Generally, the classification of rhabdomyosarcomas of WHO is used today and these rhabdomyosarcomas are distinguished by the difference between the form of the histological character. The case of an 85-year-old woman who developed right hip swelling is reported. The tumor of this case is less pleomorphic than pleomorphic type of the rhabdomyosarcoma and relatively immature myoblasts are predominant. We recognize this tumor arising form muscle cells form those originating in the skeletal muscle by electrone and light microscopy. According to the fact that was mentioned earlir and also to the examination of the literature, we may diagnose this case as the malignant tumor in soft tissue which shows the form of so called malignant blastoma.
