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Fig. 4A —8-mm tubular adenoma of transverse colon in 67-year-old man.
Transverse images of 72-second delay IV contrast-enhanced CT colonography in
supine position at wide window setting (width, 1,500 H; level, –400 H)
(A) and at soft-tissue window setting (width, 400 H; level, 20 H)
(B) show sessile lesion (arrow) with attenuation value of 114
H in transverse colon. At blinded review, this polyp was misinterpreted as
tagged feces by experienced reviewer who misinterpreted lesion attenuation at
soft-tissue window (B) as artificially high (i.e., tagging agent).
