Recurrence rates and associated risk factors after conservative surgery for adenomyosis: a retrospective study.

Background: Conservative surgery for adenomyosis has been shown to be effective. However, risk factors for postoperative recurrence have yet to be clarified. In this study, we aimed to determine the recurrence rate after conservative surgery for adenomyosis and identify the risk factors for recurrence.

Methods: This retrospective study was conducted in a tertiary hospital. Patients who underwent conservative surgery for adenomyosis between January 2013 and April 2023 were identified. Eligible patients were assigned to either the recurrent or non-recurrent group. Continuous and categorical variables were compared between the two groups using the Mann-Whitney U test or chi-squared test. Risk factors for recurrence were identified by Cox proportional risk analysis.

Results: Data for 133 eligible patients who underwent conservative surgery for adenomyosis were analyzed. The mean follow-up duration was 52 months. The recurrence rate after conservative surgery was 39.1% (52/133). Cox proportional risk analysis identified adenomyosis involving the posterior uterine wall (hazard ratio [HR] 6.505, P = 0.018), two or more adenomyotic lesions (HR 6.310, P = 0.030), laparotomy (HR 2.490, P = 0.029), and concomitant endometriosis (HR 2.313, P = 0.036) to be risk factors for recurrence after conservative surgery. Postoperative combined progestogen therapy (HR 0.126, P < 0.001) or treatment with a gonadotropin-releasing hormone agonist (GnRHa) (HR 0.237, P = 0.004) prevented recurrence of adenomyosis.

Conclusion: Adenomyosis continues to have a relatively high long-term recurrence rate after conservative surgery. Patients with adenomyosis involving the posterior wall of the uterus, those with two or more adenomyotic lesions, and those with concomitant endometriosis are at high risk for recurrence after conservative surgery. Postoperative progestogen or GnRHa therapy may reduce the risk of recurrence of adenomyosis. Considering the retrospective nature of this study and its small sample size, larger prospective studies are needed to confirm its findings.