[Synovial sarcoma in child -- case report].

Soft tissue tumors occur rarely and account for 7 to 10% of all malignant neoplasms in children under 15 years of age. They constitute a heterogeneous group of tumors arising from primitive mesenchymal tissue. According to their origin they are classified as rhabdomyosarcomas and non-rhabdomyosarcomas of soft tissues. Synovial sarcoma is a rare fibroblastic tumor of soft tissue. In children under 5 years it is found only exceptionally. This study reports on a synovial sarcoma localized on the right lower extremity in a boy aged 4 years and 5 months. Differential diagnosis, prognostic factors and the role of imaging methods are discussed.