title: An unusual variant of squamous cell carcinoma (inverted verrucous carcinoma) arising in a pilonidal sinus.
mesh_terms: D002291:Carcinoma, Papillary / Q000175:diagnosis / Q000473:pathology*; D002294:Carcinoma, Squamous Cell / Q000175:diagnosis / Q000473:pathology*; D003937:Diagnosis, Differential; D006801:Humans; D008297:Male; D008875:Middle Aged; D010864:Pilonidal Sinus / Q000175:diagnosis / Q000473:pathology*