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Fig. 1. —37-year-old woman with heme-positive stools. Overhead
radiograph from double-contrast barium enema obtained with patient prone and
gantry angled was initially interpreted as showing no rectal or sigmoid polyp.
Second reader saw 6-mm pedunculated rectal polyp (arrow), finding
with which first reader then agreed. Results of subsequent colonoscopy were
negative. This example illustrates conversion of true-negative to
false-positive reading with addition of second reader.
