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Figure 11


Fig. 10B —53-year-old woman after complicated vaginal delivery (rupture). ES = external anal sphincter, IS = internal anal sphincter. Transverse endoanal T2-weighted fast spin-echo (TR/TE, 2,500/70) MR image shows defect of anterior external anal sphincter (arrowheads) and internal anal sphincter (thin arrows) from 11- to 1-o'clock positions by discontinuity of outer and inner sphincter rings. High intrinsic contrast resolution makes delineation of external anal sphincter boundaries clearly visible. Because of severe fecal incontinence, patient underwent surgery. IAS = ischioanal space, VI = vaginal introitus.