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Anterior Layering of Excreted 18F-FDG in the Bladder on PET/CT: Frequency and Cause

¹ All authors: Department of Radiology, University of California, San Francisco, Box 0628, M-392, 505 Parnassus Ave., San Francisco, CA 94143-0628.

OBJECTIVE. The objective of our study was to determine the frequency and cause of anterior layering of excreted ¹⁸F-FDG in the bladder on PET/CT.

CONCLUSION. Anterior layering of excreted FDG in the bladder is commonly seen on PET/CT scans obtained with IV iodinated contrast material and is due to displacement of FDG by excreted iodinated contrast material; this phenomenon may unmask FDG-avid bladder disease.

Keywords: bladder cancer • bladder neoplasm • contrast media • FDG PET • image artifacts • oncologic imaging • PET/CT

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