Craniotomy — Simple, Patient-Friendly Explanation

What a Craniotomy Is (In Simple Terms)

A craniotomy is a surgical procedure in which a small piece of skull bone is temporarily removed so the neurosurgeon can reach the brain.
Once the problem is treated — removing a clot, stopping bleeding, relieving pressure, or accessing a tumor — the bone is placed back in its original position and secured.

Because the bone is returned at the end of the procedure, the shape of the head looks normal once healing is complete.

Why a Craniotomy Is Performed

Craniotomy is used in many emergency and planned neurosurgical situations.
Families most commonly encounter it in cases such as:

• Epidural hematoma (EDH)
• Acute subdural hematoma (ASDH)
• Brain contusions and swelling after trauma
• Intracerebral hemorrhage (ICH) in selected cases
• Brain abscess or empyema
• Certain brain tumors, such as brain metastases, GBM, and meningioma
• High intracranial pressure (ICP) that does not respond to other treatments

In emergency cases, the purpose is usually to relieve pressure and protect the brain from further injury.

Image: Craniotomy depicts the creation of an opening in the skull by making a bone flap to remove an epidural hematoma. The bone flap is eventually replaced and fixed to the skull.

What Happens During the Procedure (Family-Friendly Explanation)

Here is a simple outline of what doctors do during a craniotomy:

1. The patient is under full anesthesia.
2. A skin incision is made over the area of the skull that corresponds to the problem.
3. A round or oval piece of bone — called a bone flap — is gently removed.
4. The neurosurgeon treats the underlying issue (for example, removes a hematoma, stops bleeding, or reduces pressure).
5. The bone flap is placed back and secured with small plates.
6. The skin is closed.

To families, it often looks frightening, but it is a controlled, precise, and standard neurosurgical procedure.

Craniotomy vs. Decompressive Craniectomy (Simple Difference)

These two procedures sound similar but have an important difference:

• Craniotomy:
  The bone is removed temporarily and returned at the end of the operation.
• Decompressive craniectomy:
  The bone is intentionally left off to allow a severely swollen brain more space.
  This is used when intracranial pressure is dangerously high and cannot be controlled by other methods. Decompressive craniectomies are often larger than standard craniotomies, because the goal is to create as much room as safely possible.

Families often hear these terms unexpectedly in the ICU. Understanding the difference helps reduce confusion.

Common Craniotomy Locations (Why Names Sound Complicated)

You may hear terms like “pterional craniotomy” or “retromastoid approach.”
These names simply describe where on the skull the surgeon makes the opening.

Typical locations include:

• Pterional craniotomy — near the temple
• Frontal / parasagittal craniotomy — near the forehead or midline
• Occipital craniotomy — near the back of the skull
• Retromastoid (posterior fossa) craniotomy — behind the ear
• Coronal craniotomy — along the top of the head

These names do not imply the severity of the condition — only the approach.

Recovery After a Craniotomy — What Actually Determines It

Recovery after a craniotomy does not depend on the surgery itself but on the underlying brain condition.
Some patients wake up quickly — for example after surgery for benign tumors or trigeminal neuralgia — while others may remain sedated or unconscious for days or weeks if the original injury was severe (such as acute subdural hematoma, contusions or diffuse brain swelling).

The purpose of the craniotomy is to treat the cause and protect the brain; the recovery pattern reflects the underlying pathology, not the surgical opening of the skull.

Read more about potential complications following craniotomy and open brain surgery on this page.

When Families Should Ask Questions or Request Clarification

It is appropriate to ask the ICU or neurosurgical team about:

• why the craniotomy was necessary,
• what the goals of surgery were,
• how the brain is responding afterward,
• what the next steps are in recovery,
• and what signs of improvement can be expected.

Frequently Asked Questions about Craniotomy