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Almost pure primary intraventricular hemorrhage was seen on initial non-contrast scan. There is only a small amount of blood in cerebellopontine cistern. There was no blood elsewhere.
On CTA, the cause was identified - a small, 3.5 mm wide, left PICA aneurysm or maybe pseudoaneurysm (patient unfortunatelly expired prior to DSA) in its supratonsillar segment, which manifested itself as a pure intraventricular hemorrhage.