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Our experience suggests that, with current technology, it is possible to visualize, dissect, and clip cerebral aneurysm using only the endoscope for visualization. Each of the endoscopes requires little or no brain retraction and could be introduced through a bur hole. The penscope would need the largest opening (1.0×1.5 cm), because work is done alongside the scope. However, it overcomes the inherent...
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