Surgical indications in URC are examined in relation to various situations of election, emergency and urgency. The various possible surgical procedures are analysed, stress being laid on criteria of choice which take account of the seriousness of the disease and of the different technical solutions now available. A series of 30 operations in 145 cases of URC is presented and complications examined in relation to the type of operation performed and to the indications. Stress is laid on the importance of intervening adequately so as to achieve the best prognostic results.