title: Cutaneous extraskeletal osteosarcoma on the scar of a previous bone graft.
abstract: Extraskeletal osteosarcoma (ESOS) is a very rare malignant tumor of mesenchymal origin. It is rarer than osseous osteosarcoma and there are very few reports of the skin being a primary site. Most reported cutaneous ESOS were accompanied with metastasis in other organs. A 56-year-old man presented with a painful, 1.5×0.8 cm sized, brown-colored nodule on the right girdle area for 3 months. The histologic findings revealed a tumor that was confined to the dermis without connection to the subcutaneous tissue. In addition, there were large amounts of thin and lace-like bony trabeculae and osteoid with neoplastic cells in a highly pleomorphic sarcomatous stroma.
authors.affiliation: Department of Internal Medicine, Hemato-oncology, School of Medicine, Chosun University, Gwangju, Korea.
authors.forename: Sang Gon
authors.initials: SG
authors.lastname: Park
authors.forename: Ji Young
authors.initials: JY
authors.lastname: Song
authors.forename: In Guk
authors.initials: IG
authors.lastname: Song
authors.forename: Min Sung
authors.initials: MS
authors.lastname: Kim
authors.forename: Bong Seok
authors.initials: BS
authors.lastname: Shin