Supratentorial Craniotomy
Fellowship-trained brain tumor surgeons • 12 hospital affiliations across New JerseySupratentorial craniotomy opens the skull above the tentorium cerebelli to access the cerebral hemispheres the largest part of the brain, responsible for motor function, language, memory, vision, and higher cognitive processing. It is the most commonly performed craniotomy and encompasses a wide range of targeted approaches for brain tumors, vascular lesions, epilepsy surgery, and other pathologies in the forebrain.
Key takeaways
- Supratentorial craniotomy is a family of approaches frontal, temporal, parietal, occipital, pterional, orbitozygomatic each providing targeted access to specific cerebral hemisphere regions.
- The size of the craniotomy has decreased dramatically with modern neuronavigation and minimally invasive techniques many craniotomies are now 3 to 5 cm.
- Neuronavigation (GPS for the brain), intraoperative ultrasound, and fluorescent imaging guide the surgeon to the target and help confirm complete tumor removal.
- Location within the brain determines functional risk tumors in or near eloquent cortex are candidates for awake craniotomy and intraoperative brain mapping.
- Most patients spend 1 to 3 nights in hospital after supratentorial craniotomy and return to light activity within 2 to 4 weeks.
| Region accessed | Cerebral hemispheres frontal, temporal, parietal, occipital lobes |
| Common approaches | Frontal, temporal, parietal, pterional (frontotemporal), orbitozygomatic, interhemispheric |
| Anesthesiav | General anesthesia or awake anesthesia for eloquent-region tumors |
| Conditions treated | Glioma, meningioma, metastasis, cavernous malformation, AVM, abscess, epilepsy focus |
| Key technologies | Neuronavigation, intraoperative ultrasound, 5-ALA fluorescence, IONM |
| Hospital stay | 1 to 3 nights for most craniotomies |
Timing and stay vary by patient and complexity. Your surgeon will confirm what to expect in your case.
Supratentorial approaches
Frontal craniotomy
Access to frontal lobe tumors, anterior skull base meningiomas, and interhemispheric lesions. A bifrontal approach provides the widest access; a unilateral approach is used for lateralized lesions.
Temporal craniotomy
Access to temporal lobe tumors, middle fossa skull base lesions, and the lateral sylvian fissure the corridor to deep insular tumors. The temporal lobe is the seat of dominant (left) hemisphere language in most right-handed people, making functional mapping critical for left temporal tumors.
Parietal craniotomy
Access to parietal lobe tumors and lesions of the postcentral gyrus (sensory cortex) and superior parietal lobule.
Pterional craniotomy
A workhorse approach in neurosurgery the frontotemporal craniotomy provides access to the sylvian fissure, anterior skull base, circle of Willis aneurysms, cavernous sinus, and temporal lobe pathology through a single well-concealed incision behind the hairline.
Interhemispheric approach
The space between the two cerebral hemispheres provides access to the corpus callosum, thalamus, hypothalamus, third ventricle, and other deep midline structures.
Minimally invasive and keyhole craniotomy
Modern neuronavigation and endoscopic assistance allow many supratentorial craniotomies to be performed through smaller openings than was previously possible. A keyhole craniotomy of 2 to 3 cm, positioned precisely over the tumor using navigation, can provide sufficient access for a large proportion of brain tumor resections while minimizing scalp incision, bone removal, and brain exposure.
Intraoperative technologies that extend the reach of minimally invasive craniotomy include:
- Neuronavigation: Tracks instruments in three-dimensional MRI space throughout the procedure
- Intraoperative ultrasound: Real-time imaging of the tumor through the craniotomy updates for brain shift during surgery
- 5-ALA fluorescence: Highlights malignant tumor cells under violet light for more precise resection margins
- Exoscope: A high-definition 3D camera on an arm replaces the traditional microscope in some centers, providing better ergonomics and visualization
Benefits and risks
Potential benefits
- Direct access to pathology within the cerebral hemispheres with precise, pre-planned approach trajectory
- Modern techniques enable minimally invasive keyhole craniotomies through small incisions
- Intraoperative technologies extend precision and completeness of tumor removal
- Short hospital stay and relatively rapid return to daily activity compared to historical outcomes
Possible risks
- Neurological deficit from cortical or subcortical injury risk determined by tumor location and proximity to eloquent areas
- Brain swelling (edema) in the peri-operative period managed with steroids
- Seizures -- risk present with any cortical manipulation; prophylactic antiepileptic medication is commonly used
- Infection, wound complications, CSF leak low rates with modern technique
Your surgeon will review the benefits and risks specific to your diagnosis during your consultation.
What recovery looks like
Recovery from supratentorial craniotomy is generally straightforward for most patients:
- Day of surgery Awakening in recovery or ICU. Post-operative neurological examination. CT or MRI within 24 hours.
- Days 1 to 3 Hospital stay of 1 to 3 nights. Walking and light activity begin the day after surgery. Fatigue and headache are common.
- Weeks 1 to 4 Return to light activity and desk work for most patients. Steroid taper if prescribed. Physical or speech therapy if post-operative deficits are present.
- 4 to 6 weeks Follow-up MRI to assess resection. Oncology and radiation oncology appointments for adjuvant treatment planning if applicable.
Frequently asked questions
How big is the craniotomy incision?
Modern craniotomies are much smaller than those of prior decades. For most brain tumors, the scalp incision is 6 to 10 cm and the bone opening is 3 to 5 cm sized precisely to provide access without unnecessary exposure. The bone is replaced at the end of the procedure and secured with small titanium plates and screws.
Will my hair be shaved for the craniotomy?
Only the hair along the incision line is shaved typically a strip 2 to 3 cm wide. Hair-sparing approaches have largely replaced full head shaving and the scar is designed to be concealed within the hairline where possible.
Is it safe to be on blood thinners before craniotomy?
Most blood thinners and antiplatelet medications are stopped before craniotomy to reduce bleeding risk. The timing of stopping depends on the specific medication and the urgency of the surgery. Your surgical team will provide specific pre-operative instructions. Emergency craniotomies for urgent neurological deterioration can be performed after reversal of anticoagulation.
How soon can I return to work after craniotomy?
Return to desk work typically occurs 2 to 4 weeks after an uncomplicated craniotomy for most patients. Return to physical labor or driving depends on the specific procedure and any post-operative neurological changes. Your surgeon will provide individualized guidance at your post-operative visits.
This page is for general education and does not replace medical advice. Treatment decisions should be made with a qualified neurosurgeon based on your individual diagnosis and imaging. To discuss your options, call Atlantic Brain and Spine Brain Tumor Care at 973.993.7322 or request a consultation.
Brain Tumor Surgery Specialists at Atlantic Brain and Spine
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