Robotic versus laparoscopic enucleation of ovarian endometriotic cysts with pathological analysis of inadvertent follicular loss

Abstract

Ovarian endometrioma cystectomy may compromise ovarian reserve through inadvertent excision of ovarian cortex. We compared inadvertent cortical removal between robotic-assisted and conventional laparoscopic cystectomy using digital pathology. We retrospectively analyzed 81 patients (40 laparoscopic, 41 robotic) who underwent single-surgeon cystectomy (January 2020-December 2025) with digitized hematoxylin and eosin-stained slides available. Ninety-eight ovary/side specimens were classified as follicle-containing cortex, cortex without follicles, or fibrosis, and excised cortical area (mm & sup2;) was quantified. The primary analysis used log-linear regression adjusted for cyst length and width with patient-clustered robust standard errors. Tissue-type distribution did not differ by approach (P = 0.611). Excised cortical area was smaller with robotics (median 34.6 mm & sup2;, interquartile range 16.9-82.3) than laparoscopy (median 65.4 mm & sup2;, interquartile range 39.5-81.6; P = 0.011). In the adjusted model, robotics was associated with a smaller excised cortical area (robot-to-laparoscopy ratio 0.55, 95% confidence interval 0.32-0.93; P = 0.029). Follicle counts and antral follicle presence among follicle-containing specimens were comparable. Robotic-assisted cystectomy was associated with less inadvertent excision of ovarian cortex after accounting for cyst dimensions, while follicle-based specimen metrics did not differ.