A hernia into the intersigmoid fossa on the under surface of the root of the mesosigmoid near the inner border of the psoas magnus muscle. ... (05 Mar 2000) ... 
herniation of intestine through the intersigmoid fossa.
Type: Term Definitions: 1. a hernia into the intersigmoid fossa on the under surface of the root of the mesosigmoid near the inner border of the psoas magnus muscle.