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Figure 9a. Abscess in a 59-year-old man with a history of Crohn disease who presented with fever, chills, and lower abdominal pain. (a) Axial T2-weighted fast SE image shows a thick-walled fluid collection (arrows) in the left hemipelvis, adjacent to the sigmoid colon (arrowheads). (b) Axial gadolinium-enhanced 3D fat-saturated T1-weighted GRE image obtained during the delayed venous phase shows peripheral rim and septal enhancement of the fluid collection (arrows). The sigmoid colon is again visualized (arrowheads). The diagnosis of an abscess related to Crohn disease was confirmed with percutaneous drainage of the fluid collection.
