Primary Umbilical Neoplasm Demonstrated on FDG PET/CT

Organized urachal abscess mimicking urachal carcinoma on FDG PET/CT

Urachal inflammation is rarely seen in adults. Two patients with suspected abdominal tumor underwent FDG PET/CT. One patient showed an irregular hypermetabolic mass anterosuperior to the bladder. The other patient showed a thick-walled cystic mass with strong FDG uptake extending from the bladder dome to the anterior abdominal wall. Urachal carcinomas were suspected based on imaging findings. Both patients underwent complete resection of the masses. However, both masses were organized urachal abscesses confirmed by pathological examination. These two cases highlight that differentiation between organized urachal abscess and carcinoma is difficult on the basis of imaging.

Sister Mary Joseph nodule in endometrial carcinoma: detection with FDG PET/CT

Sister Mary Joseph nodules are very rare. They are commonly caused by gastrointestinal tract and ovarian cancers, but they are seen rarely in uterine carcinoma, lung carcinoma, breast carcinoma, and others. We present F-FDG PET/CT findings in a 55-year-old woman with endometrial adenocarcinoma, who presented with a mass protruding from the umbilicus after surgery and pelvic radiotherapy.