More than 200 intraventricular haematomas (IVH) have been treated in the Homburg Neurosurgical University Clinic since computed tomography was available and facilitated the diagnosis. Among 200 consecutive cases, which are analysed and presented in this publication, there were 71 patients with subarachnoid haemorrhage (SAH)--58 of whom with angiographically and/or pathologically verified aneurysms--, and 21 cases with intraventricular angiomas. IVH without concomitant intracerebral haematoma (ICH) and without evidence of SAH is highly suggestive of intraventricular angioma. In our experience panangiography [if available digital subtraction angiography (DAS)] should be done as soon as possible in all cases of IVH. It is a precondition for early diagnosis and operative elimination of the source of bleeding, because the retrospective analysis of our material shows that rebleeding is by far the highest single risk factor in cases with IVH caused by aneurysms or angiomas. We therefore recommend early microsurgical occlusion of the aneurysms and exstirpation or intravascular embolisation of the angioma. The best survival rate (76%) was achieved in IVH cases caused by angiomas. In aneurysms with IVH the survival rate was 35%, in IVH caused by other diseases 37%. The worst prognosis occurs in SAH with IVH without proven aneurysm or angioma. The survival rate of this group was only 8%.