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. Radiation therapy is ineffective, and the results of treatment with segmental resection of the involved area of the bladder are equivalent to those of total cystectomy.