Adenoid cystic carcinoma of accessory parotid gland: A case report and review of the literature

Accessory parotid gland (APG) is a small salivary gland tissue ranging from 0.5 to 1 cm diameter in size, located almost 7 mm anterior to the main parotid gland. APG is a common anatomical variant, but accessory parotid gland tumors are very rare, accounting for only 1%–7.7% of all parotid gland tumors. We present a case of adenoid cystic carcinoma involving accessory parotid gland, a very rare condition with only, to the best of our knowledge, other 7 cases described in literature. Surgical excision was performed and eventful postoperative recovery, without severe surgical complications and no signs of recurrence at 12 months of follow-up was obtained, with a good cosmetic result. An extensive review of the literature has been performed and the results are presented in order to establish a correct diagnostic-therapeutic protocol for these oncologic patients