Clinical characteristics of endometrioma with and without dysmenorrhea diagnosed by laparoscopy: A retrospective cohort study in a tertiary center

Objective: Clinical characteristics of patients with endometrioma without dysmenorrhea have not been well delineated; our goal was to remedy this issue by performing a retrospective cohort study. Methods: A total of 379 patients who underwent laparoscopic surgery for endometrioma ≥4 cm at a tertiary hospital were included in this retrospective study. Patients were divided into two groups based on the presence of dysmenorrhea at the time of hospital visit; with dysmenorrhea group and without dysmenorrhea group. Results: Patients without dysmenorrhea comprised 9.5% of all surgically confirmed endometriomas. Significant differences were found in the revised American Society for Reproductive Medicine (rASRM) stage, age at surgery, and bilaterality. Patients with rASRM stage IV were more likely to have dysmenorrhea than were subjects with rASRM stage III (odds ratio (OR), 10.58; 95% confidence interval (CI), 4.63–24.21; P < 0.001). Older patients were less likely to have dysmenorrhea (OR, 0.94; 95% CI, 0.88–1.00; P = 0.045), as were patients with bilateral rather than unilateral endometrioma (OR, 0.36; 95% CI, 0.15–0.82; P = 0.015). No significant differences in cyst size, age at menarche, body mass index (BMI), parity, or history of previous ovarian surgery were found between the two groups. Conclusion: Patients without dysmenorrhea comprised 9.5% of endometrioma cases and had less advanced rASRM stage, were older at surgery, and had a higher probability of bilateral than unilateral endometrioma than patients with dysmenorrhea.