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Fig. 4. —Improved biopsy localization information: Select images from
PET/CT study patient with a history of colorectal cancer and rising
carcinoembryonic (CEA) levels. Images show a focal abnormality on PET images
that appears to correlate to "stable" presacral mass on CT.
Inspection of fused image shows only small portion of mass to be
hypermetabolic (arrows), which led to more focused CT-guided biopsy
proving recurrent adenocarcinoma.
