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A 64-year old lady presented with a Fisher grade II subarachnoid haemorrhage (SAH). CT-angiography and conventional angiography showed a giant .\r<br>\r<br>\r<br>\r<br>Left Trans-sylvian approach to left carotid-ophthalmic aneurysm. The aneurysm was causing mass effect on the optic nerve and causing visual loss. Clipping .