Which one of the following types of cranial surgery is done to remove a bone flap?

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Craniectomy is a surgical procedure in which a portion of the skull is removed to access the brain. This is done to remove a bone flap, which is typically replaced after the procedure is complete. Burr hole surgery involves drilling a small hole into the skull to access the brain, but does not involve removal of a bone flap. Craniotomy refers to the surgical removal of a portion of the skull to access the brain, but typically involves making a flap rather than removing the bone entirely. Cranioplasty is a surgical procedure to repair or replace a portion of the skull that has been removed or damaged.

Which One of the Following Types of Cranial Surgery Is