1 | INTRODUCTION
Synovial sarcoma is a relatively rare soft tissue malignancy, accounting for about 10% of primary soft tissue sarcomas[1]. The occurrence of the disease is mostly located around the proximal joints of the limbs, some of which occur in the head, face and viscera. Multiple metastases other than lung and bone are rare[2]. Today, more than half of the patients live for more than 5 years after treatment[3]. However, a few patients progress rapidly, even almost without treatment opportunity.