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Fig. 3B —Midsagittal contrast-enhanced T1-weighted spoiled gradient-recalled echo MR images (TR/TE, 22.4/10.7) obtained in 47-year-old woman in sitting position at end of defecation. When ultrasound gel is used, rectocele (arrow) is smaller (20 mm) when potato starch is used (A). Visibility of intrarectal intussusception (arrowheads) is similar using both rectal compositions, but thickness is measured greater when using potato starch than when using ultrasound gel as rectal enema (anterior thickness, 12 vs 10 mm, respectively; posterior thickness, 22 vs 17 mm). In addition, severe rectal descents are clearly seen using both rectal enema compositions.