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Abstract
The endovascular therapy or interventional
neuroradiology plays an important place in modern
neurosurgery. In selected cases, it may lead to a total and
permanent cure per se, but in most cases, it will be an
adjunctive therapy to microsurgery or radiosurgery. With
the development of superselective angiography, and
embolic materials, it has become a rapidly growing subspeciality
of its own.
Brain arteriovenous malformation (AVMs) are congenital
and perhaps, in some cases, acquired vascular lesions that
can occur anywhere in the central nervous system and
consist primarily of three distinct components: (1) arterial
feeders (AFs), (2) a conglomerate of enlarged abnormal
vessels, (nidus), and (3) draining veins (DVs). The
abnormal low-resistance, high-flow shunting of blood
within the AVM without an intervening capillary bed
causes additional structural fatigue, further enlargement,
and possible rupture. Hemorrhage is the most serious
sequela of AVMs, accounting for 50% of their clinical
presentation, a 10% to 17% death rate, and a severe
disability rate of 20% to 29%.