Abstract

A developmental venous anomaly (DVA, formerly known as venous angioma) is a congenital variant of the cerebral venous drainage. On imaging it is seen as a number of small deep parenchymal veins converging toward a larger collecting vein.

Characteristics

DVA can be characterized by the Caput medusae sign of veins, which drains into a larger vein. The drains will either drain into a Dural venous sinuses or into a deep ependymal vein. It appears to look like a Palm tree.

Diagnosis

DVA can be diagnosed through the Cerebral venous sinus thrombosis with collateral drainage. DVA can also be found diagnosed with Sturge–Weber syndrome and can be found through leptomeningeal angiomatosis. Demyelinating disease has also been found to enlarge Medulla veins.