Ruptured MCA aneurysm
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Subarachnoid haemorrhage due to ruptured MCA aneurysm. Note that the hypodense spot in the non-contrast CT corresponds with the MCA aneurysm in the contrast-enhanced CT.
Berry aneurysms form 97% of aneurysms of the central nervous system. Up to 80% of patients with a spontaneous subarachnoid haemorrhage have ruptured an aneurysm. 90% of these aneurysms are located in the anterior circulation (carotid) and 10% are found in the posterior circulation (vertebrobasilar).