We carry out a review of all the primary bladder T2 tumours in the service in order to evaluate the possibilities of conservative treatment in this category of tumour. Despite being tumours that infiltrated the muscularis, there were all treated initially by transurethral resection. Minimum criteria for classification were the case history, urographies, bimanual touch under anaesthetic and transurethral resection of all tumoural formations, including the whole bladder wall and pericystium. It is a group of 73 patients, 66 males and 7 females, having an average age of 65.6 (range 51-58 years old), with primary transitional bladder tumour, who were followed up over a period ranging from 3 months to 10 years, three years on average. 55 (75.3%) are single tumours and 18 (24.6%) multiple tumours. The degree of anaplasia is G2 in 23 (31.5%) and G3 in 50 (68.5%). Of the 73 patients, 43 (58.9%) 43 (58.9%) are free of disease, 33 (45.2%) of them after a single transurethral resection and 10 who required various transurethral resections due to fresh occurrences of lesser degree and stage. The probability of survival of T2 tumours at 5 years is 72% with a margin of reliability of 11% (p less than 0.05).