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Fig. 3A —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 healthy 20-year-old woman shows anterior
portion of anal canal. Internal anal sphincter (IS) is prominent hypoechoic
layer.
