Signet-ring cell carcinoma of bladder. Evaluation of three cases with review of literature.

Three cases of adenocarcinoma involving the bladder and consisting mainly of signet-ring-shaped cells are presented. Each case represents a different form that the lesion may take, and these forms are compared. This unusual neoplasm has a worse prognosis than transitional cell carcinoma of the bladder, possibly because of factors that lead to delays in management.