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✓ Intracranial venous pressure was increased by blocking the torcular Herophili in 10 dogs. At intervals of 1 to 29 weeks, pressure in the superior sagittal sinus and cerebrospinal fluid (CSF) were recorded and the size of the ventricles determined at autopsy. Changes in venous pathways were documented by sinograms. Significant increase in both sagittal sinus and CSF pressures occurred after torcular block. CSF pressures remained elevated for as long as 29 weeks at an average of 100 mm above preblock levels. Neurological deficits after torcular block were minimal. Autopsies showed normal-sized ventricles without any stigmata of hydrocephalus.

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