RESUMO
The authors attempted to make experimental intraventricular hemorrhage by injection of autogenous whole blood into the lateral ventricle through a small burr hole and to observe the outcome of the intraventricular hematoma and the consequent change of the ventricular system in the rabbits. 1) The maximum duration of remaining hematoma was 4 days in the ventricular system and 28 days in the subarachnoid space. 2) In the ventricular hemorrhage group, the ventricular began to dilate after 1 day of hemorrhage. 3) The degree of the ventricular dilatation related to the amount of the injected blood into the lateral ventricle. 4) In the microscopic findings of the ventricular dilatation, flattening of the periventricular white matter fiber were more prominent in acute phase and subsided thereafter. Hemosiderin or siderophage observed before 1 week at the ventricular wall and after 1 week at the leptomeninges. The meningeal fibrosis or thickening was almost constantly presented throughout the 4 weeks. 5) The gross and microscopic changes were milder in the steroid therapy group than the others.