Laparoscopic surgery has found its firm position in the treatment of benign diseases. Yet, oncologic laparoscopy remains a controversial technique. Its indication is discussed, especially its specific complication in oncologic diseases--recurrence of malign tumors within the scar after the trocar. The authors have performed an extensive recherché on the incidence of local recurrences of malign tumors after laparotomy or laparoscopy. They compare the functional results of both techniques, radical measure of intervention and their technical limits. They analyse the causes of local recurrences as well as possibilities of their reduction. They evaluate also their own experience in laparoscopy performed in coincidence with malign diseases, especially in palliative surgery. They suggest indications of laparoscopy in cases with colorectal carcinoma which is currently, as well as prospectively the most frequent malign disease of the gastrointestinal tract in our region.