The aqueduct of Sylvius is the narrow passageway between the

The aqueduct of Sylvius is the narrow passageway between the third and fourth ventricles. What happens to CSF flow if the aqueduct becomes blocked by infection or tumor, a condition known as aqueductal stenosis? On a 3-D imaging study of the brain, how would you distingush aquecuctal stenosis from a blockage of CSF flow in the subarachonid space near the frontal lobe?

Solution

Ans:

This blockage can causes ventricle volume to increase, which results in higher pressure within the ventricles and cause higher pressure in the cortes from its being pushed into the skull.

MR velocity mapping should be performed. In hydrocephalus patients, velocity vector an dparticle path lines should be calculated for visualization of flow dynamics. If the CSF is hypomotile it shows attenuated dynamics and if it is hypermotile flow then it showa increased dynamics compared to volunteers.

The patient who is suffering from Aqueductal stenosis should have non-communicating hydrocephalus ex vacuo due to brain atrophy.