Fig. 21
From: Endometriosis: clinical features, MR imaging findings and pathologic correlation
Endometriosis of the rectal wall in a 45-year-old woman with cyclic hematochezia, constipation, pencil-like stools and episodes of intestinal subocclusion, who underwent previous right ureteral stenting. (a) Sagittal and (b) oblique coronal T2-weighted images, and (c) sagittal and (d) oblique coronal contrast-enhanced fat-suppressed T1-weighted images show an endometriotic lesion (white arrows) infiltrating the muscular and submucosal layers of the rectal wall. The lesion extends longitudinally for about 7 cm and determines severe stenosis. Note the hyperintense signal of the (sub)mucosal layer protruding into the rectal lumen (black arrowheads in a and b). (e) Photomicrograph (H&E 25X). Endometriosis in submucosa (black *) and in muscularis propria (white *)