[Borderline ovarian tumours: a challenge for clinicians]

A retrospective analysis of surgical procedures for ovarian tumours, performed in the Department of General and Oncological Gynaecology at the Military Medical Academy (Sofia, Bulgaria) specified 81% of the tumour cases as benignant ones, 15.6% as malignant ones, and 3.4% as borderline ovarian tumours (BOT). The histological type of BOT was assessed as serous in 62% and as mucinous in 38%. The incidence of BOT was found to increase with increasing age. Most patients with BOT were parous (60%). Serum levels of CA 125 were within normal values in all patients with BOT.