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

malformation

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

arteriovenous malformation

Abbreviation: AVM
Angiodysplasia.

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.

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.

Arteriovenous malformation

An abnormal tangle of arteries and veins in which the arteries feed directly into the veins without a normal intervening capillary bed.
References in periodicals archive ?
A New Therapeutic Approach to Congenital Pelvic Arteriovenous Malformations.
The role of echocardiography in screening for pulmonary arteriovenous malformations.
In this review we cover the classification and endovascular management of arteriovenous malformations (AVMs).
Arteriovenous malformations are vascular malformations of the brain with arteriovenous shunting and no intervening capillary bed.
Uterine arteriovenous malformations are a rare cause of abnormal vaginal bleeding, most commonly seen in women who have been pregnant and experienced some type of uterine trauma such as D and C.
Multisession CyberKnife radiosurgery for intramedullary spinal cord arteriovenous malformations.
6 Differential diagnoses of intraparenchymal-calcified lesions include metabolic disorders (hyperparathyroidism, lead poisoning), infectious disorders (cytomegalovirus infection, toxoplasmosis, tuberculomas), neoplasms (ependymoma, oligodendroglioma), and vascular malformation, including Sturge-Weber syndrome and pial arteriovenous malformation.
The arteriovenous malformations (AVMs) are vascular lesions characterized by direct connections between feeding arteries and draining veins without an intervening capillary network [15].
Occipital arteriovenous malformation and visual field defect.
Complications of cerebral arteriovenous malformation embolization: multivariate analysis of predictive factors.
Linda MacMillan, chairwoman of ECC, said:"Elderslie Community Council is proud to present a cheque for PS300 that was raised from the Christmas fayre to Glasgow Children's Hospital Charity in the name of Another Star InThe Sky, the tribute fund that was set up by Sameena Javed in memory of her son Ahmar a local boy who sadly passed away from a rare condition called Arteriovenous Malformation.
Background: Cerebral arteriovenous malformation (cAVM) is a type of vascular malformation associated with vascular remodeling, hemodynamic imbalance, and inflammation.