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Fig. 7 —80-year-old woman with intermittent right upper quadrant abdominal pain, proven to represent chronic cholecystitis after cholecystectomy. Axial contrast-enhanced CT image shows gallbladder wall thickening and adjacent hepatic hyperenhancement, prospectively thought to represent acute cholecystitis. Subsequent hepatobiliary scintigraphy (hepatoiminodiacetic scan) was negative for acute cholecystitis, as the gallbladder filled with radiotracer.