Objective:To study the X-ray

CT and MRI features of synovial sarcoma and improve the understanding of synovial sarcoma imaging features. Methods: The X-ray

CT and MRI findings were retrospectively reviewed in 17 patients with synovial sarcoma proved by operation and pathology. Results: 13 cases occurred in lower or upper extremities

3 cases in body

1 case in left lung. On X and CT imaging

the density of lesion was heterogeneous

with 4 cases demonstrating peripheral mass calcification

3 cases showing bone destruction

and 4 cases showing bone resorption. On T1WI

three cases were usually homogeneous with signal intensity similar to or slightly higher than that of muscles and on T2WI they presented prominent homogeneous with high signal intensity. On T1WI and T2WI/STIR

8 cases presented slightly hyperintense “cobble” nodules

with hypointense septa among the nodules. After contrast

the nodules were unenhanced or enhanced slightly

and the septa were markedly enhanced. Conclusion: Synovial sarcoma have some characteristic findings. The characteristics of synovial sarcoma can be better displayed by combing the X-ray

CT and MRI

and the qualitative and differential diagnosis can thus be improved.