Early Dynamic FDG and PET/CT Scans to Localize Cystovaginal Fistula

Abstract

The high activity concentration of F-18 fluoro-2-deoxyglucose (FDG) accumulated in the bladder, at standard scanning time of 60 minutes postinjection or more, renders detection of subtle abnormalities difficult in or around this organ. To minimize the effect of high activity concentration of FDG on the bladder or its surrounding, we used early dynamic FDG and PET/CT scans on a 69-year-old woman to identify the location of her cystovaginal fistula. The dynamic scans were obtained in frames of 2 minutes each starting at injection time and lasting 10 minutes. The dynamic images revealed a small fistula extending from the posterior medial left side of the bladder to the anterior left side of the vagina.