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. Author manuscript; available in PMC: 2014 Jan 1.
Published in final edited form as: Radiol Clin North Am. 2013 Jan;51(1):69–88. doi: 10.1016/j.rcl.2012.09.005

FIGURE 3. Flat lesion obscured by densely opacified fluid on soft tissue windows.

FIGURE 3

FIGURE 3

FIGURE 3

FIGURE 3

Prone transverse 2D CTC image with polyp windowing (A) shows a flat cecal polyp (arrowhead), which is submerged under opacified fluid but is nonetheless detectable. On the soft tissue window setting (B), however, the lesion is obscured by the dense surrounding fluid. This windowing phenomenon is also the reason why 2D lesion measurement must take place on the wider polyp window setting. 3D endoluminal CTC image (C) in the supine position shows the flat lesion outlined by air. The lesion was confirmed at subsequent OC (D) and proved to be a tubulovillous adenoma.