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Fig. 4. Endoanal axial three-dimensional proton
densityweighted gradient-echo MR image obtained in 42-year-old woman
with previous obstetric trauma shows low anovaginal fistula (arrows)
partly fluid-filled (hyper-intense) and partly fibrous or collapsed
(hypointense). External sphincter (E) and anterior external sphincter defect
(curved arrows) are also visualized.