Decompressive Craniectomy
Decompressive craniectomy is an emergency surgical procedure in which a portion of the skull is temporarily removed and the dura is opened and enlarged to lower intracranial pressure. By preventing the swelling brain from being compressed within the closed skull, it aims to protect vital structures, and it is used particularly in severe head trauma and malignant (large) ischemic stroke.
Last updated: 2026-06-09
Definition
Decompressive craniectomy is the removal of a portion of the skull (bone flap) and the opening of the dura with an enlarging patch (duraplasty) in order to lower raised intracranial pressure (ICP). It provides room for the swelling brain tissue to expand outward within the otherwise closed skull, thereby reducing pressure on the brainstem and blood vessels, the risk of herniation, and secondary ischemic injury. The removed bone flap is usually preserved and replaced in a separate operation (cranioplasty) once the patient has recovered.
Indications
The procedure is considered in conditions with raised intracranial pressure refractory to medical treatment. Principal indications include severe traumatic brain injury (uncontrolled edema and ICP elevation), mass effect from a malignant (large) ischemic stroke involving the middle cerebral artery territory, and in some cases hemorrhage or infection causing uncontrollable brain swelling. The decision is made by considering the clinical picture, imaging findings, the patient's age and general condition, and intracranial pressure measurements together. Timing and patient selection are important factors that influence the outcome.
Procedure
The procedure is performed under general anesthesia. A large frontotemporoparietal (unilateral) or bifrontal (bilateral) scalp incision is usually made; after one or several burr holes are created, a sufficiently large bone flap is removed. To make room for the brain under pressure, the dura is opened and relaxed with an enlarging patch (autologous or synthetic graft). Any associated hematoma is evacuated when needed. The removed bone flap is preserved under sterile conditions (frozen or in a subcutaneous abdominal pocket). Hemostasis is achieved, the brain surface is protected, the scalp layers are closed, and the patient is monitored in intensive care.
Advantages and Limitations
Decompressive craniectomy can rapidly reduce intracranial pressure that cannot be lowered with medical treatment and can be life-saving; by preventing herniation it can protect vital structures such as the brainstem. However, although the procedure lowers pressure, it does not reverse the underlying brain injury; while survival increases, some patients may be left with significant neurological sequelae. Clinical trials show that the balance between survival and functional outcome depends on patient selection. Later replacement of the bone flap (cranioplasty) requires an additional operation and carries its own risks.
Recovery and Risks
The recovery course depends on the severity of the underlying disease and can be long and variable; many patients require a period of intensive care and rehabilitation. Possible risks include infection, bleeding, cerebrospinal fluid leak, hydrocephalus, seizures, the 'syndrome of the trephined' that may appear until the bone flap is replaced, and infection or resorption of the bone flap after cranioplasty. The degree of neurological recovery varies markedly according to the severity of the initial brain injury. No outcome is guaranteed; the decision is individualized by considering the patient's clinical status, imaging findings, and expectations together.
References
- Greenberg MS. Greenberg's Handbook of Neurosurgery. 10th ed. Thieme; 2023:1766.
- Winn HR, ed. Youmans Neurological Surgery. 6th ed. Saunders; 2011:250.
- Quiñones-Hinojosa A, ed. Schmidek and Sweet: Operative Neurosurgical Techniques. 7th ed. Elsevier; 2021:920.
- Hutchinson PJ, et al. Trial of Decompressive Craniectomy for Traumatic Intracranial Hypertension (RESCUEicp). N Engl J Med. 2016.
This article is for general information and does not replace a medical examination. Diagnosis and treatment decisions are individual.