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What is the vascular lesion believed to be the cause of these haemorrhages?
Charcot Bouchard microanueryms.
What is the most common underlying cause of these types of haemorrhage?
Chronic poorly controlled hypertension.
Non-contrast CT of the brain demonstrates an acute intracerebral haemorrhage centred in the basal ganglia of the left hemisphere. There is extension into the left lateral 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.