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Proper usage of brain retractors in the interhemispheric fissure based on MRI microanatomy: technical note
1Department of Neurosurgery, Hokkaido University School of Medicine, Sapporo, Japan.
Abstract:
The authors present a method of the surgical dissection of the interhemispheric fissure based on high resolution magnetic resonance images (MRI). The dissection of the interhemispheric space is not easy because the brain surfaces are tightly adherent in the interhemispheric fissure. In other words, in the interhemispheric fissure, the apices of the gyri are touching and are tightly bound together. This microanatomy is clearly revealed using high resolution three-dimensional MRI. The principle of the usage of the brain retractor is to apply them symmetrically in order to give an even tension to both sides. However, in the interhemispheric dissection, this principle should be slightly modified. Namely the brain retractors should be placed on the crest of gyri on both sides to avoid the injury of small arteries located in the sulci by the edge of the brain retractors.
Insights
This study introduces a surgical dissection method for the interhemispheric fissure using high-resolution MRI. It details a modified retractor placement to prevent injury to delicate arteries within the sulci.
Area of Science:
- Neurosurgery
- Neuroimaging
- Anatomy
Background:
- Surgical dissection of the interhemispheric fissure is challenging due to tightly adherent brain surfaces.
- The microanatomy of the interhemispheric fissure, with gyri apices touching, complicates surgical access.
- High-resolution three-dimensional magnetic resonance imaging (MRI) provides clear visualization of this complex space.
Purpose of the Study:
- To present a refined surgical dissection technique for the interhemispheric fissure.
- To highlight the utility of high-resolution MRI in understanding the fissure's microanatomy.
- To propose modifications to standard brain retractor application for safer interhemispheric dissection.
Main Methods:
- Utilizing high-resolution three-dimensional MRI to delineate the interhemispheric fissure's intricate anatomical details.
- Developing a modified surgical approach for dissecting the interhemispheric fissure.
- Adapting the principle of symmetrical brain retractor application for enhanced safety.
Main Results:
- High-resolution MRI effectively visualizes the adherent gyri and sulci within the interhemispheric fissure.
- A modified brain retractor placement technique is proposed, positioning retractors on the crest of gyri.
- This modification aims to prevent injury to small arteries located within the sulci.
Conclusions:
- The presented method, guided by high-resolution MRI, offers a safer approach to interhemispheric fissure dissection.
- Modified retractor placement is crucial for avoiding vascular injury in this delicate surgical field.
- Accurate anatomical understanding from advanced imaging is key to optimizing neurosurgical techniques.