Fig. 16
From: What is hiding in the hindgut sac? Looking beyond rectal carcinoma
Rectal endometriosis. a Sagittal T2-weighted MRI reveals a hypointense spiculated irregular mass (arrow) along the anterior surface of the mid rectum. b Sagittal T1-weighted MRI reveals this fibrous deposit to be intermediate signal intensity. c Sagittal fat-suppressed T1-weighted MRI demonstrates tiny hyperintense foci (arrowhead) within the endometriotic deposit (arrow). d Axial T2-weighted MRI reveals the irregular spiculated hypointense lesion (arrow) with a few tiny hyperintense foci