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Mucinous urachal adenocarcinoma: A potential nonfluorodeoxyglucose-avid pitfall on18fluorine-fluorodeoxyglucose positron emission tomography/computed tomography

 Department of Radiology, Memorial Sloan Kettering Cancer Center; Department of Radiology, Weill Cornell Medical College, New York, USA

Correspondence Address:
Jeeban Paul Das,
Department of Radiology, Memorial Sloan Kettering Cancer Center, New York
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/wjnm.WJNM_60_19

Mucinous adenocarcinoma of the urachal remnant is a nonurothelial malignancy that may be asymptomatic until locally advanced or metastatic. We describe a 37-year-old woman with invasive ductal breast carcinoma who underwent18Fluorine-fluorodeoxyglucose (18F-FDG) positron emission tomography (PET) computed tomography (CT) demonstrating a non-FDG avid pelvic mass, initially suspected to represent a pedunculated uterine fibroid. Magnetic resonance imaging revealed a mixed solid-cystic mass separate from the uterus, suspicious for urachal neoplasm, confirmed as mucinous adenocarcinoma on histopathology. Urachal tumors may not be FDG-avid and represent a potential pitfall on FDG PET/CT.

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