Xanthogranulomatous cholecystitis mimicking gallbladder carcinoma with a false-positive result on fluorodeoxyglucose PET

Figure 1 Abdominal ultrasonography showed an irregular thickening of the gallbladder wall on the hepatic side. No gallstones were detected.

Figure 2 Abdominal computed tomography (CT) and fluorine-18 fluorodeoxyglucose positron emission tomography (FDG-PET). A, B: Abdominal CT scan revealed an irregular thickening of the wall of the gallbladder body on the hepatic side. The border between the thickened gallbladder wall and liver parenchyma was indistinct; C, D: FDG-PET/CT scan showed increased activity in the thickened wall of the gallbladder. The increased uptake area appeared to extend into the liver parenchyma.

Figure 3 Cut surface of the specimen. A yellowish tumor about 2 cm in diameter was observed between the mucosa of the body of the gallbladder and the liver parenchyma in the cut specimen.