口底部に発生した変性型神経鞘腫の1例

• Published in: 日本口腔外科学会雑誌 Vol. 62; no. 3; pp. 110 - 114
• Main Authors: 大亦, 哲司, 福山, 瑛子, 森田, 祥弘, 森田, 展雄, 木本, 奈津子, 木本, 栄司
• Format: Journal Article
• Language: Japanese
• Published: 社団法人 日本口腔外科学会 20.03.2016
• Subjects: 囊胞形成; 変性型神経鞘腫; 硝子質化; 神経鞘腫
• ISSN: 0021-5163; 2186-1579
• DOI: 10.5794/jjoms.62.110

Schwannoma is a rare benign tumor arising in the head and neck region. Many schwannomas occurring in the oral cavity are relatively small, and nearly all reports have described tumors less than 20-30 mm in diameter. Schwannomas tend to undergo secondary changes such as cyst formation, hemorrhage, hyalinization, and mucoid deposition over a prolonged period. Some schwannomas display marked nuclear atypia and are referred to as ancient schwannomas. This report describes a hypervascular ancient schwannoma more than 40 mm in diameter that arose from the floor of the mouth. The tumor was located on the side of oral floor inside the mylohyoid muscle. The tumor displaced this muscle inferiorly, resulting in marked swelling of the submandibular region, but little swelling of the floor of the mouth. The tumor was surgically removed using an extraoral approach, because of the high risk of bleeding and marked swelling of the submandibular region. No signs or symptoms of recurrence have been noted as of 4 years postoperatively.