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Fig. 3D —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. Rotating transducer by 90° from position in C
shows anal sphincter in longitudinal view. Anal verge is on right and
anorectal junction (arrow) on left of image. Internal anal sphincter
(IS) appears as two longitudinal substantial hypoechoic bands.
