Objective:

To discuss the CT manifestations of primary intra-abdominal synovial sarcoma (SS).

Methods:

The CT manifestations of 2 cases with pathology proved primary intra-abdominal SS were retrospectively analyzed and the literatures were reviewed.

Results:

Two cases of SS were located in the retroperitoneum and the greater omentum

and the sizes were 12 cm 13 cm18 cm and 5 cm7 cm6 cm. The boundary was clear and the density was uneven. The CT value was 13-54 Hu. There were hemorrhage

cystic degeneration

abdominal and pelvic effusion. The enhanced scan is obviously uneven and the delayed scan tends to be uniform.

Conclusion:

SS of abdominal cavity is very rare tumor. Certain characteristic CT manifestations could be shown

mostly manifested as a deep and large lobulated soft tissue masses with clear boundaries. Hemorrhage

necrosis and cystic degeneration are common in the masses. Uneven as well as delayed uniform enhancement are assessed after enhanced scan. Abdominal and pelvic cavity effusion is often combined

and no enlarged lymph node is found in abdominal and pelvic cavity. CT examination will help to locate the tumor and observe the relationship between the tumor and surrounding tissues and structures.