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Subdiaphragmatic gallstone mimicking hepatic malignancy on FDG PET/CT
Jisoo Kim1, Alan Siegel, Stephanie P Yen
1From the *Geisel School of Medicine at Dartmouth, Hanover; and †Department of Radiology, Dartmouth-Hitchcock Medical Center, Lebanon, NH.
Abstract:
A 70-year-old man underwent an FDG PET/CT for a possible primary liver malignancy or metastasis found on an abdominal MRI obtained as part of a workup for intermittent abdominal pain. The MRI showed an enhancing lesion at the dome of the right lobe of the liver. The lesion was FDG avid with a discrete central calcification. In conjunction with the patient's history of laparoscopic cholecystectomy 1 year prior, the findings were consistent with inflammation around a migrated subdiaphragmatic gallstone. One month after the scan, a CT-guided percutaneous biopsy of this lesion revealed chronic inflammatory cells with no evidence of malignancy.
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