Fig. 8
From: What is hiding in the hindgut sac? Looking beyond rectal carcinoma
Mantle cell lymphoma in a 58-year-old man presenting with rectal bleeding and tenesmus.a Coronal, b axial and c sagittal contrast-enhanced CT reveal a long segment of marked circumferential wall thickening (arrow) involving the rectum with multiple polypoidal intraluminal projections. There is aneurismal dilatation of the rectum with extensive retroperitoneal lymphadenopathy (arrowhead)