[The problem of post-operative complications after colonic surgery because of malignant tumors (author's transl)].

Post-operative complications after colonic surgery because of malignant tumours were analysed in 412 patients from 1961 to 1974 at the Surgical-Clinic of Innsbruck University. 42% of the patients had postoperative complications. 60% of these complications were directly due to surgery, 40% indirectly. Attention should be paid to the fact that colonic surgery in particular has a high rate of complications, i.e. 76% of these cases seen in relation to 38% of routinely operated patients. With reference to all patients 18 different complications were observed. Causes of these complications and prophylactic treatment, likely to decrease the rate of lethality and complications are discussed.