What is the vascular lesion believed to be the cause of these haemorrhages?
Charcot Bouchard microanueryms.
Non contrast CT of the brain demonstrates an acute intracerebral haemorrhage centred in the basal ganglia of the left hemisphere. These is extension into the ventricle (intraventricular haemorrhage), with blood forming a cast of the lateral ventricle, and passing into the third ventricle. There is no hydrocephalus at this stage.