What is the differential diagnosis for this lesion?
Left parotid mass most likely represents a Warthin tumour, but other parotid neoplasms (pleomorphic adenoma, mucoepidermoid and adenoid cystic carcinoma, metastatic SCC) are not excluded.
Sharply circumscribed left parotid mass contains small cystic areas and a single coarse focus of calcification.
No other left parotid lesion identified.No abnormal soft tissue density or expansion of the pterygopalatine fossae, stylomastoid foramina or foramina ovale.
Previous right retrosigmoid craniectomy and right parietal ventriculoperitoneal shunt noted.