A Case of Accessory Parotid Cyst Treated with Ultrasound-Guided Percutaneous Ethanol Injection

Abstract

A cyst in the accessory parotid gland (APG) is extremely rare, with only three cases having been reported recently in English literature. They were all treated with sclerotherapy, where a cyst may appear as a painless superficial mass in the mid-cheek area. In sclerotherapy, the most commonly used materials are ethanol and OK-432, which report good therapeutic results for the treatment of benign cervical cystic mass. An 85-year-old man came to our clinic with superficial, well-margined ovoid mass on the left cheek. The mass was diagnosed as a benign cyst in APG through imaging studies and core needle biopsy. We performed the ultrasoundguided percutaneous ethanol injection and the cyst disappeared, leaving only the fused cystic wall. We report this very rare and interesting case with a literature review.