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Can you nominate some pathological causes for subarachnoid FLAIR hyperintensity?
- subarachnoid haemorrhage - meningitis - leptomeningeal carcinomatosis - acute stroke (intravascular, due to slow flow) - moya moya disease - leptomeningeal melanosis - fat containing lesions in subarachnoid space (lipoma, ruptured dermoid cyst)
There are some subarachnoid FLAIR hyperintensities randomly distributed.