Synovial sarcoma is a rare mesenchymal tumor. It occurs predominantly in the extremities especially in the region of the knee. The localization in palm hand is rare. We report a case of a 23 year-old man who present a monophasic synovial sarcoma of the left hand which presented as a painless cystic nodule. A surgical excision was performed. The result was good without recurrence. The synovial sarcoma is a rare malignant neoplasm that should be considered in the differential diagnosis of spindle neoplasms of hand.