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Primary adenocarcinoma of the bladder is a rare tumor type. Histologically it can be mucinous, signet ring cell or clear cell. When diagnosed, it is in the advanced stages and carries a poor prognosis because of its aggressive nature. We report on 9 cases with primary adenocarcinoma of the bladder (2 signet ring cell and 7 mucinous tumors). Those with the advanced stage had a mean survival of 13 months. Of the remaining 4, one survived up to 6 years. This patient had a medium stage tumor and had undergone radical treatment.

Signet ring cell adenocarcinoma of the bladder is rare. Only 16 cases are recorded in the literature, although two meet the requirements for being considered of urachal origin. We present the third case of signet cell adenocarcinoma of urachal origin.