Out of 272 cases of endometriosis treated byabdominal operation between 1948 and 1981, 163cases were successfully followed up. Of the 45patients who underwent conservative surgery,there were 6 recurrences, recurrence rate 13.3％,and one case of recurrence with re-operation2.2％). There were 4 cases of recurrence from Out of 272 cases of endometriosis treated by abdominal operation between 1948 and 1981, 163 cases were successfully followed up. Of the 45 patients who underwent conservative surgery, there were 6 recurrences, recurrence rate 13.3%, and one case of recurrence with re-operation 2.2% There were 4 cases of recurrence from