title: Subdiaphragmatic gallstone mimicking hepatic malignancy on FDG PET/CT.
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.
authors.affiliation: From the *Geisel School of Medicine at Dartmouth, Hanover; and †Department of Radiology, Dartmouth-Hitchcock Medical Center, Lebanon, NH.
authors.forename: Jisoo
authors.initials: J
authors.lastname: Kim
authors.forename: Alan
authors.initials: A
authors.lastname: Siegel
authors.forename: Stephanie P
authors.initials: SP
authors.lastname: Yen
authors.forename: Marc
authors.initials: M
authors.lastname: Seltzer
mesh_terms: D000368:Aged; D002277:Carcinoma / Q000000981:diagnostic imaging*; D005189:False Positive Reactions; D019788:Fluorodeoxyglucose F18; D042882:Gallstones / Q000000981:diagnostic imaging*; D006801:Humans; D008113:Liver Neoplasms / Q000000981:diagnostic imaging*; D008297:Male; D064847:Multimodal Imaging; D049268:Positron-Emission Tomography; D019275:Radiopharmaceuticals; D014057:Tomography, X-Ray Computed
chemical_list: D019275:Radiopharmaceuticals; D019788:Fluorodeoxyglucose F18