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Updated: Jun 22, 2026
Microsurgical Clip Obliteration of Middle Cerebral Aneurysm Using Intraoperative Flow Assessment
Published on: September 25, 2009
Concept of ideal closure line for clipping of middle cerebral artery aneurysms--technical note
Tatsuya Ishikawa1, Naoki Nakayama, Junta Moroi
1Department of Surgical Neurology, Research Institute for Brain and Blood Vessels-Akita, Akita, Japan. teddyish@akita-noken.go.jp
Insights
The optimum closure line concept aids in clipping middle cerebral artery aneurysms, improving vascular restoration and reducing recurrence risks. Combination clipping techniques are essential for complex aneurysm shapes.
Area of Science:
- Neurosurgery
- Vascular Surgery
- Medical Imaging
Background:
- Cerebral aneurysms pose significant risks, including rupture and ischemic complications.
- Effective surgical management of middle cerebral artery aneurysms is crucial for patient outcomes.
- The concept of an optimum closure line offers a framework for precise aneurysm clipping.
Purpose of the Study:
- To evaluate the application of the optimum closure line concept in clipping middle cerebral artery aneurysms.
- To assess the utility of combination clip techniques for achieving optimal closure lines.
- To determine the impact of this approach on preventing ischemic complications and recurrence.
Main Methods:
- Retrospective analysis of 51 consecutive middle cerebral artery aneurysms in 41 patients.
- Classification of aneurysms into bifurcation, trunk, and combined types based on origin.
- Application of the optimum closure line principle during surgical clipping, utilizing combination techniques when necessary.
Main Results:
- The optimum closure line concept was applied to 51 middle cerebral artery aneurysms (14 ruptured, 37 unruptured).
- Aneurysms were categorized into bifurcation (n=39), trunk (n=9), and combined (n=3) types.
- Combination clip techniques proved useful for creating curved closure lines, essential for certain aneurysm morphologies.
Conclusions:
- The optimum closure line concept provides a valuable guide for clipping cerebral aneurysms, aiming to restore original vascular structure.
- Combination clipping techniques are frequently required to achieve the desired curved closure line, particularly for complex aneurysms.
- This approach aids in minimizing risks of ischemic complications and aneurysm recurrence.
Abstract:
The concept of optimum closure line was applied to a series of 51 consecutive middle cerebral artery aneurysms (14 ruptured, 37 unruptured) in 41 patients, 16 men and 25 women aged 29-79 years (mean 59.1 years). Visual inspection through the operating microscope revealed 3 types of aneurysm based on the origin of the aneurysm: bifurcation type (n = 39), trunk type (n = 9), and combined type (n = 3). Clipping along the optimum closure line should restore the vascular structure to the original configuration. Combination clip techniques were useful to form a curved closure line. This technique requires adequate operative fields with dissection of the aneurysm and related arteries from the neighboring structures as far as possible. The closure line concept is helpful to decide how to apply clips for particular aneurysms to avoid risks of ischemic complication and future recurrence. Combination clip techniques are often necessary to match a curved closure line.
