Arteriovenous Malformations: Difference between revisions
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== Other Presentations == | == Other Presentations == | ||
* Neurological deficits: Possibly due to steal phenomenon, microhemorrhages, mass effect. | * Neurological deficits (<10%): Possibly due to steal phenomenon, microhemorrhages, mass effect. | ||
* Headaches: May be due to meningeal artery involvement or venous outflow obstruction. | * Headaches: May be due to meningeal artery involvement or venous outflow obstruction. | ||
= Old presentation = | = Old presentation = | ||
Revision as of 01:04, 3 March 2024
Definition
- Fistulous connections b/w cerebral arteries & veins w/o a nml capillary bed.
Clinical Presentation
- Up to 40% present w/ unrelated Sx.
- The remainder w/ Sx related to the AVM (focal deficit, H/A, sz
- These Sx may be assoc. w/ hemorrhage, mechanical compression, irritation
- Medical attention in 50% due to ruptured AVM w/ hemorrhage (intraparenchymal MC, IVH, SDH, or SAH)
Subgroups of Presentation - Ruptured, Unruptured ( ± w/ microhemorrhages)
Hemorrhagic Presentation
- Risk factors: Small size, deep location, exclusive deep venous drainage, and association with aneurysms.
- R2eD AVM score as a predictive tool.
- Significant morbidity and mortality associated with initial hemorrhage.
Seizures as a Presentation
- 15%–35% of initial presentation.
- Common in supratentorial AVMs.
- Related to hemorrhage, mass effect, or flow characteristics.
- Risk factors: Superficial location, large nidus, cortical location.
Other Presentations
- Neurological deficits (<10%): Possibly due to steal phenomenon, microhemorrhages, mass effect.
- Headaches: May be due to meningeal artery involvement or venous outflow obstruction.