A 70-year-old man with a history of autosomal dominant polycystic kidney disease was referred for F-FDG PET/CT scans twice at 6-month intervals due to repeated fever with negative conventional imaging studies. The FDG PET/CT scans revealed different hepatic cyst lesions in the 2 scans, with a large infected cyst in the second study. After aspiration and intravenous antibiotics treatment, the patient was discharged and remained uneventful thereafter for 6 months.
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