Term
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Definition
| crescent shaped collection of blood on head CT-scan. It is caused by the rupture of bridging veins that connect to the superior sagittal sinus in blunt trauma or jarring often in shaken children and the elderly. These hematomas can cross suture lines. |
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Term
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Definition
| typically arise from head trauma, which involves rupture of the middle meningeal artery, often resulting from a temporal skull fracture. On head CT, their appearance is lens shaped (bi-convex). They cannot cross suture lines. Symptoms of mental status change are often preceded by a lucid interval. |
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Term
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Definition
| Rupture of an aneurysm and bifurcations of arteries. A/w Marfan's, Ehlers-Danlos, ADPKD, or an AVM. Rapid time course leading to sudden, severe headache. Bloody or yellow (xanthochromic) spinal tap. Risk of vasospasm 2-3 days afterwards due to blood breakdown. |
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Term
| Intraparenchymal Hemorrhage |
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Definition
| Most commonly caused by systemic hypertension, but also amyloid angiopathy, vasculitis, and neoplasm. Typically occurs in basal ganglia and internal capsule, but can be lobar. Can also be caused by Charcot-Bouchard aneurysms |
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