CVA ISCHEMIC STROKE with right hemiparesis most common site of infarct in brain
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ischemic stroke middle cerebral artery territory contralateral hemiparesis Merck Manual
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Right hemiparesis from an ischemic CVA most commonly indicates a left middle cerebral artery (MCA) territory infarct, affecting the contralateral motor cortex/corticospinal pathways.
- Typical MCA deficit: weakness of face and arm more than leg
- If the lesion is a small deep infarct producing relatively pure motor hemiparesis, a common site is the left internal capsule, supplied by lenticulostriate branches of the MCA.
- If weakness is leg more than arm, consider a left anterior cerebral artery (ACA) infarct instead.
This localization is consistent with Merck's stroke syndrome table. Textbook support: Bradley and Daroff's Neurology in Clinical Practice, section “Subcortical Lesions,” lines 4337-4340.
Create a quick-reference table for stroke localization
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Merck Manual stroke localization middle cerebral artery anterior cerebral artery posterior cerebral artery vertebrobasilar symptoms
Stroke Localization Quick-Reference Table
| Clinical pattern | Likely site / vascular territory | Key localizing clues |
|---|---|---|
| Contralateral face and arm weakness > leg | Middle cerebral artery (MCA) | Often sensory loss; gaze preference toward lesion; homonymous hemianopia |
| Right hemiparesis + aphasia | Left MCA, dominant hemisphere | Broca aphasia if superior division; Wernicke aphasia if inferior division |
| Left hemiparesis + neglect | Right MCA, nondominant hemisphere | Left hemispatial neglect, anosognosia |
| Contralateral leg weakness > arm | Anterior cerebral artery (ACA) | Abulia/apathy, urinary incontinence, gait apraxia |
| Contralateral homonymous hemianopia with little weakness | Posterior cerebral artery (PCA), occipital cortex | May have visual hallucinations; macular sparing can occur |
| Contralateral hemianopia + memory impairment or thalamic signs | PCA territory | Medial temporal lobe or thalamic involvement |
| Pure motor hemiparesis without aphasia, neglect, or visual-field loss | Lacunar infarct, commonly posterior limb of internal capsule or pons | Usually affects face, arm, and leg similarly; lenticulostriate small-vessel disease |
| Pure sensory stroke | Thalamic lacune | Contralateral hemisensory loss |
| Ataxia + weakness on same side of body | Lacunar stroke involving pons/internal capsule | Ataxic hemiparesis |
| Dysarthria + clumsy hand | Pontine or capsular lacune | No cortical signs |
| Vertigo, diplopia, dysarthria, dysphagia, nystagmus, ataxia | Posterior circulation: brainstem/cerebellum, vertebrobasilar system | Think stroke even without limb weakness |
| Ipsilateral cranial-nerve signs + contralateral limb weakness/sensory loss | Brainstem: pons or medulla | “Crossed” findings are a brainstem clue |
| Severe ataxia, vomiting, headache, inability to stand/walk | Cerebellar infarct | Can deteriorate due to posterior fossa edema |
| Coma, quadriplegia, locked-in syndrome | Basilar artery occlusion | Emergency large-vessel posterior-circulation stroke |
| Monocular transient visual loss or blindness | Ipsilateral carotid/ophthalmic artery | Amaurosis fugax suggests retinal ischemia |
| Bilateral leg weakness, abulia, incontinence | Bilateral ACA | Consider anterior communicating artery region |
High-yield rule:
- Face/arm > leg = MCA
- Leg > face/arm = ACA
- Visual field deficit = PCA or posterior MCA
- No cortical signs + pure motor/sensory deficit = lacunar/internal capsule
- Crossed signs, diplopia, dysphagia, severe vertigo/ataxia = posterior circulation/brainstem
Any sudden focal neurological deficit should be treated as a stroke emergency and needs immediate emergency assessment. The major arterial patterns above align with the Merck stroke syndromes table. Textbook support: Neuroanatomy through Clinical Cases, section “Clinical Syndromes of the Three Cerebral Arteries,” line 5910; Bradley and Daroff’s Neurology in Clinical Practice, section “Subcortical Lesions,” lines 4337-4340.
Frontal lobe infarct features
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frontal lobe stroke features abulia Broca aphasia gaze deviation Merck Manual
Frontal Lobe Infarct: Clinical Features
| Area involved | Typical features |
|---|---|
| Primary motor cortex, precentral gyrus | Contralateral upper motor neuron weakness, often face/arm predominant with lateral frontal involvement (MCA); leg-predominant with medial frontal involvement (ACA) |
| Frontal eye field | Conjugate gaze deviation toward the side of the lesion in an acute destructive stroke |
| Dominant inferior frontal gyrus, Broca area | Broca aphasia: nonfluent, effortful, reduced speech output; comprehension relatively preserved; repetition impaired |
| Medial frontal lobe / supplementary motor area | Abulia, reduced spontaneous movement and speech, akinesia, impaired initiation; sometimes transcortical motor aphasia |
| Orbitofrontal cortex | Disinhibition, impulsivity, socially inappropriate behavior, poor judgment, emotional lability |
| Dorsolateral prefrontal cortex | Executive dysfunction: impaired planning, attention, working memory, problem solving, and mental flexibility |
| Medial frontal micturition area | Urinary urgency or incontinence, especially in ACA infarction |
| Frontal release circuits | Grasp reflex, paratonia/gegenhalten; bilateral lesions may cause sucking and rooting reflexes |
| Bilateral medial frontal lobes | Akinetic mutism, severe abulia, paraparesis/paraplegia, incontinence, personality change |
Vascular correlation
- ACA infarct: medial frontal lobe involvement produces contralateral leg weakness greater than arm weakness, abulia, grasp reflex, gait apraxia, and urinary incontinence.
- Superior-division MCA infarct: lateral frontal lobe involvement produces contralateral face/arm weakness, gaze deviation, and, in the dominant hemisphere, Broca aphasia.
- Bilateral ACA infarction: may cause profound abulia or akinetic mutism with bilateral leg weakness and incontinence.
Exam shortcut:
Frontal infarct = weakness + gaze preference + executive/behavioral change.
Add leg-predominant weakness and abulia for ACA territory; add face-arm weakness and Broca aphasia for dominant superior MCA territory.
Frontal infarct = weakness + gaze preference + executive/behavioral change.
Add leg-predominant weakness and abulia for ACA territory; add face-arm weakness and Broca aphasia for dominant superior MCA territory.
Textbook support: Neuroanatomy through Clinical Cases, “Anterior Cerebral Artery,” line 5949; Localization in Clinical Neurology, “ACA Syndrome,” lines 4954-4956; Bradley and Daroff’s Neurology in Clinical Practice, “Bedside Features of Broca Aphasia,” lines 718-723. The Merck description of frontal-lobe dysfunction also summarizes motor, motivational, and language deficits by frontal subregion.
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