Neuropathological lesions in posttraumatic internal hydrocephalus

: The authors described the lesions associated with post-traumatic internal hydrocephalus in 4 cases who died after a prolonged post-traumatic coma. The internal hydrocephalus, quite severe in all cases, and the demyelination in the periventricular white matter in 3 cases, are thought to be produced by a chronic increase in the intraventricular pressure, probably secondary to malfunction of circulation and resorption of the cerebro-spinal fluid.