[The number and histopathologic type of ovarian tumors operated during cesarean section at the Polish Mother's Health Institute between 1990-2000].

Objectives: The differences exist in concerning the estimation of number and histopathological type of ovarian tumors in pregnancy.

Material And Methods: From all 41,661 labours which took place in our Institute between 1990-2000 retrospective analysis of medical documentation of 11,050 caesarean sections (CS) as well as histopathological protocols were performed.

Results: The prevalence of ovarian tumors removed during CS performed between 28-41 weeks of gestation was 0.19%. The prevalence of malignancy was low (0.005% of all labours). Unilateral cystectomy was found to be the most frequent kind of surgery and adult teratoma, serous cyst and paraovarian cyst as most common histopathological tumor types.

Conclusion: We conclude that ovarian tumors, especially of malignant type are rarely the complication of pregnancy. The most are benign, small, unilocular and smooth-wall cystic tumors.