A cyst infection was suspected in a patient who was on haemodialysis for renal failure secondary to hepatorenal polycystic disease with persistent fever and pain in right hypochondrium despite antibiotherapy. Radiologic exams (ultrasonography, computed tomography [CT]), however, did not show signs of infection. For surgical removal of the infected cyst, a precise location was required. This report shows how functional imaging, gallium citrate Ga 67 scan, and fluorine F 18 fluorodeoxyglucose (FDG) positron emission tomography (PET) revealed which cyst was infected; however, the fused image provided by PET/CT showed the precise, required location. The infected cyst was located on the right kidney. A week later, after nephrectomy, all symptoms disappeared.
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