Osteosarcoma of the femur mimicking Ewing sarcoma/primitive neuroectodermal tumour on biopsy and metastatic carcinoma on resection

Skeletal Radiology, 05/14/2012

The authors present an osteosarcoma in a 17–year–old girl that was diagnosed as an Ewing sarcoma/primitive neuroectodermal tumour (ES/PNET) on biopsy; however, the resected specimen revealed a very unusual morphology mimicking a metastatic carcinoma with a sex cord stromal tumour–like pattern.

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