Forty three patients with borderline ovarian tumours were examined from 1987 till 2000. 28 patients (65.1%) were serous tumours and 15 patients (35%) were mucinous. The median age was 42.2 +/- 15.4 years. The follow-up period was 5.4 +/- 3.2 years. Preoperatively Ca125 were 52.5 +/- 50.3 and of Ca19.9-42.4 +/- 46.8 IU. 83% of the patients were in stage I and 17% in stage III. There was no significant difference in the tumour volumes. Ca125 were significantly increased in the serous tumours and Ca19.9 were increased in the mucinous tumours. All the patients were followed up and are in good health or remission with exception of 2 who developed recurrence.