A case of adenoid cystic carcinoma of the lower gingiva

Adenoid cystic carcinomas (ACC) often occur in glands. The major and minor salivary glands in the palate, oral floor, and buccal mucosa are a common site for this tumor in the mouth. ACC is extremely rare in the gingiva because of scanty salivary glands. We describe a patient with ACC arising in the lower gum. A 47-year-old man presented with healing failure after extraction of 3 5. A clinical examination revealed gum swelling associated with periodontitis in the region from 2 to 7 and hyperplasia of granulation tissue. Pathological findings of the biopsy specimen were ACC. The patient underwent mandiblectomy with elective neck dissection. He is free from tumor 37 months after the operation.