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Figure 9


Fig. 9 —Transverse endoanal T2-weighted fast spin-echo (TR/TE, 2,500/70) MR image before surgery at midanal canal in 31-year-old woman after complicated vaginal delivery (breech delivery and rupture) shows defect (thin white arrows) from 10- to 2-o'clock positions and scar tissue (arrowheads) anterior to external anal sphincter (ES). Note discontinuity of sphincter ring, low signal intensity, and disordered architecture. Also, anterior internal anal sphincter (IS) defect is depicted (black arrows) from 9- to 4-o'clock positions, identifiable by discontinuity of anterior part of internal anal sphincter.