[Primary epidermoid carcinoma of the bladder. Its diagnosis and treatment and a review of the literature].

Presentation of four patients with primary plain epidermoid carcinoma of the bladder. The patients, three men and one woman, aged 50-74 years, presented clinically with gross haematuria and irritative mictional syndrome; their background was prostatism with in-dwelling vesical catheter and repeat urinary infections. Revision of the immunohistochemical pattern and the clinico-pathological differential diagnosis, as well as the pathoetiology, biological behaviour and management of this uncommon type of tumour.