Cerebral venous sinus thrombosis MRI
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Cerebral venous sinus thrombosis Microchapters |
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Differentiating Cerebral venous sinus thrombosis from other Diseases |
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Diagnosis |
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Treatment |
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Case Studies |
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Cerebral venous sinus thrombosis MRI On the Web |
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American Roentgen Ray Society Images of Cerebral venous sinus thrombosis MRI |
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Directions to Hospitals Treating Cerebral venous sinus thrombosis |
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Risk calculators and risk factors for Cerebral venous sinus thrombosis MRI |
Computed tomography, with radiocontrast in the venous phase (CT venography or CTV), has a detection rate that in some regards exceeds that of MRI. The test involves injection into a vein (usually in the arm) of a radioopaque substance, and time is allowed for the bloodstream to carry it to the cerebral veins - at which point the scan is performed. It has a sensitivity of 75-100% (it detects 75-100% of all clots present), and a specificity of 81-100% (it would be incorrectly positive in 0-19%). In the first two weeks, the "empty delta sign" may be observed (in later stages, this sign may disappear).[1]
Magnetic resonance venography employs the same principles, but uses MRI as a scanning modality. MRI has the advantage of being better at detecting damage to the brain itself as a result of the increased pressure on the obstructed veins, but it is not readily available in many hospitals and the interpretation may be difficult.[1]