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Incidental Colonic Fluorodeoxyglucose Uptake: Correlation with Colonoscopic and Histopathologic Findings¹

¹ From the PET Imaging Science Center, Division of Nuclear Medicine, Department of Radiology, Keck School of Medicine, University of Southern California, 2250 Alcazar St, Suite 101, Los Angeles, CA 90033-4609. From the 2000 RSNA scientific assembly. Received July 17, 2001; revision requested September 10; revision received November 2; accepted January 7, 2002. Address correspondence to P.S.C. (e-mail: pconti@.usc.edu).

View larger version (82K): [in a new window]   Figure 1a. Coronal PET images of grade 4 diffuse colonic FDG uptake in (a) a 45-year-old woman and (b) a 69-year-old woman, both with normal findings at colonoscopy. The haustral folds (arrowheads) are clearly delineated in b.

View larger version (78K): [in a new window]   Figure 1b. Coronal PET images of grade 4 diffuse colonic FDG uptake in (a) a 45-year-old woman and (b) a 69-year-old woman, both with normal findings at colonoscopy. The haustral folds (arrowheads) are clearly delineated in b.

View larger version (91K): [in a new window]   Figure 2. Coronal PET image of grade 4 nodular-focal colonic FDG uptake in the hepatic flexure (arrowhead) in a 72-year-old man with a history of lung cancer. At colonoscopy, a 1.7-cm polyp was depicted at this location. Histologic analysis revealed that this polyp was tubulovillous adenoma.

View larger version (88K): [in a new window]   Figure 3. Coronal PET image of incidental grade 4 nodular-focal cecal FDG uptake (arrowhead) in a 74-year-old man with an indeterminate lung nodule. At colonoscopy, a 4-cm mass was depicted at this location. Biopsy results revealed primary colon carcinoma.

View larger version (97K): [in a new window]   Figure 4a. Coronal PET images show grade 4 segmental colonic FDG uptake (arrowhead) in (a) a 61-year-old man referred for evaluation of an indeterminate lung nodule and (b) a 78-year-old woman referred for restaging of lung cancer. At colonoscopy, hemorrhagic colitis was revealed in the patient in a, and biopsy revealed lymphocytic colitis in the patient in b.

View larger version (100K): [in a new window]   Figure 4b. Coronal PET images show grade 4 segmental colonic FDG uptake (arrowhead) in (a) a 61-year-old man referred for evaluation of an indeterminate lung nodule and (b) a 78-year-old woman referred for restaging of lung cancer. At colonoscopy, hemorrhagic colitis was revealed in the patient in a, and biopsy revealed lymphocytic colitis in the patient in b.