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cerebral arteriovenous malformation
A cerebral arteriovenous malformation (AVM) is an abnormal connection between the arteries and veins in the brain.
==Signs and symptoms==
The most frequently observed problems, related to an AVM, are headaches and seizures, backaches, neckaches and eventual nausea, as the coagulated blood makes its way down to be dissolved in the individual's spinal fluid. It is supposed that 15% of the population, at detection, have no symptoms at all.〔 Other common symptoms are a pulsing noise in the head, progressive weakness and numbness and vision changes as well as debilitating, excruciating pain.〔
In serious cases, the blood vessels rupture and there is bleeding within the brain (intracranial hemorrhage). Nevertheless in more than half of patients with AVM, hemorrhage is the first symptom.〔 Symptoms due to bleeding include loss of consciousness, sudden and severe headache, nausea, vomiting, incontinence, and blurred vision, amongst others.〔 Impairments caused by local brain tissue damage on the bleed site are also possible, including seizure, one-sided weakness (hemiparesis), a loss of touch sensation on one side of the body and deficits in language processing (aphasia).〔 Minor bleeding can occur with no noticeable symptoms. Following the bleed's cessation, most AVM victims return to normal, after the blood vessel has had time to repair itself.
AVMs in certain critical locations may stop the circulation of the cerebrospinal fluid, causing accumulation of the fluid within the skull and giving rise to a clinical condition called hydrocephalus. A stiff neck can occur as the result of increased pressure within the skull and irritation of the meninges.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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