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Intraventricular hemorrhage (IVH) in adults usually occurs in the setting of aneurysmal subarachnoid hemorrhage or hypertension-related intracerebral hemorrhage. Thus, the underlying cause of IVH is apparent from history and radiographic findings. If the underlying cause of IVH is not apparent, additional studies, including cerebral angiography, magnetic resonance imaging, and toxicology screening, should be performed to identify etiologic agents that may alter management of IVH. ⋯ Intraventricular injections of thrombolytic agents through an IVC is a treatment option that may be considered in all patients with IVH that is causing or threatening to cause obstructive hydrocephalus. Unrepaired cerebral aneurysms, untreated cerebral arteriovenous malformations, and clotting disorders are contraindications for this intervention. The surgical evacuation of IVH has a role only in very rare cases in which the IVH is causing a significant mass effect independent of hydrocephalus and associated intraparenchymal brain hemorrhage.