What is creniotomy
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Craniotomy
A craniotomy is a neurosurgical procedure in which a portion of the skull (called a bone flap) is temporarily removed to access the brain for diagnostic or therapeutic purposes. The bone flap is replaced at the end of the procedure. (Note: you may have meant "craniotomy" - not "creniotomy," which is not a standard medical term.)
History
Archaeological evidence shows craniotomy has been practiced since prehistoric times. The modern era of craniotomy began in the 20th century, when improvements in sterile technique and surgical refinement dramatically reduced morbidity and mortality. - Neuroanatomy through Clinical Cases, p. 195
Step-by-Step Procedure
- Positioning - The patient's head is positioned to give optimal access to the target brain region.
- Scalp preparation - Hair is clipped, the scalp is cleaned, and a skin incision is made to expose the skull.
- Burr holes - Multiple burr holes are drilled through the skull at key points in the operative field, carefully avoiding the dura.
- Bone flap removal - A small saw joins the burr holes so a section of bone (the bone flap) can be lifted out.
- Dural opening - The dura mater (tough covering over the brain) is carefully incised and folded back to expose the brain.
- Procedure performed - The neurosurgeon carries out the intended operation (e.g., tumor removal, clipping an aneurysm, draining a hematoma).
- Closure - The dura is sutured, the bone flap is replaced and secured, and the scalp is closed. If the bone flap is not replaced, the procedure is called a craniectomy (used when the brain needs room to swell, e.g., after severe trauma or stroke). - Neuroanatomy through Clinical Cases, p. 195
Common Indications
- Brain tumors (biopsy or resection)
- Intracranial hematomas (epidural, subdural, intracerebral)
- Brain aneurysm clipping
- Arteriovenous malformation (AVM) treatment
- Epilepsy surgery (temporal lobe seizure focus resection)
- Brain abscess drainage
- Intracranial pressure relief after trauma
Types of Craniotomy (by location)
| Type | Bone Removed | Access To |
|---|---|---|
| Pterional | Temple region (frontal/parietal/temporal/sphenoid junction) | Anterior circulation aneurysms, cavernous sinus, suprasellar tumors |
| Temporal | Lateral temporal skull | Temporal lobe, most intracranial hematomas |
| Frontal | Frontal skull | Frontal lobe tumors, lesions |
| Suboccipital | Posterior fossa | Cerebellopontine angle, brainstem, vertebral artery, lower cranial nerves |
Special Variants
- Awake craniotomy - The patient is kept awake during part of the procedure so the surgeon can monitor speech and motor function in real time. Used for tumors near eloquent (language/motor) cortex.
- Keyhole craniotomy - A minimally invasive approach using a very small opening.
- Decompressive craniectomy - A large craniotomy (up to 15x12 cm) where the bone flap is not replaced, allowing the brain to swell outward to prevent fatal pressure increases.
- Stereotactic/image-guided procedures - Minimally invasive; instruments are introduced through a small burr hole and directed by imaging to deep brain targets.
Key Anesthetic Considerations
During craniotomy, the anesthesiologist must closely monitor and control intracranial pressure (ICP) and cerebral blood flow. A lumbar drain is sometimes used to remove CSF and improve mechanical brain relaxation during the procedure. - Neuroanatomy through Clinical Cases, p. 195
Risks
- Bleeding / hematoma
- Infection (including meningitis, especially if CSF leaks)
- Brain swelling
- Stroke / neurological deficit
- Seizures
- CSF leak (particularly with bifrontal approaches that breach the frontal sinuses)
- Skin flap ischemia (if the superficial temporal artery is sacrificed) - Fischer's Mastery of Surgery, p. 7248
In summary, craniotomy is the foundational open neurosurgical technique that gives surgeons direct access to the brain. Increasingly, minimally invasive alternatives (neuroendoscopy, stereotaxy, transsphenoidal approach) are used when possible to reduce patient morbidity.
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