Arteriovenous malformations (AVMs) of the brain represent one of the most complex and fascinating pathologies within the field of vascular neurosurgery. They are congenital anomalies consisting of a direct and anomalous connection between arteries and veins, without the interposition of a normal capillary bed. This structure, called the \u00abnidus,\u00bb subjects the cerebral veins to elevated arterial pressures for which they are not designed, which carries a significant risk of rupture and intracranial hemorrhage. At the Arr\u00e1ez Institute, we address this challenge through a multidisciplinary strategy that combines clinical experience with the most advanced technology.<\/p>\n\n\n\n
Although AVMs may remain asymptomatic for years, they are usually detected following an episode of cerebral hemorrhage, seizures, or chronic headaches. The risk of bleeding is estimated at 2\u20134% per year, and each hemorrhagic episode is associated with significant morbidity and mortality. Therefore, the management of these lesions requires a thorough evaluation to determine the risk-benefit balance of any intervention.<\/p>\n\n\n\n
Accurate diagnosis is the first critical step in managing an AVM. The architecture of these lesions is unique to each patient, necessitating the use of high-resolution imaging techniques to map the nidus, identify feeding arteries, and understand the venous drainage pattern.<\/p>\n\n\n\n
At Arr\u00e1ez Institute, Digital Subtraction Cerebral Angiography remains the fundamental test. This procedure allows us to visualize blood flow dynamics in real-time, identifying weak points such as aneurysms<\/a> associated with feeding arteries or stenosis in draining veins, factors that increase the risk of rupture. We complement this information with functional Magnetic Resonance Imaging (fMRI) and Tractography to evaluate the relationship of the AVM with eloquent areas of the brain responsible for language, movement, or vision.<\/p>\n\n\n\n We use standardized grading systems, such as the Spetzler-Martin scale, to categorize AVM complexity based on its size, location in critical areas, and drainage pattern. This stratification is essential for deciding whether treatment should be conservative, surgical, or a combination of various modalities.<\/p>\n\n\n\n Given the complexity of these injuries, treatment rarely relies on a single technique. At our center in M\u00e1laga, success lies in close collaboration between vascular neurosurgeons, interventional neuroradiologists, and radiosurgery specialists.<\/p>\n\n\n\n Modern treatment of AVMs is usually multimodal. Endovascular embolization is frequently used as a preliminary step before surgery or radiosurgery. Via microcatheters, liquid embolic agents (such as Onyx) are introduced to reduce blood flow within the nidus, facilitating safer surgical resection or improving radiation efficacy.<\/p>\n\n\n\n Microsurgery remains the definitive treatment for many AVMs. Under microscopic vision and with the support of intraoperative neurophysiological monitoring, Dr. Arr\u00e1ez and his team proceed with the meticulous exclusion of the feeding arteries and complete resection of the nidus, always preserving normal venous circulation in the brain.<\/p>\n\n\n\n For AVMs located in surgically high-risk or small areas, radiosurgery CyberKnife<\/a> It offers a non-invasive alternative. Radiation induces a biological response that causes the abnormal vessels to progressively close over several months or years.<\/p>\n\n\n\nRisk classification and stratification<\/h3>\n\n\n\n
The multidisciplinary team of Arr\u00e1ez Institute for the management of AVMs<\/h2>\n\n\n\n
A Three-Pronged Approach<\/h3>\n\n\n\n
Commitment to Patient Safety<\/h3>\n\n\n\n