical for a branchial cleft cyst. No fat stranding seen around the mass.
A couple of lobulated lesions, of somewhat lower density (-20 HU) are seen between the anterior border of SCM and the overlying skin.