Extraskeletal Osteosarcoma of the Thigh: An Autopsy Case Report

الملخص EN

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.