PRIMARY CUTANEOUS OSTEOSARCOMA

A 78-year-old man had a 1-cm cutaneous nodule on his shoulder; subsequ ent excisional biopsy showed osteosarcoma. There was no connection to deeper structures, and no primary bone lesion was found. The tumor rec urred at the same site 9 months after diagnosis and was reexcised. We believe this to be the first well-illustrated case of primary cutaneou s osteosarcoma, which should now be included on the list of sarcomas t hat may occur in the skin.