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Arteriovenous Malformation (AVM)


What is arteriovenous malformation?

Arteriovenous malformation (AVM) is an abnormal connection between arteries and veins, bypassing the capillary system. AVMs are usually congenital. Symptoms of AVM vary according to the location of the malformation. Most of the people with an AVM are asymptomatic. The most general symptoms of a cerebral AVM include headaches and epileptic seizures.


Patients may have localized pain in the head due to increased blood flow around an AVM. Many patients with an AVM have an intracranial hemorrhage.
Few patients may have difficulty with movement, speech and vision.


A brain AVM contains abnormal communications between arteries and veins which are weak. These abnormal and weak blood vessels dilate over time forming intranidal anurysms. These may burst from the high pressure of blood flow causing bleeding into the brain.


  • CT angiography.
  • MR angiography.
  • Conventional MR angiography.


Endovascular Embolisation: A small tube (microcatheter) is placed in the nidus of the malformation which is the embolised using liquid embolic agents like glue, Onyx, Squid etc.