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Log in sign up about these ads encyclopedia (browse by topic or system) add article patient cases (browse by topic or system) add case quiz mode (diagnose from case presentations) this site is targeted at medical and radiology professionals, contains user contributed content, and material that may be confusing to a lay audience. Use of this site implies acceptance of our terms of use. Edit article developmental venous anomaly dr yuranga weerakkody and dr donna d'souza et al. View revision history a developmental venous anomaly (dva) also known as cerebral venous angioma, is a congenital malformation of veins which drain normal brain. They were thought to be rare pre cross sectional imaging, however are now recognised as being the most common cerebral vascular malformation, accounting for 50 - 63% of all such lesions 1. It is characterised by a caput medusa sign of veins draining into a single larger collecting vein, which in turn drains into either a dural sinus or into a deep ependymal vein. The appearance has also been likened to a palm tree. Pathology the aetiology of dvas remains uncertain, but may relate to arrested development of venous structures 2-3. Histologically they consist of a number of abnormally thickened veins with normal feeding arteries and capillaries 3. Location and classification the most common locations are frontoparietal region (36 - 64%) 1, usually draining towards the frontal horn of the lateral ventricle (see case 1) cerebellar hemisphere (14 - 27%) draining towards the fourth ventricle (see cases 2-3) dvas however can be seen anywhere, draining both superficially or deep. Associations lesions are usually solitary (75%) 2, except in blue rubber bleb naevus syndrome. There is also an association for venous malformations of the head and neck 2. In 8 - 33% of cases 2 they are associated with cavernous malformations and are referred to as mixed vascular malformations. Radiographic features dvas are seen on both ct and mri as a leash of vessels draining towards a central vein. Ct if large then the draining vein may be seen on non-contrast ct, and is confirmed with contrast administration. Mri may be visible on most sequences, but is most easily seen on post contrast t1 sequences. generic viagra usa pharmacy cheap viagra uk delivery buy viagra online buy cheap viagra cheap generic viagra buy viagra cheap viagra online canadian pharmacy generic viagra cheap viagra cheap viagra online If there is an associated cavernous haemangioma then susceptibility weighted sequences will be most sensitive for this component. â  dsa - angi. To change this page, upload your website into the public_html directory
Date Created: Tue Mar 22 14:56:48 2011