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: firstname.lastname@example.org.