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Fig. 1A —51-year-old man with mucinous adenocarcinoma arising from fistula in ano. Sagittal T2-weighted fast spin-echo MR image (TR/TE, 4,020/118; echo-train length, 15; 300 x 300 mm field of view; 512 x 512 matrix; 8-mm section thickness; 1.6-mm intersection gap) shows markedly hyperintense heterogeneous content (arrows) within mass.