A 46 year-old man presented with a sudden, severe headache, nausea and vomiting.

Axial CT scan - note the intraventricular hemorrhage with the layering of blood in the occipital horns. Most often, intraventricular hemorrhage occurs in the setting of subarachnoid hemorrhage and diffusion of blood into the ventricles. In other cases, it occurs as a primary phenomenon, presumably from a bleeding source near the ventricular lining.

Revised 05/01/06.
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