Squamous cell carcinoma developing in a pilonidal sinus.
D002294:Carcinoma, Squamous Cell / Q000150:complications* / Q000601:surgery; D006801:Humans; D008875:Middle Aged; D010864:Pilonidal Sinus / Q000150:complications* / Q000601:surgery; D012878:Skin Neoplasms / Q000150:complications / Q000601:surgery