Comparison of Surgical and Endovascular Treatments for Partially Thrombosed Intracranial Aneurysms : Insights into Recurrence and Residual Lesions.

Objective: Partially thrombosed intracranial aneurysms (PTIAs) are known to occur for both large and small aneurysms; however, standardized treatment guidelines remain undefined. This study aimed to evaluate and compare the efficacy of surgical and endovascular strategies for managing PTIAs to identify the optimal treatment approach.

Methods: A retrospective analysis was performed on patients diagnosed with PTIAs who underwent surgical or endovascular treatment at our institution from January 2005 to December 2022. Patients with intraluminal thrombi confirmed via brain imaging were categorized based on the treatment modality. A total of 45 patients were included. Clinical outcomes, including preoperative and postoperative modified Rankin Scale (mRS) scores, complication rates, and recurrent or remnant aneurysm rates, were reviewed to analyze the treatment results.

Results: Of the 45 enrolled patients, 31 patients (68.9%) underwent surgical treatment, and 14 patients (31.1%) received endovascular treatment. Surgical approaches included direct clipping, trapping with bypass, and aneurysm wrapping. Multivariate analysis revealed a statistically significant association between the treatment modality and recurrent or remnant aneurysms (P < 0.001). However, no significant differences were identified between the two treatment groups in terms of complication rates or functional outcomes.

Conclusion: In comparison to endovascular treatment, surgical management of PTIAs demonstrated superior efficacy in minimizing recurrent and remnant aneurysms. Considering the comparable rates of postoperative complications and functional outcomes, surgical treatment may be the preferred treatment strategy, particularly for younger patients with longer follow-up periods or for cases requiring decompression.