arteriovenous malformation

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arteriovenous malformation

Neurology A potentially fatal congenital intracranial anomaly with large arteries feeding in a mass of communicating vessels which empty into large draining veins filled with 'arterialized' blood; large AVMs produce a shunt large enough to ↑ cardiac output Location Brain, medulla, spinal cord Clinical Headaches, seizures, subarachnoid hemorrhage Imaging CT, MRI, endovascular angiography ASAP
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.


(mal?for-ma'shon) [ mal- + formation]
Abnormal shape or structure, esp. congenital; deformity.

arteriovenous malformation

Abbreviation: AVM

cavernous malformation (of the brain)

A collection of tiny blood vessels surrounded by neural tissue, found in the brain on MR scans, but not easily seen with cerebral angiography. If these blood vessels rupture, they may cause headaches or seizures.

spinal cavernous malformation

A cavernous malformation in the spinal cord. If the abnormal veins in the malformation rupture, a patient may suffer stroke-like symptoms that correspond to the nerves at the level of the spinal cord where the hemorrhage occurs.

tooth malformation

Abnormalities of size and shape that usually occur during the morphodifferentiation stage of tooth formation. Incomplete matrix formation or mineralization will also result in defective teeth that may or may not be abnormal in shape initially.
Medical Dictionary, © 2009 Farlex and Partners

arteriovenous malformation

An abnormal, congenital network or clump of blood vessels linking an artery and a vein. These may occur anywhere in the body but are especially dangerous within the skull. The commonest presentation is a SUBARACHNOID HAEMORRHAGE. Blood flow though an arteriovenous malformation is often rapid and may be audible through the skull with a stethoscope.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005

Arteriovenous malformation

An abnormal tangle of arteries and veins in which the arteries feed directly into the veins without a normal intervening capillary bed.
Gale Encyclopedia of Medicine. Copyright 2008 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
''Steal'' is an unestablished mechanism for the clinical presentation of cerebral arteriovenous malformations. Stroke.
Predictive factors for response of peripheral arteriovenous malformations to embolization therapy: Analysis of clinical data and imaging findings.
Head and neck arteriovenous malformations: Results of ethanol sclerotherapy.
Leandro et al., "Contrast echocardiography for pulmonary arteriovenous malformations screening: does any bubble matter?" European Journal of Echocardiography, vol.
Matsubara, "Transarterial embolization and ablation of renal arteriovenous malformations: efficacy and damages in 30 patients with long-term followup," Journal of Urology, vol.
Tradi et al., "Transcatheter arterial embolization with ethylene vinyl alcohol copolymer (Onyx) for the treatment of hemorrhage due to uterine arteriovenous malformations," Diagnostic and Interventional Imaging, vol.
Arteriovenous malformations (AVMs) are a rare source of potentially life-threatening uterine bleeding, and should be suspected in patients presenting with metromenorrhagia.
When an arteriovenous malformation (AVM) occurs, a tangle of blood vessels in the brain, or on its surface, bypasses normal brain tissue and directly diverts blood from the arteries to the veins.
Klippel-Trenaunay syndrome with intracranial arteriovenous malformation: a rare presentation.
He was diagnosed in January with an Arteriovenous Malformation (AVM), a tangle of blood vessels in the brain which puts suerers at high risk of stroke.