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Intracranial Stenosis

This condition relates to a focal narrowing of the artery, either as a result of an atherosclerotic lesion or as a result of external compression due to a tumor.

TCD will easily identify a local increase in blood flow velocities, characterized by the fact the at a greater or smaller depth the velocities will be much lower.

Peak focal velocities above 150 cm/sec reflect arterial stenosis. However, if the severity of the stenosis is beyond its' critical level, velocity signals may be diminished.

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