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Fig. 12A —42-year-old woman with fecal incontinence after complicated
vaginal delivery (long labor, assisted delivery, rupture). IS = lower part of
internal anal sphincter, TPM = transverse perineal muscle, IAS = ischioanal
space. In transverse T2-weighted fast spin-echo (TR/TE, 2,500/70) external
phased-array MR image, compare structure of scar tissue (black
arrows) with that in B. Note that scar tissue of external anal
sphincter (ES) is more hypointense, with distorted and asymmetric architecture
on endoanal MRI. GM = gluteus muscle.
