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18F-FDG PET/CT in Urachal Abscess

Flaus, Anthime, MD, MSc*; Longo, Maria-Giulia, MD*; Dematons, Marine, MD; Granjon, Denise, MD*; Prevot, Nathalie, MD*‡§

doi: 10.1097/RLU.0000000000002524
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We report interesting images of a pelvic mass in an 11-year-old girl. She presented with fever, chronic fatigue, and weight loss without abdominal pain. Abdominal ultrasound, contrast-enhanced CT, and 18F-FDG PET/CT were equivocal. 18F-FDG PET/CT revealed an irregular, intense FDG-avid pelvic mass in close contact with the bladder. Both infectious and malignancy complications were suspected, but pathological examination confirmed a urachal abscess. As most of the urachal carcinomas are mucinous adenocarcinomas with low or non-FDG uptake, intense uptake might indicate an abscess rather than a carcinoma.

From the Departments of *Nuclear Medicine, and

Radiology, CHU Saint-Etienne;

INSERM, U1059, Saint-Etienne; and

§Université de Lyon, Lyon, France.

Received for publication September 27, 2018; revision accepted January 25, 2019.

Conflicts of interest and sources of funding: none declared.

Correspondence to: Anthime Flaus, MD, MSc, Service de Médecine Nucléaire, Hopital Nord, CHU de St Etienne, 42055 Saint-Etienne Cedex 2, France. E-mail: anthime.flaus@gmail.com.

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