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Neuronavigation maps your own scans in real time so the surgeon knows exactly where they are inside the brain. Live monitoring watches your speech and movement pathways throughout — for safer, more complete tumour removal, coordinated by CION with accredited neurosurgical partners.
If a scan has found a brain tumour, one of the biggest worries is how surgery might affect the things that make you you — talking, moving, remembering. Modern brain tumour surgery is far more precise than most people imagine, thanks to two tools that work as a pair: neuronavigation and intra-operative neuromonitoring.
Neuronavigation turns your own MRI into a live, on-screen map of your brain, so the surgeon always knows exactly where they are. Intra-operative monitoring listens to the electrical signals in the nerves that control movement and speech, giving the team an early warning before any critical area is disturbed. Together they help the surgeon remove as much tumour as safely possible while protecting healthy brain.
At CION Cancer Clinics, the surgery itself is coordinated with accredited neurosurgical partners, while our neuro-oncology brain tumour team plans your whole pathway — imaging, molecular testing, radiation, and supportive care — before and after the operation.
For gliomas, removing more of the tumour is linked to better outcomes — which is why maximal safe resection is a core goal in NCCN and EANO guidelines. Neuronavigation and intra-operative mapping are the tools that let surgeons push closer to that goal while sparing the brain regions that control speech and movement.
People often confuse these two technologies. They are not the same, and the best results come from using them together.
A real-time GPS for the brain. Your MRI or CT is loaded into a computer that reconstructs your exact anatomy. During surgery, tracked instruments appear on screen, showing their precise position relative to the tumour and to critical structures like blood vessels and nerve pathways. This image-guided approach helps plan the smallest safe opening, reach deep tumours accurately, and stay oriented throughout the operation.
Also called intra-operative neuromonitoring (IONM). Small electrodes track the electrical signals in nerves controlling movement, sensation, speech, hearing, and vision. As the surgeon works, the team continuously tests these pathways. If a signal starts to change, they get an early warning to adjust — before a critical function is harmed. Navigation shows the route; monitoring protects what matters most.
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Trained at AIIMS, Tata Memorial, and leading international centres. Combined 150+ years of experience. Every complex case is reviewed by 3+ of them — together.
MBBS(Gold Medal), DNB(General Medicine), DM(Medical Oncology)(Gold Medal)
MBBS, MD(General Medicine), DM(Medical Oncology)(Adyar,Chennai), ECMO, MRCP SCE(UK)
MBBS, MD (General Medicine), DrNB (Medical Oncology), ECMO, MRCP SCE (Medical Oncology) (UK)
MBBS (AIIMS), MS (Surgery) (AIIMS), DNB (Surgical Oncology), MRCS (Edinburgh)
MBBS, MS(General Surgery), M.Ch(Surgical Oncology), FMAS, FARIS(Ongoing)
MBBS, MS (General Surgery), DrNB (Surgical Oncology), FALS Oncology
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Whether you are planning surgery or want a second opinion, CION's tumour board will explain how neuronavigation and monitoring apply to your tumour — with transparent costs and no pressure to start.
Image-guided brain surgery follows a careful sequence. Understanding it can make the operation feel far less frightening.
Note: the brain can shift slightly once surgery begins ("brain shift"), so surgeons combine navigation with their own judgement and, in some centres, an intra-operative scan or ultrasound to keep the map accurate. Read more about what brain tumour surgery involves.
"Monitoring" is a family of techniques. Which ones are used depends on where the tumour sits and which functions are at risk. All are coordinated with accredited neurosurgical partners; the anaesthetic and neurophysiology teams run them alongside the surgeon.
Gentle electrical pulses are applied to the motor part of the brain, and the resulting muscle responses in the arms, legs or face are recorded. This confirms that the pathways controlling movement are still working as the surgeon operates near them. If the response starts to fade, the team is warned early and can pause or change approach — well before any lasting weakness could develop. MEP monitoring is a mainstay for tumours near the motor cortex or its connecting fibres.
A nerve in the wrist or ankle is gently stimulated, and the signal is tracked as it travels up to the brain. This checks that the pathways carrying touch and body-position sensation remain intact during surgery. SSEP is often used together with MEP to give the team a fuller picture of the sensory-motor pathways, so the surgeon knows the safe boundaries around the tumour and can protect the feeling and coordination you rely on every day.
The surgeon briefly stimulates small areas of the exposed brain or the fibres beneath it to see what each area does. If stimulating a spot causes a hand to twitch or a word to catch, the team knows that area is essential and marks it as off-limits. This is the most direct form of brain mapping and is the heart of an awake craniotomy for tumours near speech. It lets the surgeon safely work right up to the functional boundary.
For tumours in or near the language areas, the patient (kept comfortable but awake for this part) is asked to name pictures, read, or count while the surgeon stimulates the brain. If speech falters at a particular spot, that area is preserved. This live feedback cannot be replicated under general anaesthesia, which is why awake mapping is recommended when the tumour threatens language. It is the most reliable way to protect the ability to communicate.
For tumours near the hearing nerve or brainstem — such as an acoustic neuroma — clicking sounds are played into the ear and the brainstem's electrical response is recorded. This tracks the health of the hearing pathway throughout surgery. When the goal is to preserve useful hearing, this monitoring helps the surgical team recognise stress on the nerve early and adjust, giving the best chance of keeping hearing on the affected side.
Tumours near the skull base can sit close to the nerves controlling facial movement, swallowing, and eye movement. Fine electrodes placed in the relevant muscles alert the surgeon whenever these nerves are near the working area. An audible signal sounds if a nerve is stimulated, so the team can identify and protect it. This is especially important for skull-base and posterior-fossa tumours, where these nerves can be difficult to see directly.
Important: which of these are used is decided case by case by the coordinated neurosurgical and neurophysiology team, based on your tumour's exact location and the functions at risk.
When a tumour sits in or beside the "eloquent" brain — the areas controlling speech or movement — the surgical team may recommend an awake craniotomy with brain mapping. It sounds alarming, but it is well tolerated and, for the right tumour, it is the safest option.
The brain itself has no pain receptors. So after the skull is opened under sedation and local anaesthetic, you are gently brought to a comfortable, responsive state and asked to talk, name objects, or move a hand while the surgeon stimulates and maps the exposed brain. Every response guides the removal in real time. If stimulating an area disturbs speech or movement, the surgeon avoids it. You are then sedated again for closure.
Combined with neuronavigation, awake mapping lets the team remove more tumour while protecting the functions that matter most to you. Both EANO and NCCN support awake mapping for tumours in these locations. At CION, this is coordinated with accredited neurosurgical partners as part of your overall brain tumour treatment plan.
EANO and NCCN glioma guidance recommend awake language mapping for tumours in or near speech areas, because live testing during surgery protects communication more reliably than anaesthetised surgery alone. It is one reason a second opinion is worthwhile if awake mapping has not been discussed for a tumour near eloquent brain.
CION Cancer Clinics is a neuro-oncology team. We deliver the medical and radiation backbone of your care directly, and we coordinate the neurosurgery with accredited neurosurgical partners — including navigation-guided and monitored resections, stereotactic biopsy, and awake mapping. One tumour board plans the whole pathway, so nothing falls through the gaps.
When to seek a second opinion: if you have been told a tumour is inoperable, if awake mapping has not been discussed for a tumour near speech or movement, or if molecular testing has not been planned — it is worth a fresh review. Explore the full brain cancer and tumour hub, learn about brain tumour surgery, or request your free review. You can also call 18002028726.
Get a free written second opinion from CION's neuro-oncology tumour board — especially valuable if navigation, monitoring, or awake mapping has not yet been discussed for a tumour near speech or movement areas.
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Start Your Story. Book Free Consultation.Neuronavigation is a real-time GPS system for the brain. Before surgery, the team loads your MRI or CT scan into a computer that maps your exact anatomy. During the operation, a tracked pointer or the surgical instruments appear on screen, showing the surgeon precisely where they are inside the skull relative to the tumour and critical structures. This image-guided approach helps plan the smallest safe opening, reach deep tumours accurately, and protect healthy brain. At CION, neuronavigation is arranged as standard through our accredited neurosurgical partners for tumour resections and stereotactic biopsies.
They answer two different questions. Neuronavigation answers "where am I?" — it shows the surgeon their location inside the brain using your scans. Intra-operative neuromonitoring (IONM) answers "is this area doing an important job?" — it continuously tests the electrical signals in nerves controlling movement, sensation, speech, hearing, or vision while surgery proceeds. Used together, navigation guides the route and monitoring warns the team before any critical pathway is disturbed. Both are coordinated for eligible brain tumour operations at CION.
No. Neuronavigation is a guidance and mapping system that a human surgeon uses during an open or minimally invasive operation — it does not deliver radiation and it does not operate on its own. A Gamma Knife or CyberKnife delivers focused stereotactic radiosurgery without an incision, which is a separate treatment. Some centres pair navigation with robotic arms for biopsies, but the surgeon remains in control throughout. CION coordinates the right technology for your tumour with accredited neurosurgical and radiosurgery partners.
For many tumours, yes — navigation and monitoring are designed to make surgery safer, not to guarantee an outcome. Neuronavigation helps the surgeon plan a precise route and remove more tumour while sparing healthy tissue. Intra-operative monitoring gives an early warning if a nerve pathway is under strain, so the team can adjust before lasting harm occurs. Studies summarised by NCCN and EANO support maximal safe resection using these tools. Your individual risk still depends on the tumour type, size, and location — which the tumour board reviews for every patient.
When a tumour sits in or beside areas controlling speech or movement (the "eloquent" brain), the surgical team may recommend an awake craniotomy with brain mapping. You are kept comfortable and pain-free but responsive for part of the operation, so you can talk or move on request while the surgeon stimulates and maps each area. This live feedback, combined with neuronavigation, lets the team remove as much tumour as possible while protecting the functions that matter most to you. CION coordinates awake mapping with accredited neurosurgical partners when it is the safest option.
CION delivers the medical and radiation oncology backbone of brain tumour care directly — molecular testing, radiation therapy (IMRT/IGRT), imaging and diagnosis, steroid and seizure management, and supportive care. The neurosurgery itself, including navigation-guided and monitored resections, stereotactic biopsy, and awake mapping, is coordinated with accredited neurosurgical partners. Your CION tumour board plans the whole pathway, arranges the surgical technology you need, and stays with you before and after the operation. This keeps decisions focused on healing, with transparent costs and one team walking the journey with you.
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