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Published on: May 10, 2012
Microsurgical approaches to the pulvinar: A comparative analysis
Eberval Gadelha Figueiredo1, Eduardo Carvalhal Ribas2, Ricardo Moscardi2
1Division of Neurological Surgery, Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo, São Paulo, Brazil; Department of Neurological Surgery, Barrow Neurological Institute, Phoenix, AZ, United States.
The transchoroidal (TC) and subtemporal after parahippocampal resection (STh) surgical techniques offer the most extensive exposure of the cisternal thalamus. SCIT is recommended for deep thalamic lesions, while OI and STh are suitable for pulvinar surface lesions.
Area of Science:
- Neurosurgery
- Anatomical Studies
- Surgical Techniques
Background:
- The cisternal thalamus is a critical anatomical region for neurosurgical interventions.
- Various surgical approaches exist, each with unique advantages and limitations for accessing this area.
- Comparing the extent of exposure offered by different techniques is crucial for optimizing surgical outcomes.
Purpose of the Study:
- To quantitatively compare the exposure areas of the cisternal thalamus provided by four surgical techniques.
- To evaluate the anatomical suitability of supracerebellar-infratentorial (SCIT), occipital interhemispheric (OI), transchoroidal (TC), and subtemporal (ST and STh) approaches.
Main Methods:
- Four surgical approaches (SCIT, OI, ST, STh) were performed bilaterally on three human heads.
- Qualitative anatomical analysis assessed limits, advantages, and flaws of each technique.
- Quantitative analysis measured and compared the areas of exposure.
Main Results:
- Transchoroidal (TC) and subtemporal after parahippocampal resection (STh) yielded significantly larger exposure areas than ST, OI, and SCIT.
- STh provided wider exposure than ST.
- ST offered inadequate exposure and alignment; OI and STh had alignment challenges for deeper dissections; TC disrupted non-pathological tissue but offered good pulvinar exposure; SCIT provided adequate exposure and thalamic axis alignment for deeper lesions.
Conclusions:
- Occipital interhemispheric (OI) and subtemporal after parahippocampal resection (STh) are suitable for pulvinar surface lesions.
- Supracerebellar-infratentorial (SCIT) is recommended for medial pulvinar and deep thalamic axis lesions.
- Transchoroidal (TC) approaches are best for lateral pulvinar and ventricular atrium lesions.
- Subtemporal (ST) approach is unsuitable for cisternal pulvinar exposure due to limited angular access.
