In this study, we used mesoscopy to examine the ovarian veins of 30 female corpses for the presence of valves and cusps. One hundred and thirty-one valves were observed in the ovarian veins examined. Most of the valves (91/131 valves or 69.4%) occurred in the distal third of the vein, followed by 27/131 valves (20.6%) in the middle third and, 13/131 valves (10.0%) in the proximal third. The valves consisted of one to five cusps, with most being bicuspid (121/131 or 92.4%): most bicuspid valves (88/121 valves or 72.7%) occurred in the distal third, 24/121 (19.8%) occurred in the middle third and 9/121 (7.4%) were found in the proximal third. Six tricuspid valves (6/131 or 4.5%) were observed, 5 in the distal third and 1 in the proximal third. Only one pentacuspid valve (0.8%) was found in a distal third, whereas three unicuspid valves (2.3%) occurred in the middle third (two cases) and proximal third (one case).These observations confirmed the existence of valves in ovarian veins and suggest that pelvic varicocele may develop when the valves become incompetent, and this may lead the patient to suffer pelvic pain.