We report on a 44-year-old man with the rare case of a mucin-positive carci
noma of the urachus. We performed extended partial cystectomy with regional
staging lymphadenectomy of the obturator lymph nodes. Histological investi
gation revealed a mucin-positive carcinoma of the urachus with negative lym
ph nodes. For this case, we present symptoms, a plan for diagnosis, and tre
atment of these tumors.