Craniotomy is a procedure where a small part of the skull is removed. Watch this video by Dr Nigel, Senior Consultant Neurosurgeon, Gleneagles Global Health City, Chennai to understand what craniotomy is.

The craniotomy procedure begins by making an incision in the scalp elevating a skin flap. Few burr holes are made in the skull and then using a high-speed drill, a fragment is removed. A section of the skull is removed.

Beneath the skull, there are three layers of the membrane which cover the brain which has to be opened to reach the brain.