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Fig. 16B. —Rectal wall. In vivo axial T2-weighted fast spin-echo image of rectum in 42-year-old woman with rectal adenocarcinoma (A) and photograph of corresponding histologic section (B, H and E) show layers of rectal wall. Mucosa (short straight arrow) displays low signal intensity, and submucosa (long straight arrow) displays high signal intensity. Muscularis propria (curved arrows), comprising inner circular and outer longitudinal muscle, has low signal intensity.