-Case Reports-

Relationship between Tumor Diameters and Antoni Classification for Schwannoma of the Lower Lip

Yuusuke Fujiwara^1,2, Sohichi Aizawa^2,3, Hisao Ogawa², Atsushi Mamiya², Kenta Shinoda² and Hisataka Kitano^1-3

¹Dentistry and Oral Surgery, Aomori Shintoshi Hospital, Aomori, Japan
²Division of Oral Surgery, Nihon University School of Medicine, Tokyo, Japan
³Dentistry and Oral Surgery, Yokohama Chuo Hospital, Kanagawa, Japan

Schwannoma is an uncommon benign tumor in the oral and maxillofacial region, and development of schwannoma in the lower lip is rare. Herein, we present the case of a 68-year-old woman who visited Nihon University Itabashi Hospital complaining of a painless mass in the lower lip. The lesion was surgically resected under local anesthesia. On histopathological examination, the resected specimen was a mixture of Antoni types A and B schwannoma. No recurrence has been seen over a postoperative follow-up period of 58 months. In the schwannoma of the lower lip, the mean tumor volume was compared for type A and the mixed type, which tended to be larger in the mixed type. No previous reports have described the relationship between the size of schwannoma in the lower lip and Antoni classification. Therefore, this report discusses the possibility of a relationship between tumor size and Antoni classification for schwannomas in the lower lip.

J Nippon Med Sch 2022; 89: 629-633

Keywords
Antoni classification, lower lip, schwannoma

Correspondence to
Hisataka Kitano, Division of Oral Surgery, Nihon University School of Medicine, 30-1 Oyaguchikamicho, Itabashi-ku, Tokyo 173-8610, Japan
kitano.hisataka@nihon-u.ac.jp

Received, July 1, 2021
Accepted, September 15, 2021