[Carcinoma in situ of the bladder. Apropos of 10 cases]

10 cases of primary carcinoma in situ are described and the symptomatology of the disease is analysed. The role of cytodiagnosis is emphasised. The evolution is variable. In 2 cases the bladder became totally retracted and total cystectomy had to be performed in spite of the fact that the lesion remained intra-urothelial. Invasive cancer developped only in 2 cases: 7 and 6 years after diagnosis. Conservative treatment by Tur seems logical whilst the carcinoma remains strictly "in situ".