arteriovenous malformation

(redirected from Arterio-venous malformation)

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 ?
Imaging modalities for retrieval of a migrated coil from the left ventricle, after pulmonary arterio-venous malformation embolization.
Less frequent causes of exclusion included arterial aneurysms (n = 2), fibromuscular dysplasia (n = 1), atherosclerotic plaque at renal arterial ostium (n = 1), multiple renal artery aneurysms suggesting polyarteritis nodosa (n = 1), arterio-venous malformation (n = 1), and duplicated inferior vena cava (n = 1).
Surgical management of scalp arterio-venous malformation and scalp venous malformation: An experience of eleven cases.
Both PMA were carefully examined to exclude additional extra morphologies such as calcification, arterio-venous malformation, vessel aneurysms or any other abnormal nonvascular variants including any accessory muscle belly accompanying the MN in the tunnel.
We excluded sub-arachnoid hemorrhage, arterio-venous malformation, and venous stroke.
Aneurysm of vein of galen is a dilatation either due to pressure overload or associated arterio-venous malformation. First case of vein of galen aneurysm was described by jagger et al.
Causes of intracranial haemorrhage Intracerebral haematoma Subarachnoid haemorrhage Hypertensive haemorrhage Aneurysm Amyloid angiopathy Peri-mesencephalic bleed Arterio-venous malformation Arterio-venous malformation Aneurysmal haemorrhage Pituitary apoplexy Haemorrhagic tumour Drug abuse Dural sinus fistula Anticoagulant drugs Infarct with haemorrhagic Pituitary apoplexy transformation Venous infarct with Anticoagulant drugs haemorrhagic transformation Pathophysiology
3) confirmed a left temporal lobe arterio-venous malformation with secondary intracerebral bleeding as well as a well-defined, enlarged venous pouch in keeping with a vein of Galen malformation.
The condition, arterio-venous malformation or AVM, was diagnosed in March last year and she was being treated at the Walton centre where the surgery was suggested two weeks ago.
Major findings that led to the diagnosis of KTW syndrome Cutaneous hemangioma--port wine stain Long-standing varicose veins Soft tissue and bony hypertrophy of the extremities Arterio-venous malformation
CONCLUSION: A 22-year old female patient presented with parieto-occipital scalp swelling which was suspected to be a case of arterio-venous malformation by color Doppler and pulsed Doppler examination and later confirmed by CT angiography.
Diagnosis: Acquired uterine Arterio-venous malformation is a rare but potentially life threatening condition and as such must be considered in the differential diagnosis of cases of abruption, profuse vaginal bleeding following uterine curettage.