title: Invasive basal cell carcinoma with metaplastic bone formation associated with a long-standing dermatofibroma.
abstract: A nodule present for many years on the right leg of a 77-year-old woman was excised and studied by light microscopy. An invasive keratinizing basal cell carcinoma associated with metaplastic bone formation, arising within a dermatofibroma, was found.
mesh_terms: D000368:Aged; D002114:Calcinosis / Q000473:pathology; D002280:Basal Cell Carcinoma / Q000473:pathology*; D005260:Female; D005350:Fibroma / Q000473:pathology*; D006801:Humans; D008679:Metaplasia; D009999:Ossification, Heterotopic / Q000473:pathology*; D012878:Skin Neoplasms / Q000473:pathology*