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Fig. 6D —Examples of false-negative lesions by computer-aided
detection (CAD). Note 7-mm pedunculated polyp in distal rectum. On axial 3D
endoluminal (right lower corner) CT colonography image of prone view,
polyp (arrow) was not identified by CAD algorithm. Polyp is located
in narrow space where rectal wall and rectal tube are attached, so shape of
polyp is seen as flat even though original shape of lesion is pedunculated.
Colonoscopic biopsy confirmed adenomatous polyp (not shown).
