爪部扁平上皮癌

・爪部に生じた扁平上皮癌の1例を経験した．

・臨床的に肉芽腫様の外観を呈しており，診断確定に時間を要した．

・組織学的にはBowen病の特徴を有していた．

・骨膜への浸潤を認めたため，拇趾のIP関節離断術を行った．

（「症例のポイント」より）

　

A case of a squamous cell carcinoma of the nail

　

Takeda, Koichiro1）Tamai, Mariko1）Sato, Hiroko1）Yonekura, Kentaro1）Kanzaki, Tamotsu1） 1）Division of Dermatology, Imamura Sogo Hospital

　

We report a 65-year-old man presenting a red nodule on his lateral nail fold of the first toe. At first, it was treated with topical steroid, considering it as foreign body granuloma due to ingrown nail. Although the tumor had shrunk temporarily but then enlarged, a skin biopsy was performed and a diagnosis of SCC was made. Although the tumor was resected including the periosteum, tumor cells also infiltrated the periosteum. We performed an amputation at the IP joint of the right first toe. No recurrence has been observed three years after the operation. SCC in the nail area is a relatively rare tumor, and the clinical features are so diverse that it is often misdiagnosed as a benign disease such as granuloma, and it often takes time to confirm the diagnosis. Therefore, it is considered necessary to perform a histopathological examination actively for the tumor on nail lesion.