Stroke vs Aneurysm on Scans: How Doctors Spot the Difference Under Pressure
By Robert Thorne
Differentiating these emergencies relies on strict radiological patterns, structural vascular changes, and the exact clinical timeline documented upon arrival.
| Diagnostic Variable | Ischemic Stroke | Ruptured Intracranial Aneurysm |
|---|---|---|
| Primary Mechanism | Thromboembolic arterial occlusion | Structural dome rupture under arterial pressure |
| Hallmark Clinical Sign | Sudden painless focal neurological deficit | Instantaneous, peak-intensity thunderclap headache |
| Non-Contrast CT Findings | Early hypoattenuation or normal scan (first 3 hours) | Hyperdense (bright white) blood in basal cisterns |
| Angiography Presentation | Abrupt vessel cutoff with downstream perfusion deficit | Saccular or fusiform vascular outpouching |
| Primary Interventions | Intravenous thrombolysis or mechanical thrombectomy | Endovascular coiling, flow diversion, or surgical clipping |
| Acute Target Window | 0, 4.5 hours (tPA); up to 24 hours (thrombectomy) | Immediate exclusion to prevent fatal rebleeding within 24 hours |
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