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Extrinsic compression. (a, b) Endoluminal 3D (a) and corresponding magnified axial 2D (b) CT colonography images show a CAD polyp candidate (arrow in b). On the endoluminal view, this polyp candidate is difficult to disregard and measures approximately 7 mm in its maximal diameter. However, the axial view shows that an external structure, a right iliac vessel, is adjacent to the bowel wall and is extrinsically compressing the sigmoid colon lumen.
