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Figure 2: A burr hole made in the midline. Using high-speed drill and acorn-shaped drill bit, a burr hole can be placed at the midline. Because the shape of the acorn drill bit matched the midline keel, this technique helps minimize risks of dural injury when coming across the keel with a scissor or rongeur

Figure 2: A burr hole made in the midline. Using high-speed drill and acorn-shaped drill bit, a burr hole can be placed at the midline. Because the shape of the acorn drill bit matched the midline keel, this technique helps minimize risks of dural injury when coming across the keel with a scissor or rongeur