title: A basal cell epithelioma on another basal cell epithelioma.
mesh_terms: D002280:Basal Cell Carcinoma / Q000473:pathology*; D002455:Cell Division; D006801:Humans; D008297:Male; D008875:Middle Aged; D009378:Neoplasms, Multiple Primary / Q000473:pathology*; D012878:Skin Neoplasms / Q000473:pathology*; D013997:Time Factors