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Fig. 4A —53-year-old woman after complicated vaginal delivery (rupture).
Transverse endoanal sonogram (A) and transverse endoanal T2-weighted
fast spin-echo MR image (B) (TR/TE, 2,500/70) at mid distal anal canal
show sphincter overlap (thin arrows) of both external anal sphincter
ends, left over right, after anterior anal sphincter repair and continuity of
sphincter ring has been restored. Although appearances at endoluminal imaging
show overlap, surgery failed for this patient because patient was still fecal
incontinent. Top of both images is anterior. LIS = lower edge of internal anal
sphincter, ES = external anal sphincter.
