| http://www.w3.org/ns/prov#value | - Often, a precipitating factor, such as head injury or obstetrical delivery, causes sinus thrombosis in a person with a genetically increased risk.1 In a recently published multicenter study3, 44% patients with CVT had one risk factor, 33% had two, and 6% had 3 or more risk factors for CVT. In only 17% patients, no risk factor could be identified.We will review some of the rather unusual and rare r
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