Open Access

RESIDENT’S CORNER

Cystic mucinous tumors of the urachus: carcinoma in situ or adenoma of unknown malignant potential?

Akl C. Fahed¹, Daisuke Nonaka², Jamie A. Kanofsky³, William C. Huang³

1 Department of Genetics, Harvard Medical School, Boston, Massachusetts, USA
2 Department of Pathology, New York University, New York, New York, USA
3 Department of Urology, New York University, New York, New York, USA
Address correspondence to Dr. William C. Huang, Department of Urology, New York University, 150 East 32^nd Street, Second Floor, New York, NY 10016 USA

Canadian Journal of Urology 2012, 19(3), 6310-6313.

Abstract

Mucinous cystadenocarcinomas of the urachus are rare. Mucinous benign or premalignant tumors are even rarer, yet pose a challenge in diagnosis and management. We report a case of a 66-year-old man with lower abdominal pain who had a large cystic tumor at the dome of the bladder. En-bloc resection of the tumor with partial cystectomy revealed mucinous cystadenocarcinoma in situ. We reviewed the characteristics of all seven previously reported cases. These tumors are pre-malignant and can cause significant morbidity and mortality. They need to be treated similar to conventional mucinous cystadenocarcinoma by wide surgical resection and partial cystectomy.

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