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Fig. 3E —Sonography of normal anal canal in three patients. A and B are transanal scans obtained with biplane 9-MHz transducer, C and D were obtained on curved transducer, and E and F were obtained at anorectal junction with traditional end-fired transvaginal probe. Axial image of lower rectum of healthy 56-year-old woman shows prominence of submucosa as broad echogenic layer. Muscularis propria (arrows) surrounds gut and is thin and hypoechoic.