What question did this study set out to answer?

To report the findings of an asymptomatic urachal mucinous adenocarcinoma detected incidentally during imaging.

April 10, 2026

An Asymptomatic Urachal Mucinous Adenocarcinoma on FDG PET/CT

Key Points

To report the findings of an asymptomatic urachal mucinous adenocarcinoma detected incidentally during imaging.
Patient presented with elevated serum carcinoembryonic antigen level.
CT imaging revealed a cystic-solid pelvic mass.
Staging FDG PET/CT showed increased uptake in the mass.
Surgical resection was performed and histopathological evaluation was conducted.
Histopathologic analysis confirmed urachal mucinous adenocarcinoma.
The lesion showed no evidence of metastasis on imaging.
The patient had a successful recovery after surgery.

Abstract

A 42-year-old man presented with an incidentally discovered, elevated serum carcinoembryonic antigen (CEA) level. Although colonic polyps were identified and removed through polypectomy, his CEA level remained persistently elevated. Subsequent CT revealed a cystic-solid mass in the midline upper pelvis, raising suspicion for malignancy. Staging FDG PET/CT demonstrated increased FDG avidity in the known mass, with no evidence of metastasis. The lesion was surgically resected, and histopathologic analysis confirmed a rare urachal mucinous adenocarcinoma. The patient recovered well postoperatively. Urachal mucinous adenocarcinoma should be considered in the differential diagnosis of hypermetabolic midline pelvic masses on FDG PET/CT imaging.

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Discussion

Journals

Clinical Nuclear Medicine

Institutions

Peking Union Medical College Hospital

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