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Rectal carcinoma with spread to the internal iliac chain lymph nodes. (a) There is an abnormally enhancing iliac lymph node (arrow) on contrast-enhanced CT. (b) There is avid radiotracer uptake (arrow) on the right side of the pelvis on FDG-PET (arrow). (c) Increased uptake on FDG-PET (arrow) correlates with the lymph node lesion seen on CT and is consistent with a malignant deposit.
