Developmental Venous Anomalies (Venous Angiomas) on MRI Are More Common in Patients with Multiple Sclerosis, via Alison Fisher

http://cds.ismrm.org/ismrm-2004/Files/001503.pdf
'The exact pathogenesis of DVA is unknown, with the 2 most popular theories being: (1) a primary dysplasia of capillaries and small transcerebral veins (2) a compensatory mechanism of an intrauterine accident resulting in thrombosis of normal venous pathways. Although the reason for the higher prevalence of DVA in MS patients is unknown, it is intriguing that there have been several case reports of cerebral venous thrombosis (2) occurring in patients with MS. Also of possible interest is the suggestion that a hypoxia-like metabolic injury may be a pathogenetic component of a subset of inflammatory MS brain lesions.'