Avm Nidus
Avm Nidus - Related Videos
14:58
Comprehensive Endovascular and Open Surgical Management of Cerebral Arteriovenous Malformations
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Cited by 4 •
2017
Surgery is the gold standard for accessible arteriovenious malformations (AVMs), and pre-operative embolization can simplify this procedure. We describe our approach for staged endovascular embolization and open resection of AVMs, and provide a representative clinical example highlighting the advantages of a comprehensively trained neurovascular surgeon leading a multi-disciplinary clinical team.
07:25
Open Surgical Resection of Cerebral Arteriovenous Malformations
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2025
Source: Rennert, R. C., et al. Comprehensive Endovascular and Open Surgical Management of Cerebral Arteriovenous Malformations. J. Vis. Exp. (2017).This video demonstrates the open surgical resection of a cerebral arteriovenous malformation (AVM) in a human brain. The procedure involves creating a bone flap, accessing the subarachnoid space, identifying and occluding feeding arteries and draining veins, and carefully removing the AVM. Intraoperative angiography confirms complete resection,...
FAQs
The nidus maintains a direct high-flow connection between arterial and venous sides, so draining veins receive pressure and flow that a normal capillary bed would usually moderate. This altered hemodynamic environment can promote nidus enlargement and change blood distribution in surrounding brain tissue. These effects help explain why the lesion may produce neurological symptoms even before rupture.
Each vascular component has a different role in the abnormal circulation. Feeding arteries deliver blood, the nidus contains the central shunt, and draining veins carry blood away. Separating these structures on imaging allows researchers and clinicians to characterize the lesion more accurately, evaluate its vascular architecture, and plan an intervention that addresses the nidus rather than an adjacent vessel.
Its significance arises from the combination of abnormal vessel connections, altered cerebral blood flow, and exposure of draining veins to arterial pressure. The nidus may enlarge, disturb nearby circulation, or rupture and cause intracranial hemorrhage. Studying these mechanisms helps connect vascular architecture with neurological symptoms and supports assessment of hemorrhage risk.
Angiography is used to visualize the abnormal vascular arrangement and distinguish the nidus from its arterial feeders and venous drainers. Related imaging can contribute to locating the lesion and characterizing its relationship to surrounding cerebral circulation. This evaluation provides the anatomical information needed to assess hemorrhage risk and determine whether treatment planning should focus on surgery, embolization, or radiosurgery.
Once the nidus and its connections are characterized, the findings can guide microsurgery, endovascular embolization, or stereotactic radiosurgery. The overview supports these as distinct management approaches directed by the lesion's vascular anatomy. Accurate localization is therefore important because treatment planning depends on separating the nidus from feeding arteries and draining veins rather than treating the surrounding vessels indiscriminately.
In neuroscience, the nidus provides a focal structure for studying how abnormal vascular architecture affects cerebral blood flow and neurological function. Imaging-based analysis can relate its size, location, and vascular connections to hemorrhage risk or symptoms. This makes the nidus relevant both to cerebrovascular investigation and to the design of procedures intended to reduce risks from the malformation.