A case of primary synovial sarcoma of the gastrocolic ligament is repo
rted in a 37-year-old woman. CT showed an encapsulated intraabdominal
cystic tumour with an amorphous solid component. Barium studies showed
a mass at the gastrocolic ligament which elevated the gastric antrum
and displaced the transverse colon downwards. This is the first report
of synovial sarcoma formation in the gastrocolic ligament. This tumou
r may have originated from pluripotential mesenchyme.