Educational content from recorded physician discussions — not medical advice. Always talk to your child's care team about your child's situation.
Content of this collection
Core Concepts and Techniques
6 items
Stereotactic Principles3 items
Functional Neurosurgery Explained: 1mm Matters in DBS | Amr Moursi posted on the topic
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1 millimetre. That can be the difference in DBS between therapeutic and side effects In functional neurosurgery, precision is not a goal. It is the treatment itself. 🎙️ Episode 1 of my new video series is now live: "Functional Neurosurgery,
article · Jul 2026
Finding 1mm in the Brain | Functional Neurosurgery Explained – Episode 1
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How do brain surgeons find a deep target only a few millimetres wide, buried more than 10 cm inside the brain – and hit it with less than 1 mm error?
Welcome to Episode 1 of “Functional Neurosurgery, Explained”.
In this episode, I break d
video · Jul 2026
The Geometry of Precision | Frames in DBS – Functional Neurosurgery Explained – Episode 2
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How do brain surgeons turn the head into a stable 3D coordinate system so we can place a DBS electrode within 1 mm of the target?
Welcome to Episode 2 of “Functional Neurosurgery, Explained”.
In this episode, I break down the core tools t
video · Jul 2026
Neuromodulation Fundamentals2 items
Neuromodulation vs. Neuroablation | Functional Neurosurgery Explained – Episode 3
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Why did brain surgeons stop destroying tissue to treat Parkinson's disease — and what do they do instead?
Welcome to Episode 3 of "Functional Neurosurgery, Explained".
In this episode, I trace the full evolution from neuroablation to neur
video · Jul 2026
How Electrical Stimulation Changes Brain Circuits | Functional Neurosurgery Explained – Episode 4
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When you switch on deep brain stimulation — what actually happens inside the brain?
Welcome to Episode 4 of "Functional Neurosurgery, Explained."
In this episode, I use S‑T‑N D‑B‑S in Parkinson's disease as a model to trace exactly what a
video · Jul 2026
Surgical Timing and Decision-Making1 item
The Surgical Window: Why Timing Matters as Much as Skill | Functional Surgery Minute #05
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In neurosurgery, there's a right moment to operate — not too early, not too late. We call it the surgical window. From lumbar disc prolapse to Parkinson's and DBS, here's why timing can decide whether surgery changes a life or causes harm.
video2:03 · Jul 2026
Movement Disorders
4 items
Parkinson's Disease3 items
3 Eras of Parkinson's Surgery: Destroy → Modulate → Respond
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From ablation, to DBS (Grenoble 1987), to adaptive stimulation that reads the brain's beta oscillations in real time. One section from Episode 3 of Functional Neurosurgery Explained — full episode: https://www.rfr.bz/yd06ce5f5 #shorts
video2:08 · Jul 2026
Awake DBS: Why We Test the Patient in Real Time | Functional Surgery Minute #03
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In awake deep brain stimulation for Parkinson's, the target isn't found on a scan — it's found in the patient, awake on the table. Here's how intra-operative testing guides us to the optimal stimulation depth, and why the whole team (and th
video1:38 · Jul 2026
Decoding DBS Target Selection in Parkinson's Disease | Functional Neurosurgery Explained – Episode 5
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#Parkinsons #neurosurgery #DBS
More than thirty percent of all D‑B‑S failures trace back to one mistake — the wrong patient, or the wrong target, chosen long before the operation even began. Welcome to Episode 5 of "Functional Neurosurgery,
video · Jul 2026
Exam Preparation1 item
Movement Disorder Exam Questions for Neurosurgeons | MCQs, Concepts and Key Topics
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Preparing for functional neurosurgery exam questions can be challenging, especially when the subject includes movement disorders, patient selection, surgical targets, stimulation, and clinical decision-making.
In this new series, we will g
video9:40 · Jul 2026
Epilepsy Surgery
2 items
Clinical Evaluation and Outcomes1 item
Epilepsy Surgery Outcomes Explained 🧠
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How do surgeons evaluate outcomes after epilepsy surgery?
The Engel Classification provides a standard framework for describing postoperative seizure outcomes. In this short reel, I break down its key categories simply and quickly.
#
video2:16 · Jul 2026
Exam Preparation1 item
Epilepsy Exam Questions for Neurosurgeons | MCQs, Concepts and Key Topics - part 1 out 3
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Epilepsy surgery has a reputation for being one of the hardest functional topics in the exam.
It is not impossible—it is simply long.
The best way to understand it is to follow the same structure used when working up a real patient:
Diag
video · Jul 2026
Advanced Techniques
1 item
Laser Interstitial Thermal Therapy1 item
How LITT Reaches Deep Brain Tumours Through a 3-mm Hole | Functional Surgery Minute #04
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We used to open the skull to reach deep brain tumours. LITT — Laser Interstitial Thermal Therapy — reaches them through a tiny burr hole, guided by a real-time MRI thermal map, without cutting through healthy brain. Here's how it works, wha
video2:18 · Jul 2026
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Key points, with the moment each was said+ Show
Featured picks for families are being prepared — the summaries above are written for you.
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Functional neurosurgery encompasses movement disorders, pain, and epilepsy, with epilepsy surgery being particularly challenging . Epilepsy diagnosis requires two seizures and failure of two appropriate drugs before surgical referral [e13622-c3, e13622-c4]. Characteristic EEG patterns aid diagnosis: absence epilepsy shows 3 Hz spike-and-wave, Lennox-Gastaut 1.5-2.5 Hz, and juvenile myoclonic 4-6 Hz polyspike-and-wave [e13622-c5, e13622-c6, e13622-c7]. Outcomes follow the Engel classification, grading proximity to seizure freedom rather than counting events . For Parkinson's disease, bradykinesia is mandatory for diagnosis . DBS has replaced ablative lesions because stimulation is reversible and adjustable [e13628-c3, e13628-c6]. STN is first-line, GPi for dyskinesia-dominant cases, and Vim for tremor [e13623-c9, e13623-c11, e13623-c12]. Inclusion requires >5 years disease, meaningful levodopa response (≥30%), and disabling fluctuations; exclusions include dementia, untreated psychiatric disease, and atypical parkinsonism [e13623-c14, e13623-c15, e13632-c5]. The levodopa challenge predicts DBS response [e13623-c16, e13623-c17]. Timing is critical: operating when medication fails but before cognitive decline optimizes outcomes [e13627-c9, e13627-c11]. More than 30% of DBS failures stem from wrong patient or target selection . Adaptive closed-loop systems monitoring pathological beta oscillations represent the field's future [e13628-c8, e13628-c10, e13628-c11].
- Epilepsy surgery candidacy requires two seizures, two failed drugs, and follows Diagnose-Investigate-Operate structure; outcomes use Engel classification grading seizure freedom proximity. [e13622-c2, e13622-c3, e13622-c4, e13625-c4]
- DBS replaced ablative lesions because stimulation is reversible and adjustable; STN is first-line, GPi for dyskinesia, Vim for tremor-dominant cases. [e13628-c3, e13628-c6, e13623-c9, e13623-c11, e13623-c12]
- Levodopa response ≥30% predicts DBS outcome; atypical parkinsonism, dementia, and untreated psychiatric disease are absolute contraindications. [e13632-c5, e13623-c17, e13623-c15, e13623-c18]
- Optimal DBS timing is when medication fails with disabling fluctuations but before cognitive decline; delay until dopamine non-response causes harm. [e13627-c9, e13627-c11]
- Over 30% of DBS failures trace to wrong patient or target selection; adaptive closed-loop systems monitoring beta oscillations represent the future. [e13632-c1, e13628-c8, e13628-c11]
For patients & families
Functional neurosurgery treats conditions like epilepsy, Parkinson's disease, and tremor by working on circuits deep inside the brain . Doctors use a careful process to decide who might benefit: they confirm the diagnosis, check how the patient responds to medication, and make sure the timing is right [e13632-c3, e13627-c2]. For Parkinson's, surgery works best when tremor becomes uncontrolled and medication stops working well, but before thinking or memory decline too much [e13627-c9, e13627-c11]. The most common procedure, deep brain stimulation (DBS), places a thin wire into a specific brain area—usually the subthalamic nucleus—and sends gentle electrical pulses that calm overactive circuits [e13623-c9, e13633-c2]. Unlike older operations that destroyed tissue permanently, DBS can be adjusted or turned off [e13628-c3, e13628-c6]. For epilepsy, doctors first try two appropriate medications; if seizures continue, they may consider surgery after careful testing . Success is measured by how close the patient gets to being seizure-free . Timing matters enormously: operating too early means unnecessary risk, but waiting too long can mean a lost chance to help [e13627-c3, e13627-c4, e13627-c7].
Functional neurosurgery treats conditions like epilepsy, Parkinson's disease, and tremor by working on circuits deep inside the brain . Doctors use a careful process to decide who might benefit: they confirm the diagnosis, check how the patient responds to medication, and make sure the timing is right [e13632-c3, e13627-c2]. For Parkinson's, surgery works best when tremor becomes uncontrolled and medication stops working well, but before thinking or memory decline too much [e13627-c9, e13627-c11]. The most common procedure, deep brain stimulation (DBS), places a thin wire into a specific brain area—usually the subthalamic nucleus—and sends gentle electrical pulses that calm overactive circuits [e13623-c9, e13633-c2]. Unlike older operations that destroyed tissue permanently, DBS can be adjusted or turned off [e13628-c3, e13628-c6]. For epilepsy, doctors first try two appropriate medications; if seizures continue, they may consider surgery after careful testing . Success is measured by how close the patient gets to being seizure-free . Timing matters enormously: operating too early means unnecessary risk, but waiting too long can mean a lost chance to help [e13627-c3, e13627-c4, e13627-c7].
The doctors in this collection+ Show
All expert statements+ Show
Every expert statement below comes from the recorded discussions, with its speaker and moment.
3 Eras of Parkinson's Surgery: Destroy → Modulate → Respond
Thalamotomy in the VIM silences tremor.
Host summaryThe host summarizing a resource — not the host's own clinical position0:23 ↗
Pallidotomy in the GPi eases rigidity, slowness, and dyskinesias.
Host summaryThe host summarizing a resource — not the host's own clinical position0:27 ↗
Ablative lesions are permanent and cannot be undone or adjusted as the disease progresses.
Host summaryThe host summarizing a resource — not the host's own clinical position0:33 ↗
In 1987 in Grenoble, Benabbi switched on high frequency stimulation above 100 hertz, and the tremor vanished instantly, reversibly.
Host summaryThe host summarizing a resource — not the host's own clinical position0:48 ↗
Stimulating the STN produced the same benefit as destroying it, so the benefit was never about the tissue.
Host summaryThe host summarizing a resource — not the host's own clinical position1:01 ↗
With DBS, the structure stays intact and the surgeon can adjust amplitude, frequency, pulse width, and treat both sides safely.
Host summaryThe host summarizing a resource — not the host's own clinical position1:08 ↗
The early STEM trial confirmed DBS beat medical therapy on quality of life.
Host summaryThe host summarizing a resource — not the host's own clinical position1:17 ↗
Adaptive DBS devices record local field potentials from the STN, watching for pathological beta oscillations.
Host summaryThe host summarizing a resource — not the host's own clinical position1:27 ↗
Pathological beta oscillations are a 13 to 30 Hz rhythm that suppresses movement.
Host summaryThe host summarizing a resource — not the host's own clinical position1:36 ↗
When beta appears, stimulation fires; when it fades, it eases off.
Host summaryThe host summarizing a resource — not the host's own clinical position1:40 ↗
Adaptive DBS results in less unnecessary current, longer battery life, and fewer side effects.
Host summaryThe host summarizing a resource — not the host's own clinical position1:45 ↗
How LITT Reaches Deep Brain Tumours Through a 3-mm Hole | Functional Surgery Minute #04
Hypothalamic hamartoma sits surrounded by the optic chiasm, the pituitary stalk, the mammillary bodies, and perforating vessels.
Host summaryThe host summarizing a resource — not the host's own clinical position0:15 ↗
Traditional open approach to hypothalamic hamartoma meant splitting fissures, retracting the frontal lobe, working millimeter by millimeter around structures that could not be touched.
Host summaryThe host summarizing a resource — not the host's own clinical position0:28 ↗
Open series for hypothalamic hamartoma reported complications in more than half of patients.
Host summaryThe host summarizing a resource — not the host's own clinical position0:40 ↗
LITT uses a stereotactic bolt through a 3 millimeter burr hole, robotically guided, with a laser catheter advanced to the target inside the MRI scanner.
Host summaryThe host summarizing a resource — not the host's own clinical position0:51 ↗
Real-time thermal map shows the ablation expanding second by second during LITT.
Host summaryThe host summarizing a resource — not the host's own clinical position1:07 ↗
Safety markers are placed next to the optic tract and the fornix, and ablation is stopped the moment heat approaches them.
Host summaryThe host summarizing a resource — not the host's own clinical position1:13 ↗
Across published hamartoma series, seizure freedom rates are 56 to 84%.
Host summaryThe host summarizing a resource — not the host's own clinical position1:22 ↗
Hospital stay for LITT is just overnight.
Host summaryThe host summarizing a resource — not the host's own clinical position1:28 ↗
LITT requires no craniotomy, just a small scalp incision.
Host summaryThe host summarizing a resource — not the host's own clinical position1:32 ↗
LITT is expanding to mesial temporal epilepsy, insular cavernoma, and periventricular heterotopia.
Host summaryThe host summarizing a resource — not the host's own clinical position1:36 ↗
LITT works from inside the lesion, leaving the healthy brain overlying untouched.
Host summaryThe host summarizing a resource — not the host's own clinical position1:58 ↗
Epilepsy Exam Questions for Neurosurgeons | MCQs, Concepts and Key Topics - part 1 out 3
Epilepsy surgery is one of the hardest functional topics in the exam
opinion0:00 ↗
The best way to understand epilepsy surgery is to follow the structure: Diagnose, Investigate, Operate
opinion0:00 ↗
Two seizures are required to diagnose epilepsy
guideline0:00 ↗
Two failed appropriate drugs are required before referring for surgical assessment
guideline0:00 ↗
Absence epilepsy has a characteristic 3 Hz spike-and-wave pattern on EEG
clinical0:00 ↗
Lennox-Gastaut syndrome has a slow 1.5-2.5 Hz spike-and-wave pattern on EEG
clinical0:00 ↗
Juvenile myoclonic epilepsy has a 4-6 Hz polyspike-and-wave pattern on EEG
clinical0:00 ↗
West syndrome is characterized by spasms, hypsarrhythmia, and developmental regression
clinical0:00 ↗
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