They are radioopaque due to sulfur content, though more difficult to visualize than calcium oxalate stones.
2.
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.
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