arteriovenous malformation

Also found in: Dictionary, Thesaurus, Legal, Acronyms, Encyclopedia, Wikipedia.

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


(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.

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 ?
The radical treatment for pancreatic arteriovenous malformation is complete or partial resection of pancreas.
Can induction of systemic hypotension help prevent nidus rupture complicating arteriovenous malformation embolization?
Pulmonary arteriovenous malformations in patients with hereditary hemorrhagic telangiectasia.
Large Pelvic Arteriovenous Malformation Complicating Laparoscopic Radical Prostatectomy.
Their risk factors for the prior stroke included thrombophilias, sickle cell disease, cardiac malformations, hypertension, oral contraceptive use, cerebral arteriovenous malformations, head trauma, meningitis, endocarditis, and idiopathic etiologies.
Deep arteriovenous malformations of the basal ganglia and thalamus: Natural history.
Arteriovenous malformations (AVMs) are a snarled tangle of arteries and veins that disrupt the circulatory system, generally believed to arise whilst in the womb or soon after birth.
Grenache, 2, suffers from an arteriovenous malformation, according to his family.
Use contrast-enhanced CT to identify arteriovenous malformation, subarachnoid hemorrhage, meningitis, hydrocephalus, neoplasm, pituitary apoplexy, stroke, or subdural hematoma.
We report the case of a 20-year-old man with possible Osler-Rendu-Weber syndrome (hereditary haemorrhagic telangiectasia) who developed an episode of massive haemoptysis from a bleeding pulmonary arteriovenous malformation in the left lower lobe of his lung.
The findings at ultrasound were explained in 19 (33%) of the 57 patients by an alternative diagnosis of multiple small myometrial fibroids in 18 patients and a uterine arteriovenous malformation in 1 patient.
Three years ago, mother-of-two Janet Harrington was diagnosed with a rare condition, arteriovenous malformation (AVM), which affects only one in every 10,000 people.