Cerebral venous thrombosis
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 Discussion of Cerebral venous thrombosis
- Cerebral venous thrombosis is a relatively uncommon disorder (estimated annual incidence of between two and seven cases per million) in the general population.
- Causal factors may be classified as:
- Local: Related to intrinsic or mechanical conditions of the cerebral veins and dural sinuses (i.e. sinus trauma, mastoiditis, and neoplastic invasion or compression).
- Systemic: Related to clinical conditions that promote thrombosis (i.e. protein S and protein C deficiencies, a peripartum state, oral contraceptive use, and hypercoagulable states secondary to malignancy).
- The clinical manifestations of cerebral venous thrombosis vary, depending on the extent, location, and acuity of the venous thrombotic process as well as the adequacy of venous collateral circulation.
- Intracranial hypertension occurs in 20%–40% of patients with cerebral venous thrombosis and should be excluded in patients with the specific complex of symptoms.
 Imaging Findings for Cerebral venous thrombosis
- The classic finding of sinus thrombosis on unenhanced CT images is a hyperattenuating thrombus in the occluded sinus; however, hyperattenuation is present in only 25% of sinus thrombosis cases.
- Increased attenuation in the venous sinuses also may be seen in patients with dehydration, an elevated hematocrit level, or a subjacent subarachnoid hemorrhage or subdural hematoma.
Patient #1: Thrombosis of multiple sinuses
 See Also
 External Links
 References for Cerebral venous thrombosis
- James L. Leach, Robert B. Fortuna, Blaise V. Jones, and Mary F. Gaskill-Shipley. Imaging of Cerebral Venous Thrombosis: Current Techniques, Spectrum of Findings, and Diagnostic Pitfalls. RadioGraphics 2006 26: S19-41S.