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What are arteriovenous malformations (AVMs)?

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An arteriovenous malformation, or AVM, is a type of brain lesion that occurs during early development. Arteries and veins in the brain grow in a tangle and become connected by tube-like structures called fistulae. These arteries are not as strong as normal arteries. The veins are often enlarged because of the constant flow of blood directly from the arteries through the fistulae to the veins. These fragile vessels may rupture, leaking blood into the brain. In addition, the brain tissue may not receive enough blood to function properly. Damage to the brain may cause seizures -- the first symptoms of an AVM.

From: Brain Lesions: Causes, Symptoms, Treatments WebMD Medical Reference

Reviewed by Neil Lava on September 16, 2018

Medically Reviewed on 09/16/2018

SOURCES:

Merriam-Webster Medical Dictionary: "Abscess;" "Infarct;" "Lesion;" and "Tumor."

WebMD Medical Reference: "Alzheimer's Disease: The Basics."

eMedicineHealth: "Multiple Sclerosis (MS) FAQs;" "The Central Nervous System and Multiple Sclerosis--Causes;" "Brain Abscess;" "Alzheimer Disease;" "Arteriovenous Malformations;" "Stroke, Ischemic;" "Cerebral Palsy;" and "Brain Metastasis."

WebMD Medical Reference from Healthwise. "Adult Brain Tumors Treatment (PDQ®) - Classification)."

Reviewed by Neil Lava on September 16, 2018

SOURCES:

Merriam-Webster Medical Dictionary: "Abscess;" "Infarct;" "Lesion;" and "Tumor."

WebMD Medical Reference: "Alzheimer's Disease: The Basics."

eMedicineHealth: "Multiple Sclerosis (MS) FAQs;" "The Central Nervous System and Multiple Sclerosis--Causes;" "Brain Abscess;" "Alzheimer Disease;" "Arteriovenous Malformations;" "Stroke, Ischemic;" "Cerebral Palsy;" and "Brain Metastasis."

WebMD Medical Reference from Healthwise. "Adult Brain Tumors Treatment (PDQ®) - Classification)."

Reviewed by Neil Lava on September 16, 2018

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What is cerebral infarction?

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