Coil-Protected Technique for Liquid Embolization in Neurovascular Malformations.

Area of Science:

• Neurosurgery
• Interventional Radiology
• Vascular Neurology

Background:

• Neurovascular malformations, including arteriovenous fistulas (AVFs) and arteriovenous malformations (AVMs), present significant treatment challenges.
• Conventional embolization techniques may be limited by complex vascular anatomy, such as tortuous feeding arteries or narrow safety margins.

Purpose of the Study:

• To evaluate the safety and efficacy of the coil-protected technique for liquid embolization in treating neurovascular malformations.
• To assess the technical success, occlusion rates, and clinical outcomes associated with this novel embolization method.

Main Methods:

• Retrospective evaluation of 22 patients with cranial or spinal AVFs/AVMs treated with coil-protected liquid embolization.
• Embolization utilized N-butyl cyanoacrylate and/or Onyx, with the coil-protected technique employed to facilitate agent delivery and prevent reflux.
• Technical success was defined by sufficient lesion filling without unintentional reflux; outcomes were assessed via angiography and clinical follow-up.

Main Results:

• All 36 target feeder vessels were successfully embolized using the coil-protected technique.
• Complete or near-complete occlusion of AVFs/AVMs was achieved in 19 and 3 patients, respectively, on follow-up angiography.
• Significant neurological symptom improvement was observed, with complete resolution in 68.2% and partial improvement in 31.8% of patients, with no treatment-related complications.

Conclusions:

• The coil-protected technique is a safe and effective method for liquid embolization of neurovascular malformations and fistulas.
• This technique offers a valuable alternative for patients who are not candidates for or have not benefited from conventional embolization approaches.
• The study demonstrates high rates of technical success, favorable occlusion, and clinical improvement in a challenging patient cohort.