This is an open surgery where an incision is made with a scalpel, near the area of treatment.
The incision is made into the scalp, generating a hole or bone flap in the skull. This type of open surgery is performed when the neurosurgeon needs to remove tumors
originating in the brain, to drain blood or fluids arising from an infection, clip off aneurysms, or remove abnormal brain tissue.
On completion of the procedure the bone flap is replaced with sutures, plates or wire.
Sometimes in some cases the opening made in the skull may be left open, especially when treating tumors, brain swelling and infections. Leaving the surgical point of
incision open is known as craniotomy.