title: Basal cell carcinoma associated with keratoacanthoma.
abstract: This report describes a basal cell carcinoma associated with a keratoacanthoma, showing a histologic transition between the two lesions. Two previously reported cases of basal cell carcinoma are associated with keratoacanthoma, but do not show a transition between the two lesions. The malignant potential of the keratoacanthoma in this case is emphasized.
mesh_terms: D002280:Basal Cell Carcinoma / Q000473:pathology*; D006801:Humans; D007636:Keratoacanthoma / Q000473:pathology*; D008297:Male; D008875:Middle Aged; D009668:Nose Diseases / Q000473:pathology*; D009669:Nose Neoplasms / Q000473:pathology*