Recurrent Subarachnoid Haemorrhage from Paraventricular Lesions with Normal Angiography.

Vascular anomalies, either aneurysmal or arteriovenous, figure predominantly as the causative lesions in spontaneous subarachnoid haemorrhage. Such haemorrhage as the presenting feature of intracranial tumour, although much rarer, is sufficiently well recognized not to cause diagnostic difficulties; _ ,J ablost invariably some evidence of a space-occupying lesion, if not of a pathological circulation, is seen on subsequent angiography, especialy in cases of supratentorial neoplasm. Ernsting (1955) reported a patient with recurrent subarachnoid bleeding, in whom, after carotid angiograms a year previously had been regarded as normal, a choroid plexus papila loma was demonstrated when the investigation was repeated. The lesion was confirmed by air studies and successfully removed. Ernsting pointed out the possibility of a small papilloma bleeding into the ventricle and yet not being apparent on arteriograms. The purpose of this paper is to present three cases with recurrent haemorrhage from paraventricular FIG. 1 Case: Normaleantero-posteriorarter lesions not revealed on angiography. compression ofthe kft carotid artery in the ned