High yield info about strokes everything as localization types diagnose mangmant
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Stroke: high-yield study map
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Stroke basics
- Definition, ischemic vs hemorrhagic stroke, TIA
- Time-critical approach and mimics
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Vascular anatomy and localization
- ACA, MCA, PCA territories
- Lacunar syndromes
- Vertebrobasilar and brainstem stroke syndromes
- Cortical versus subcortical findings
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Clinical presentation
- Motor, sensory, language, visual, cerebellar, and cranial-nerve deficits
- Dominant versus non-dominant hemisphere findings
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Diagnosis
- ABCs, glucose, NIHSS, focused neurologic exam
- Non-contrast CT, CT angiography, CT perfusion, MRI-DWI
- ECG, vascular imaging, echocardiography, stroke-cause workup
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Acute ischemic stroke management
- Immediate stabilization and eligibility for IV thrombolysis
- Mechanical thrombectomy selection
- Antiplatelets, blood-pressure targets, glucose, temperature, swallow screening
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Intracerebral hemorrhage and subarachnoid hemorrhage
- Recognition, CT diagnosis, reversal of anticoagulation, BP management, neurosurgical indications
- SAH red flags and aneurysm workup
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Secondary prevention
- Antiplatelet versus anticoagulation
- Carotid disease, statins, hypertension, diabetes, smoking cessation, rehabilitation
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Exam tables and algorithms
- Territory localization table
- “Sudden focal deficit” diagnostic pathway
- Thrombolysis and thrombectomy contraindications
- High-yield differentiators and common traps
One-minute overview
Most strokes are ischemic and are treated as a time-dependent emergency. First determine the time last known well, stabilize airway/breathing/circulation, check capillary glucose, perform a focused neurologic examination/NIHSS, and obtain urgent non-contrast CT to exclude hemorrhage. CT angiography identifies a large-vessel occlusion that may be suitable for thrombectomy.
Localization is strongly testable: MCA strokes usually cause contralateral face/arm weakness more than leg weakness, with aphasia in the dominant hemisphere or neglect in the non-dominant hemisphere. ACA strokes predominantly affect the contralateral leg. PCA strokes cause contralateral homonymous visual-field loss. Brainstem strokes commonly produce “crossed” findings: ipsilateral cranial-nerve signs with contralateral body deficits.
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Create a stroke localization comparison table
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Stroke Localization Comparison Table
Major cerebral arterial territories
| Territory / artery | Main area affected | Contralateral motor/sensory pattern | Cortical signs | Visual / eye signs | Key high-yield clue |
|---|---|---|---|---|---|
| MCA - Middle cerebral artery | Lateral frontal, parietal, temporal cortex; insula. Deep MCA branches supply basal ganglia and internal capsule. | Face and arm > leg weakness and sensory loss | Dominant hemisphere: aphasia. Non-dominant hemisphere: hemispatial neglect, anosognosia, impaired visuospatial function. Apraxia may occur. | Contralateral homonymous hemianopia; gaze preference toward lesion in large hemispheric stroke | Face/arm-predominant deficit + aphasia or neglect |
| MCA superior division | Lateral frontal lobe, motor cortex for face/arm | Face and arm weakness > leg; may have dysarthria | Broca aphasia if dominant side: non-fluent, effortful speech with relatively preserved comprehension | Usually no major visual field defect | Non-fluent aphasia + right face/arm weakness = left superior MCA |
| MCA inferior division | Lateral temporal and inferior parietal cortex | Weakness often minimal or absent | Wernicke aphasia if dominant side: fluent but nonsensical speech, impaired comprehension; neglect if non-dominant side | Contralateral superior quadrantanopia, “pie in the sky” | Fluent aphasia with poor comprehension, little weakness |
| ACA - Anterior cerebral artery | Medial frontal and parietal lobes, supplementary motor area, leg motor/sensory cortex, cingulate gyrus | Leg > arm/face weakness and sensory loss | Abulia, apathy, reduced spontaneous speech, impaired initiation; grasp reflex; urinary incontinence. Dominant side may cause transcortical motor aphasia. | Usually no primary visual-field deficit | Contralateral leg-predominant weakness + abulia/incontinence |
| PCA - Posterior cerebral artery | Occipital lobe, inferomedial temporal lobe; may involve thalamus or midbrain | Usually little motor weakness. Thalamic involvement can cause contralateral sensory loss. | Dominant occipital + splenium lesion: alexia without agraphia. Memory impairment may occur with medial temporal involvement. | Contralateral homonymous hemianopia, often with macular sparing | Sudden isolated visual-field loss suggests PCA stroke |
| ICA - Internal carotid artery | May affect ipsilateral retina plus MCA and/or ACA territories | Contralateral weakness/sensory loss, often severe if MCA territory is involved | Aphasia or neglect depending on hemisphere | Ipsilateral monocular vision loss (amaurosis fugax) may precede stroke; may also cause contralateral homonymous hemianopia | Monocular blindness plus contralateral hemispheric deficit |
| Anterior choroidal artery | Posterior limb of internal capsule, optic tract/radiations, parts of thalamus and basal ganglia | Contralateral hemiparesis, often dense | Usually no aphasia or neglect unless larger/adjacent infarct | Contralateral homonymous hemianopia | Classic triad: hemiplegia + hemisensory loss + homonymous hemianopia |
| Watershed / border-zone infarct | Junctions of ACA-MCA or MCA-PCA perfusion zones, often due to hypoperfusion | Proximal arm and leg weakness may predominate | Can cause language or cognitive deficits depending on side | Variable | “Man-in-the-barrel” syndrome: bilateral proximal arm weakness after severe hypotension |
Lacunar stroke syndromes
Lacunar infarcts are small deep infarcts from occlusion of a penetrating vessel, commonly involving the internal capsule, thalamus, pons, basal ganglia, or corona radiata. They usually lack cortical signs such as aphasia, neglect, gaze deviation, seizures, and visual-field deficits.
| Lacunar syndrome | Typical location | Findings | Exam clue |
|---|---|---|---|
| Pure motor hemiparesis | Posterior limb internal capsule, corona radiata, basis pontis | Contralateral weakness of face, arm, and leg without sensory or cortical deficits | Dense motor deficit but no aphasia/neglect |
| Pure sensory stroke | Thalamus | Contralateral numbness/paresthesia involving face, arm, leg, or hemibody | Sensory-only hemisyndrome |
| Sensorimotor stroke | Thalamocapsular region | Contralateral weakness plus sensory loss | Combined motor and sensory deficit, no cortical sign |
| Ataxic hemiparesis | Pons, internal capsule, corona radiata | Ipsilateral-to-weakness limb ataxia with contralateral weakness, often leg-predominant | Weakness plus marked incoordination |
| Dysarthria-clumsy hand syndrome | Basis pontis or genu of internal capsule | Dysarthria, facial weakness, clumsy hand, mild hemiparesis | Slurred speech plus hand clumsiness |
Posterior circulation and brainstem localization
| Vessel / syndrome | Main findings | Localization clue |
|---|---|---|
| PICA - lateral medullary (Wallenberg) syndrome | Ipsilateral facial pain/temperature loss; contralateral body pain/temperature loss; dysphagia, hoarseness, reduced gag; vertigo, nystagmus, ipsilateral ataxia; ipsilateral Horner syndrome | Crossed sensory findings + dysphagia/hoarseness. Motor weakness is usually absent. |
| AICA - lateral pontine syndrome | Ipsilateral facial weakness, reduced lacrimation/salivation, loss of taste anterior 2/3 tongue; vertigo, nystagmus, hearing loss; ipsilateral facial pain/temperature loss; contralateral body pain/temperature loss; ataxia | Lateral pontine symptoms plus facial paralysis and hearing loss |
| SCA - superior cerebellar artery | Ipsilateral limb and gait ataxia, dysarthria, nystagmus; contralateral pain/temperature loss may occur | Prominent cerebellar syndrome, generally no facial paralysis or hearing loss |
| Basilar artery occlusion | Quadriplegia, dysarthria/anarthria, impaired consciousness; may cause locked-in syndrome | Patient may be awake with preserved vertical eye movements but unable to speak or move limbs |
| Paramedian pontine infarct | Contralateral weakness and sensory loss; ipsilateral abducens palsy or horizontal gaze palsy may occur | “Crossed” cranial-nerve and long-tract signs |
| Midbrain infarct, Weber syndrome | Ipsilateral CN III palsy with contralateral hemiparesis | Ptosis, dilated pupil, eye “down and out” plus opposite-sided weakness |
| Thalamic infarct | Contralateral hemisensory loss; may later develop central post-stroke pain | Prominent sensory deficit, often with unpleasant burning pain later |
Fast pattern-recognition rules
| If you see... | Think... |
|---|---|
| Face/arm weakness more than leg weakness | MCA |
| Leg weakness more than face/arm weakness | ACA |
| Isolated homonymous hemianopia | PCA |
| Aphasia | Usually dominant hemisphere, commonly left MCA |
| Neglect | Usually non-dominant hemisphere, commonly right MCA |
| Pure motor or pure sensory deficit without cortical signs | Lacunar stroke |
| Vertigo, diplopia, dysarthria, dysphagia, ataxia, or crossed deficits | Posterior circulation / brainstem stroke |
| Ipsilateral cranial-nerve palsy with contralateral body weakness/sensory loss | Brainstem lesion |
| Sudden monocular visual loss | Ipsilateral retinal/optic ischemia, often ICA disease |
| Coma or rapid decline with quadriplegia | Consider basilar artery occlusion or large hemorrhage |
Memory anchors
- MCA = Mouth and Manual function: face, arm, speech, neglect.
- ACA = Ankle and Attitude: leg weakness, abulia.
- PCA = Picture: visual-field loss.
- Lacune = Local deep lesion: no cortical findings.
- Brainstem = Crossed signs: ipsilateral cranial nerve, contralateral body.
A sudden focal neurologic deficit, especially facial droop, arm weakness, speech disturbance, visual loss, severe imbalance, or reduced consciousness, is an emergency. Activate local emergency services and document the last-known-well time immediately.
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Educational labeled diagram showing three crossed brainstem stroke syndromes side by side: left lateral medullary Wallenberg syndrome, central ventral pontine Millard-Gubler syndrome, and ventral midbrain Weber syndrome. For each, show a simplified transverse brainstem section with the lesion on the left, an ipsilateral cranial nerve deficit on the left side of a face icon, and a contralateral long-tract body deficit on the right side of a body icon. Clearly label: Wallenberg - ipsilateral facial pain and temperature loss, dysphagia and hoarseness, Horner syndrome, ataxia; contralateral body pain and temperature loss. Millard-Gubler - ipsilateral facial weakness with possible abducens palsy; contralateral hemiparesis. Weber - ipsilateral oculomotor palsy, ptosis and dilated pupil; contralateral hemiparesis. Include a concise central rule: cranial nerve signs are ipsilateral, body long-tract signs are contralateral. Medical exam revision diagram.
Brainstem crossed-syndrome diagram
Core rule
A unilateral brainstem lesion often causes:
- Ipsilateral cranial-nerve signs: face and eye findings on the same side as the lesion.
- Contralateral long-tract signs: body weakness or sensory loss on the opposite side.
This is because cranial-nerve nuclei/fascicles supply the ipsilateral face, while motor and sensory pathways to the body run through the brainstem before or after crossing. Crossed cranial-nerve and body deficits are a hallmark of brainstem stroke. Bradley and Daroff's Neurology in Clinical Practice, p. 353.
| Level | Syndrome / artery | Ipsilateral findings | Contralateral findings | Fast recognition |
|---|---|---|---|---|
| Midbrain | Weber syndrome | CN III palsy: ptosis, dilated pupil, eye “down and out” | Hemiparesis, sometimes lower facial weakness | III + opposite weakness |
| Pons | Millard-Gubler syndrome | LMN facial palsy, sometimes CN VI palsy | Hemiparesis | VII + opposite weakness |
| Lateral medulla | Wallenberg syndrome, usually PICA/vertebral artery | Facial pain-temperature loss, dysphagia, hoarseness, Horner syndrome, ataxia | Body pain-temperature loss | Hoarseness/dysphagia + crossed pain-temperature loss |
| Medial medulla | Dejerine syndrome, anterior spinal artery | Tongue weakness with deviation toward lesion | Hemiparesis and impaired vibration/proprioception | XII + opposite weakness |
Exam tip
- Crossed face-body sensory loss strongly suggests a lateral brainstem lesion.
- Crossed cranial-nerve palsy plus hemiparesis suggests a medial or ventral brainstem lesion.
- Vertigo, nystagmus, diplopia, dysphagia, dysarthria, ataxia, skew deviation, or an internuclear ophthalmoplegia should raise concern for posterior-circulation stroke.
Give me like brain stim strok like this as location
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Brainstem stroke localization: learn by level + side
The key rule: “Crossed signs”
A lesion on one side of the brainstem typically produces:
- Same-side face/cranial nerve signs
- Opposite-side body weakness or sensory loss
Example: left facial weakness + right body weakness = left pontine stroke.
1. Midbrain stroke
| Location / syndrome | Vessel | Ipsilateral signs | Contralateral signs | Localization shortcut |
|---|---|---|---|---|
| Ventral midbrain: Weber syndrome | PCA perforators | CN III palsy: ptosis, dilated pupil, eye down-and-out | Hemiparesis, often lower facial weakness | CN III + opposite hemiparesis |
| Midbrain tegmentum: Benedikt syndrome | PCA perforators | CN III palsy | Tremor, choreoathetosis, ataxia, sometimes weakness | CN III + opposite tremor/ataxia |
| Dorsal midbrain | Variable | Vertical gaze palsy, convergence-retraction nystagmus, light-near dissociation | Usually no classic crossed motor syndrome | Cannot look up |
Midbrain = eye movement level.
Think: III and IV cranial nerves.
Think: III and IV cranial nerves.
2. Pontine stroke
| Location / syndrome | Vessel | Ipsilateral signs | Contralateral signs | Localization shortcut |
|---|---|---|---|---|
| Ventral caudal pons: Millard-Gubler syndrome | Basilar paramedian branches | LMN CN VII facial palsy. Sometimes CN VI palsy | Hemiparesis | Facial paralysis + opposite body weakness |
| Dorsal/tegmental pons: Foville syndrome | Paramedian pontine branches | Facial weakness plus horizontal gaze palsy toward lesion | Hemiparesis | Cannot look toward lesion + facial weakness + opposite weakness |
| Medial pons | Basilar paramedian branches | CN VI palsy or horizontal gaze palsy; may have internuclear ophthalmoplegia | Hemiparesis, sensory loss | Abduction/gaze problem + opposite weakness |
| Lateral pons: AICA syndrome | AICA | Facial weakness, reduced lacrimation/salivation, taste loss anterior 2/3 tongue, vertigo/nystagmus, hearing loss, ipsilateral facial pain-temperature loss, ipsilateral ataxia | Body pain-temperature loss | Facial palsy + hearing loss = AICA/lateral pons |
| Large ventral pons: locked-in syndrome | Basilar artery occlusion | Quadriplegia and anarthria, but consciousness and vertical eye movements may be preserved | Bilateral motor deficit | Awake, cannot speak/move, can blink/look vertically |
Pons = facial and horizontal eye movement level.
Think: VI, VII, VIII.
Think: VI, VII, VIII.
3. Medullary stroke
| Location / syndrome | Vessel | Ipsilateral signs | Contralateral signs | Localization shortcut |
|---|---|---|---|---|
| Lateral medulla: Wallenberg syndrome | Usually PICA or vertebral artery | Facial pain-temperature loss; dysphagia, hoarseness, reduced gag due to nucleus ambiguus; vertigo/nystagmus; Horner syndrome; ataxia | Body pain-temperature loss | Dysphagia/hoarseness + crossed pain-temperature loss |
| Medial medulla: Dejerine syndrome | Anterior spinal artery or vertebral paramedian branches | CN XII palsy, tongue deviates toward lesion | Hemiparesis plus loss of vibration/proprioception | Tongue deviation + opposite weakness |
| Hemimedullary syndrome | Vertebral artery proximal to PICA | Features of both medial and lateral medullary lesions | Mixed crossed motor and sensory signs | Severe combination of Wallenberg + Dejerine features |
Medulla = swallowing, voice, tongue level.
Think: IX, X, XII.
Think: IX, X, XII.
One-look comparison
| If the patient has... | Most likely location |
|---|---|
| Ptosis, dilated pupil, eye down-and-out + opposite hemiparesis | Midbrain, Weber syndrome |
| Facial paralysis + opposite hemiparesis | Ventral pons, Millard-Gubler syndrome |
| Facial paralysis + hearing loss + vertigo | Lateral pons, AICA stroke |
| Dysphagia, hoarseness, Horner syndrome + crossed pain/temperature loss | Lateral medulla, Wallenberg syndrome |
| Tongue deviates to lesion + opposite weakness | Medial medulla, Dejerine syndrome |
| Vertigo, nystagmus, diplopia, dysarthria, ataxia | Posterior circulation, often brainstem or cerebellum |
| Awake patient with quadriplegia and no speech | Basilar artery occlusion with locked-in syndrome |
Sensory pathways shortcut
| Deficit pattern | Structure / location |
|---|---|
| Ipsilateral face pain-temperature loss | Spinal trigeminal nucleus/tract, lateral pons or medulla |
| Contralateral body pain-temperature loss | Spinothalamic tract, lateral brainstem |
| Contralateral loss of vibration/proprioception | Medial lemniscus, medial brainstem |
| Contralateral motor weakness | Corticospinal tract, medial/ventral brainstem |
| Ipsilateral facial weakness | Facial nucleus/fascicle, pons |
| Ipsilateral tongue weakness | Hypoglossal nucleus/fascicle, medial medulla |
Memory sequence
- Midbrain: III, IV -> eye findings
- Pons: V to VIII -> face, horizontal gaze, hearing
- Medulla: IX, X, XII -> swallowing, voice, tongue
A brainstem stroke is strongly suggested by crossed signs, particularly an ipsilateral cranial-nerve deficit with contralateral body weakness or sensory deficit. The common posterior-circulation symptoms are vertigo, diplopia, dysarthria, dysphagia, ataxia, nystagmus, skew deviation, and altered consciousness.
What is the most Serious type of stroke
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There is no single “most serious” stroke in every case, but the most immediately life-threatening ischemic stroke is often:
Basilar artery occlusion
This blocks blood flow to the brainstem, which controls consciousness, breathing, heart function, eye movements, swallowing, and major motor pathways.
It can cause:
- Sudden vertigo, diplopia, dysarthria, dysphagia, ataxia
- Rapid decline in consciousness or coma
- Quadriplegia
- Locked-in syndrome: awake and aware but unable to speak or move, sometimes able to communicate only with vertical eye movements
It is a medical emergency needing immediate stroke-team evaluation and often thrombectomy. A review in Stroke describes basilar artery occlusion as one of the most devastating neurologic conditions, with high risks of death and severe disability (AHA review).
Other especially dangerous types:
| Stroke type | Why it is dangerous |
|---|---|
| Massive MCA infarct, “malignant MCA” | Severe swelling can shift the brain and cause herniation in the first days. May require decompressive hemicraniectomy. |
| Cerebellar infarct | Swelling in the confined posterior fossa can compress the brainstem or obstruct CSF flow, causing acute hydrocephalus and herniation. |
| Intracerebral hemorrhage | Bleeding expands or raises intracranial pressure; brainstem hemorrhage is particularly dangerous. |
| Aneurysmal subarachnoid hemorrhage | Sudden “worst headache,” possible rapid loss of consciousness and rebleeding. It has high early mortality. |
| Large hemispheric stroke with edema | Can produce coma and herniation, especially with large ICA or MCA territory involvement. |
Exam answer:
Basilar artery occlusion is among the most devastating strokes because it can infarct the pons and cause coma, quadriplegia, or locked-in syndrome.
Any sudden facial droop, weakness, trouble speaking, severe imbalance, double vision, or reduced consciousness needs emergency evaluation immediately.
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