拇指爪下外骨腫

・手指に生じた爪下外骨腫を経験した．

・手術方法としては，手指という点から整容的な面も考慮し，視野確保がむずかしいとされる指尖部を横切開する腫瘍部切開法を選択したが，爪変形もなく予後良好であった．

・術中の単純X線検査で腫瘍の取り残しがないことを確認することが再発を防ぐために肝要と考えた．

（「症例のポイント」より）

　

A case of subungual exostosis of the thumb

　

Kawasaki, Yurika1）Fukuyasu, Atsuko1）Ishikawa, Takeko1）Kamata, Masahiro1）Ohnishi, Takamitsu1） Kondo, Fukuo2）Tada, Yayoi1） 1）Department of Dermatology, Teikyo University School of Medicine 2）Department of Pathology, Teikyo University School of Medicine

　

A 54-year-old female presented with a nodule with tenderness on the tip of the right thumb for the past one year. She had no history of trauma. The lesion was pinkish, keratinized, bone-like hard and poorly movable. X-ray of the hand revealed mature bone projecting from the distal end of the terminal phalanx of the right thumb. Histopathology from excised tissue from the lesion (thumb)showed evidence of mature trabecular bone with a fibrocartilaginous cap in the deep dermis. No recurrence at the postoperated site has been observed for about five years up to now.