Carcinoma epidermoide sobre sinus pilonidal

introduction: malignant degeneration of pilonidal sinus is a rare complication observed mainly in recurrent chronic cases of the disease, associated to a very bad prognosis. material and methods: we have reviewed 367 patients with simple and complicated pilonidal cysts. we found 3 cases (0.81%) of epidermoid carcinoma. conclusions: pilonidal sinus epidermoid carcinoma is an infrequent disease predicting for very poor outcome.