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python3 -c " from docx import Document doc = Document('/tmp/workspace/attachments/5eba3352-9574-4987-9143-a6a66e87f053/Y3_Neuro_non-infectious_student1 (1).docx') for p in doc.paragraphs: style = p.style.name if p.style else 'None' if p.text.strip(): print(f'[{style}] {p.text}') "
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UGHE Neurology Case - Complete Answers
Question 1: Top 3 Diagnoses and Why
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| # | Diagnosis | Reasoning |
|---|---|---|
| 1 | Acute ischemic stroke (left MCA territory) - most likely | Sudden-onset expressive aphasia with right arm/leg weakness (3/5) and left facial droop. She is right-handed, so the LEFT hemisphere is language-dominant. The left MCA supplies Broca's area (inferior frontal gyrus). Hypertension (12 years) plus an irregular heart rhythm (likely AF) are major risk factors. |
| 2 | Intracerebral hemorrhage (ICH) | Also causes sudden focal neurological deficits. Long-standing hypertension is the classic risk factor for hypertensive bleeds (typically basal ganglia, thalamus). Cannot be excluded without non-contrast CT. |
| 3 | Embolic stroke from atrial fibrillation | The heart is described as "irregular" - highly suspicious for atrial fibrillation. AF allows thrombus formation in the left atrial appendage; emboli travel preferentially into the MCA territory because it receives the largest proportion of carotid flow. This may overlap with diagnosis #1 (the mechanism behind the ischemic stroke). |
Key point: CT head without contrast is the first-line imaging - it rules out hemorrhage immediately. If negative, the diagnosis shifts to ischemic stroke and time-to-treatment (tPA window) becomes urgent.
Question 2: Compare and Contrast Stroke Syndromes
Table A: Mechanism & Clinical Features
| Feature | Intracerebral Hemorrhage | Ischemic - Thrombotic | Ischemic - Embolic |
|---|---|---|---|
| Basic mechanism | Rupture of a cerebral blood vessel; blood accumulates within brain tissue | Thrombus forms over an atherosclerotic plaque within a cerebral artery, causing progressive occlusion | Embolus forms elsewhere (heart, aorta, carotid) and lodges in a distal cerebral artery |
| Typical onset | Sudden; often worsens over minutes-hours as hematoma expands | May be gradual or "stuttering" - symptoms can fluctuate or build over hours | Abrupt, often maximal at onset (the embolus arrives all at once) |
| Headache | Common and often severe ("worst headache") | Usually absent or mild | Usually absent |
| Vomiting | More common (raised ICP) | Less common | Less common |
| Level of consciousness | More likely impaired, especially with large hemorrhage or intraventricular extension | Usually preserved unless massive infarction | Usually preserved initially |
| Neurological deficits | Focal + mass effect; hemiparesis, aphasia, visual deficits; often severe | Focal deficits matching the vascular territory | Focal cortical deficits (aphasia, visual field cut, neglect) matching the artery |
| Major risk factors | Chronic hypertension, cerebral amyloid angiopathy, anticoagulation, AVM | Atherosclerosis, hypertension, diabetes, hyperlipidemia, smoking, older age | Atrial fibrillation, recent MI, valvular disease (mitral stenosis), ventricular thrombus |
| Typical locations | Basal ganglia, thalamus, pons, cerebellum (hypertensive); lobar (amyloid angiopathy) | Large cerebral arteries (MCA, ACA); can cause lacunar infarcts in small penetrating vessels | MCA most common (receives ~80% of ICA flow); any artery possible |
| CT imaging | Hyperdense (bright white) blood immediately visible | Normal initially; may show subtle early ischemic signs (loss of gray-white differentiation, dense MCA sign) | Normal initially; infarction appears as hypodensity after 6-24 hours |
| Classic example | Hypertensive patient with sudden headache, vomiting, hemiparesis, declining consciousness | Patient with known carotid stenosis develops gradually worsening unilateral limb weakness | Patient with known AF suddenly develops aphasia and hemiplegia - as in this case |
Table B: Presentation / Risk Factors / Associated Conditions (for the blank student table)
| Presentation | Risk factors | Associated conditions | |
|---|---|---|---|
| Intracerebral hemorrhage | Sudden severe headache, nausea/vomiting, focal deficits, decreased consciousness; may worsen rapidly | Hypertension (most common), anticoagulant use, amyloid angiopathy, AVM, cocaine/stimulants | Hypertension, coagulopathy, cerebral amyloid angiopathy (elderly), AVMs |
| Ischemic (thrombotic) | Focal deficits in a vascular territory; may be preceded by TIA; onset can be stuttering; often on waking | Atherosclerosis, hypertension, diabetes mellitus, dyslipidemia, smoking, older age | Carotid artery disease, coronary artery disease, peripheral vascular disease, metabolic syndrome |
| Ischemic (embolic) | Abrupt onset, often maximal at onset; cortical signs prominent (aphasia, neglect, hemianopia); may have sudden improvement (lysis) | Atrial fibrillation, valvular disease, recent MI, dilated cardiomyopathy, endocarditis | Atrial fibrillation, structural heart disease, deep vein thrombosis (paradoxical embolism via PFO) |
Question 3: Bell's Palsy vs. Stroke on Physical Exam
The single most important distinction is forehead sparing.
The Neuroanatomical Basis
The upper face (forehead/frontalis) receives bilateral cortical input - both the ipsilateral AND contralateral motor cortex project to the upper facial nucleus in the pons. The lower face receives input predominantly from the contralateral cortex only.
-
Stroke (Upper Motor Neuron lesion): Damages the cortex or internal capsule on one side. The forehead is spared because the intact opposite hemisphere can compensate. Weakness is confined to the lower face contralateral to the lesion. The patient can still wrinkle their forehead and raise their eyebrow on the weak side.
-
Bell's Palsy (Lower Motor Neuron lesion): Damages CN VII (the facial nerve) itself, after it exits the facial nucleus. ALL branches are affected. Weakness involves the entire ipsilateral face - forehead AND lower face. The patient cannot raise the eyebrow or wrinkle the forehead on the affected side. Eye closure is also impaired (risk of corneal damage).
Quick Exam Comparison Table
| Finding on Exam | Stroke (UMN) | Bell's Palsy (LMN) |
|---|---|---|
| Forehead wrinkle (raise eyebrow) | Preserved on affected side | Absent - cannot wrinkle forehead |
| Eye closure | Mild weakness; can usually close eye | Incomplete eye closure (lagophthalmos) |
| Lower face droop | Present (contralateral to lesion) | Present (ipsilateral to nerve lesion) |
| Tongue deviation | May be present (CN XII involvement) | Not affected |
| Other neurological signs | Often present: arm/leg weakness, aphasia, sensory loss | Absent (pure facial nerve lesion) |
| Hyperacusis | Absent | May be present (stapedius weakness) |
| Taste loss (anterior 2/3 tongue) | Absent | May be present (chorda tympani) |
| Ear pain (retroauricular) | Absent | Common early symptom |
Clinical rule: If the patient can wrinkle their forehead on the "drooping" side → think stroke (UMN). If they cannot wrinkle the forehead → think Bell's Palsy or other LMN lesion (CN VII peripheral lesion).
Source: Neuroanatomy through Clinical Cases, 3rd Ed., Fig. 12.13; Goldman-Cecil Medicine, Fig. 306-6
Question 4: Artery Occlusion → Symptoms
4a. Behavior changes, left lower leg weakness → Anterior Cerebral Artery (ACA)
Bonus - Which side? RIGHT ACA
- The ACA supplies the medial surface of the frontal and parietal lobes (the "parasagittal" cortex) - this includes the motor and sensory homunculus for the leg.
- Left lower leg weakness → lesion in the right hemisphere (contralateral control).
- The frontal lobe is also the seat of executive function and personality; ACA strokes (especially bilateral or involving the anterior communicating artery) cause abulia, disinhibition, and personality/behavior changes.
- Arm and face are usually spared or minimally affected because they are represented more laterally (supplied by MCA).
4b. Vision loss → Posterior Cerebral Artery (PCA)
- The PCA supplies the occipital lobe (primary visual cortex, V1) and the inferior temporal lobe.
- Occlusion causes contralateral homonymous hemianopia (loss of the same half of the visual field in both eyes) because the visual cortex processes the contralateral visual field.
- It is the classic "stroke you can miss" - patients may not notice or just report "blurry vision." Always check visual fields formally.
- Source: Harrison's Principles, 22nd Ed.; Adams and Victor's Principles of Neurology: "occlusion of the posterior cerebral artery causes loss of vision in both eyes in the half of the retina on the opposite side."
4c. Headache, nystagmus, slurred speech → Basilar Artery (posterior circulation / vertebrobasilar)
- The basilar artery supplies the brainstem (pons, midbrain) and cerebellum via the AICA and PICA branches.
- Nystagmus - brainstem/cerebellar vestibular pathways.
- Dysarthria (slurred speech) - cranial nerve nuclei in the pons and cerebellar connections.
- Headache - common in posterior circulation strokes; severe headache + posterior signs should raise suspicion for basilar artery stroke or vertebral artery dissection.
- Additional posterior circulation signs: vertigo, diplopia, dysphagia, ataxia, crossed deficits (ipsilateral face + contralateral body), "locked-in syndrome" with basilar occlusion.
4d. Right facial droop, right arm weakness → Left Middle Cerebral Artery (MCA)
- The MCA supplies the lateral cortex including: motor strip (face, arm, hand > leg), sensory strip, and in the dominant hemisphere - language areas (Broca's area anteriorly, Wernicke's area posteriorly).
- Motor control is contralateral - so RIGHT face and arm weakness = LEFT hemisphere lesion.
- The face and arm are affected more than the leg because they are represented laterally on the cortex (MCA territory), while the leg is medial (ACA territory).
- This is exactly the presentation of the patient in this case: left MCA stroke causing right-sided face + arm weakness and aphasia.
Summary Table - Question 4
| Symptoms | Artery | Side of Occlusion |
|---|---|---|
| Behavior changes + left lower leg weakness | Anterior Cerebral Artery (ACA) | Right ACA |
| Vision loss | Posterior Cerebral Artery (PCA) | Contralateral to the visual field deficit |
| Headache + nystagmus + slurred speech | Basilar Artery | N/A (midline/bilateral brainstem) |
| Right facial droop + right arm weakness | Middle Cerebral Artery (MCA) | Left MCA |
Sources: Goldman-Cecil Medicine 2-vol set; Neuroanatomy through Clinical Cases, 3rd Ed.; Harrison's Principles of Internal Medicine 22E; Adams and Victor's Principles of Neurology, 12th Ed.; Tintinalli's Emergency Medicine.
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