Sudden loss of consciousness
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CT shows a large hyperdense lesion in the left temporal lobe with signs of subarachnoid haemorrahage. Significant mass effect and midline shift. Posterior fossa unaltered
This case shows a large intracranial hemorrhage. The patient died few hours later.
Although no aneurysm is visible on this non-contrast study, a left middle cerebral artery aneurysm is the most likely cause of this pattern of haemorrhage. The aneurysm dome can be adherent to brain (perhaps due to prior 'leaks') and when it rupturs some blood squirts directly into parenchyma.
Other causes are of course possible (lobar haemorrhage, tumour, other vascular malformation).