title: Extraskeletal osteosarcoma of the thigh: an autopsy case report.
abstract: We report a case of extraskeletal osteosarcoma (ESOS) and autopsy findings. A 35-year-old man presented with an ossified tumor in the right thigh and lung metastasis. The lung tumors continued to develop despite multiagent chemotherapy and caused death within 8 months. Autopsy revealed many secondary lesions in the lungs, especially in the left lung. Histopathologically, the primary tumor and one of the secondary tumors showed proliferation of spindle-shaped tumor cells focally forming lace-like osteoid material. Therefore, we made a definite diagnosis of ESOS.
authors.affiliation: Department of Orthopaedic Surgery, Graduate School of Medicine, Gifu University, 1-1 Yanagido, Gifu 501-1194, Japan.
authors.forename: Akihito
authors.initials: A
authors.lastname: Nagano
authors.forename: Takatoshi
authors.initials: T
authors.lastname: Ohno
authors.forename: Yutaka
authors.initials: Y
authors.lastname: Nishimoto
authors.forename: Kazunari
authors.initials: K
authors.lastname: Yamada
authors.forename: Katsuji
authors.initials: K
authors.lastname: Shimizu