Signet-ring cell carcinoma of the bladder and the prostate. Report of 4 cases.

During a 9-year period in our clinic 4 patients were seen with signet-ring cell carcinoma. 2 patients had primary signet-ring cell carcinoma of the bladder, 1 of the prostate. In the 4th case the tumor was located near the penoscrotal angle of the urethra. These cases are reviewed and their main characteristics, mentioned in the literature, are discussed briefly.