Basilar trunk artery aneurysms (BTAs) represent one of the most intricate and elusive challenges within neurosurgical practice. Situated along the basilar trunk—a critical artery that nourishes the brainstem—these aneurysms are exceedingly rare, making up a minuscule fraction of intracranial aneurysm cases. Their deep-seated location amidst vital neurological structures complicates both diagnosis and treatment, creating significant clinical uncertainties. Recent strides in endovascular therapies, particularly with the advent of flow diverter devices, have ushered in new hope for patients affected by these formidable cerebrovascular lesions.
A pioneering study led by Dr. Youxiang Li at Beijing Tiantan Hospital, Capital Medical University, together with Dr. Wei Feng from Songyuan Jilin Oilfield Hospital, offers a robust analysis of treatment outcomes for BTAs in the modern era defined by flow diverter innovations. Published in the March 2026 issue of the Chinese Neurosurgical Journal, this important research fills a notable void in neurosurgical literature by systematically evaluating the efficacy and safety of minimally invasive endovascular treatments in a sizable cohort despite the aneurysms’ rarity.
The researchers performed a retrospective review spanning nearly five years, encompassing 2,759 patients who underwent interventions for cerebral aneurysms from 2018 through 2022. Within this large group, they identified 37 patients harboring basilar trunk artery aneurysms. This dataset was augmented by an exhaustive review of global clinical reports dating from 2013 to 2024 to contextualize their findings amidst evolving neurosurgical practices and device technologies.
Endovascular treatments for BTAs explored in this study ranged from traditional coil embolization techniques to advanced stent-assisted coiling and the increasingly popular flow diverter approach. Among these modalities, stent-assisted coiling predominated, employed in just over half the cases, serving as a versatile treatment for aneurysms unsuitable for simple coiling. Flow diverters—a technologically sophisticated implant that redirects blood flow away from the aneurysm sac to foster thrombosis and healing—were utilized in nearly 30% of patients. The latter was typically reserved for complex aneurysms characterized by large size or fusiform morphology, which remain innately difficult to treat.
The study’s imaging follow-up outcomes were striking. Approximately 72% of patients achieved complete aneurysm occlusion, signifying total isolation of the aneurysmal sac from cerebral circulation post-treatment. Another 19% demonstrated near-complete occlusion, painting an optimistic picture about the durability of modern endovascular approaches. These angiographic successes paralleled favorable clinical results, with almost 89% of patients experiencing minimal to no disability at follow-up. Such functional preservation is pivotal, given the brainstem’s indispensable role in autonomic and motor functions.
Despite these encouraging statistics, the study candidly acknowledges the inherent risks of treating BTAs, underscoring a procedure-related complication rate of around 11%. These adverse events encompassed both hemorrhagic and ischemic phenomena, reflecting the delicate balance between effective aneurysm exclusion and preservation of surrounding brain tissue. Tragically, two patients succumbed during the follow-up period, a somber reminder of the high-stakes nature of interventions in this complex vascular territory.
Intriguingly, aneurysm size emerged as an important, albeit statistically non-significant, factor correlating with outcomes. Larger BTAs tended to portend greater complication rates and less favorable recovery trajectories. This association underscores the necessity for meticulous preoperative planning and individualized therapeutic strategies tailored to the morphology and hemodynamic profile of each aneurysm, as emphasized by Dr. Li.
The evolution of endovascular technologies from traditional coiling to the deployment of flow diverters marks a transformative shift in neurosurgical practice. While coiling remains a foundational tool due to its simplicity and widespread experience, flow diverters represent a leap forward, particularly for anatomically challenging aneurysms that resist complete obliteration by simpler means. Their ability to reconstruct the parent artery and promote natural vessel healing offers a paradigm shift for managing complex cerebrovascular lesions.
The research’s retrospective design and single-center scope inherently limit the generalizability of its conclusions, a caveat duly noted by the authors. The rarity of BTAs constrains sample sizes, impeding large-scale prospective trials that could definitively establish treatment algorithms. Nonetheless, this study lays vital groundwork, highlighting key trends and initiating a framework for future multicenter collaborations and randomized investigations.
Beyond clinical intricacies, this body of work sheds light on the growing importance of minimally invasive methodologies in neurosurgery. Such approaches minimize surgical trauma, reduce perioperative morbidity, and facilitate swifter patient recoveries—an especially valuable advantage when operating near the brainstem’s critical neural networks.
Looking forward, the authors advocate for intensified research focused on optimizing management protocols for higher-risk individuals, particularly those presenting with large or giant BTAs. Innovations in device design, imaging modalities, and perioperative care hold promise for further improving both procedural safety and long-term neurological outcomes in this challenging patient population.
Ultimately, while BTAs continue to pose significant treatment challenges due to their rarity and anatomical complexity, this landmark study underscores that effective, durable management is attainable through tailored, cutting-edge endovascular techniques that harness the capabilities of modern neurointerventional technology.
Subject of Research: People
Article Title: Endovascular treatment for basilar trunk artery aneurysm in the flow diverter era: A consecutive series and review of literature
News Publication Date: 5-Mar-2026
References: DOI: 10.1186/s41016-025-00422-6
Image Credits: Dr. Wei Feng from Songyuan Jilin Oilfield Hospital, China, and Dr. Youxiang Li from Capital Medical University, China
Keywords: Neuroscience, Aneurysms, Surgery, Blood vessels, Neurosurgery, Radiology, Imaging, Biomedical engineering, Clinical studies
