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A, Sagittal true fast imaging in steady-state free precession image
obtained during proctographic phase of dynamic MR imaging. Image shows open
anal canal (white arrow) indicating that rectal evacuation is
occurring. Rectocele (r) size is measured as maximal anterior extension
(arrowed line) perpendicular to line extending upward from anterior
margin of anal canal (black line).
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Fig. 3. 74-year-old woman with difficulty emptying rectum and stress urinary
incontinence.