A fluid-filled canal that runs through the midbrain connecting the third and fourth ventricles.
- This ventricle is continued cranially into the cerebral aqueduct of the midbrain.
- The fourth ventricle communicates with the third ventricle via a narrow tube, the cerebral aqueduct, which runs up through the midbrain.
- Transependymal flow (best appreciated on the proton density images) is also seen and consistent with obstruction of the cerebral aqueduct from compression of the midbrain by uncal herniation.
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