下唇に生じた内反性導管乳頭腫の1例

• Published in: 日本口腔外科学会雑誌 Vol. 66; no. 8; pp. 388 - 391
• Main Authors: 宗像, 花楠子, 長谷川, 稔洋, 河合, 繁夫, 小川, 千晴, 大山, 定男, 山内, 智博
• Format: Journal Article
• Language: Japanese
• Published: 社団法人 日本口腔外科学会 20.08.2020
• Subjects: 乳頭状唾液腺腺腫; 内向性導管乳頭腫; 導管内乳頭腫
• ISSN: 0021-5163; 2186-1579
• DOI: 10.5794/jjoms.66.388

Inverted ductal papilloma is a rare benign tumor that occurs in the oral cavity and arises from minor salivary gland ducts. In 1982, White et al. first introduced the term “inverted ductal papilloma”. Now, these neoplasms and intraductal papilloma have been classified as subtypes of ductal papilloma in the WHO classification since 2017. We herein report a case of inverted ductal papilloma of the left lower lip showing atypical macroscopic findings that made diagnosis difficult. The patient was 65-year-old man who was referred to our department for a lower lip mass. He had noticed it more than 10 years ago, but had not previously received any diagnosis or treatment. The mass was 20 mm in diameter. Biopsy specimens revealed papillary proliferation of non-atypical squamous cells with mucous cells. A definite diagnosis was difficult on the basis of these findings. Therefore, he received tumor resection under general anesthesia. The histopathological diagnosis was inverted ductal papilloma. There has been no recurrence during 1 year and 6 months after operation.