Here are five points on the life-threatening disease:
According to Johns Hopkins Medicine Centre, it is a ballooning arising from an abnormal focal dilation of an artery in the brain that results from a weakening of the inner muscular layer in the wall of a blood vessel in the brain.
The disease is also called brain aneurysm or intracranial aneurysm. The "blister-like" dilation can become thin and rupture without warning.
It is life-threatening because if brain aneurysm expands and the blood vessel wall becomes too thin, it will rupture and bleed into the space around the brain, as per Johns Hopkins Medicine Centre. This event is called a subarachnoid hemorrhage and may cause a hemorrhagic stroke.
Most brain aneurysms have no symptoms and are small in size (less than 10 millimetres). However, some occasional symptoms include headaches (rare, if unruptured), eye pain, vision changes and diminished eye movement.
In May, news reports claimed that Chinese President Xi Jinping is suffering from 'cerebral aneurysm' and had to be hospitalised at the end of 2021. Ms Clarke had suffered two brain aneurysms in the early years of filming the hit series Game of Thrones. During the recovery after the first surgery at the age of 24, she couldn't even recall her own name.
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