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FDG uptake in obturator internus as an indicator of diarrhea.

A 70-year-old man with a history of rectal cancer was examined for recurrence by FDG whole body positron emission tomography (PET). As a result, marked FDG uptake was seen in the perineum. Comparison of the PET image with a CT scan taken 10 days before indicated that the site of FDG uptake was the obturator internus muscle. The patient reported suffering from diarrhea on the day of PET. This case illustrates an unusual pattern of increased FDG uptake in the obturator internus muscle, probably related to contraction because of diarrhea.