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Fig. 3A —15-mm sessile tagged feces in descending colon in 59-year-old
woman without colorectal polyp or mass. Transverse images of 72-second delay
IV contrast-enhanced CT colonography with dietary fecal tagging in supine
position at wide window setting (width, 1,500; level, –400 H) (A)
and at soft-tissue window setting (width, 400 H; level, 20 H) (B) show
sessile homogeneously high-attenuating lesion (arrow) in descending
colon that was interpreted as tagged feces. Attenuation value of tagged feces
was 495 H, which was lowest attenuation value among 41 tagged feces. At
blinded review, all four reviewers correctly interpreted tagged feces.
