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Craniectomy – Procedure, Types & Risks

A craniectomy is a neurosurgical procedure in which part of the skull bone is removed to relieve pressure on the brain and treat life-threatening neurological conditions.

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Things worth knowing about "Craniectomy"

A craniectomy is a neurosurgical procedure in which part of the skull bone is removed to relieve pressure on the brain and treat life-threatening neurological conditions.

What is a Craniectomy?

A craniectomy is a neurosurgical procedure in which a section of the skull bone is removed, either temporarily or permanently, to relieve dangerous pressure inside the skull. Unlike a craniotomy, where the bone flap is replaced at the end of surgery, in a craniectomy the opening is intentionally left open to allow the swollen brain room to expand. The primary goal is to reduce intracranial pressure (ICP) and protect brain tissue from further damage.

When is a Craniectomy Performed?

A craniectomy is most commonly performed as an emergency intervention, but may also be part of a planned neurosurgical procedure. Common indications include:

Severe traumatic brain injury (TBI): following accidents with significant brain swelling
Ischemic stroke: particularly in malignant middle cerebral artery infarction with massive cerebral edema
Brain hemorrhage: such as epidural or subdural hematomas causing increased intracranial pressure
Brain tumors: for tumor removal or decompression of surrounding tissue
Brain abscesses: to drain pus accumulations within the brain
Severe brain infections: when inflammation leads to significant pressure buildup

Types of Craniectomy

Decompressive Craniectomy

The decompressive craniectomy is the most common type and is used when intracranial pressure can no longer be controlled with medication alone. By removing a portion of the skull, the swollen brain is given space to expand without sustaining additional injury from compression.

Frontal, Temporal, and Occipital Craniectomy

Depending on the location of the affected brain region, the skull opening may be made at different sites: the forehead (frontal), the temple (temporal), or the back of the head (occipital). A hemicraniectomy involves a large bone removal covering one entire side of the skull.

How the Procedure Works

A craniectomy is performed under general anesthesia. The surgeon makes an incision in the scalp, carefully detaches and removes the targeted section of skull bone, and then opens or expands the tough outer membrane of the brain (dura mater) to provide additional space. The scalp is then sutured closed. The removed bone is stored under sterile conditions – either in a bone bank or placed in the patient's abdominal wall – until it can be reinserted at a later stage during a follow-up procedure called cranioplasty.

After Surgery: Cranioplasty

Once the brain has recovered and intracranial pressure has normalized – typically after several weeks to months – the original bone or a custom implant made of titanium or medical-grade plastic is surgically reinserted. This second procedure is known as cranioplasty and serves both to protect the brain and to restore the normal contour of the skull.

Risks and Complications

As with any surgical procedure, a craniectomy carries potential risks and complications:

Infections (wound infections, meningitis)
Post-operative bleeding
Cerebrospinal fluid accumulation (hydrocephalus)
Damage to brain tissue
Epileptic seizures
Sinking skin flap syndrome: inward collapse of the scalp over the opening, which can cause neurological symptoms
Anesthesia-related risks

Prognosis and Rehabilitation

The outlook after a craniectomy depends heavily on the underlying condition, the extent of brain injury, and the patient's overall health. Following the procedure, intensive neurosurgical follow-up care is essential, along with comprehensive rehabilitation – including physiotherapy, occupational therapy, and speech therapy – to help restore lost neurological functions as much as possible.

References

Cooper, D. J. et al. (2011): Decompressive craniectomy in diffuse traumatic brain injury. New England Journal of Medicine, 364(16), 1493-1502.
Vahedi, K. et al. (2007): Early decompressive surgery in malignant infarction of the middle cerebral artery. The Lancet Neurology, 6(3), 215-222.
Hutchinson, P. J. et al. (2016): Trial of decompressive craniectomy for traumatic intracranial hypertension. New England Journal of Medicine, 375(12), 1119-1130.

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