顎下腺に発生した基底細胞腺腫の1例

Abstract

Basal cell adenoma （BCA） was added to the classification of salivary gland tumors by the WHO in 1991. BCA occurs most frequently in the parotid glands, and BCA of the submandibular glands is relatively rare. We report our experience with BCA arising in the submandibular gland. A 73-year-old man was referred to our department because of a swelling in the right submandibular region. Physical examination revealed a round, hard mass, about 35 mm in diameter, in the submandibular region. On CT, MRI, and US studies, we found a well-circumscribed mass. On the basis of clinical findings, the diagnosis was a benign tumor of the right submandibular gland. Under general anesthesia, resection of the right submandibular gland was performed. Histopathologically BCA is classified into four types: tubular type, trabecular type, and membranous type, and solid type. The most common is solid type. The present case was solid-trabecular mixed type.On postoperative follow-up for 12 months, the patient has remained well without any further abnormal findings or signs of tumor recurrence on clinical examinations to date.