“…In general, tumours compress unilateral arteries, but 5 cases of bilateral ICA compression [7, 9, 19, 26, 29] and 3 cases of bilateral ACA compression have been reported in the literature [18, 28, 39]. Cerebral vasospasm is another mechanism of cerebral infarction caused by PA [2, 7, 8, 11-13, 15, 17, 18, 21, 22, 27, 28, 31, 32, 40]. First, pituitary tumour haemorrhage enters the subarachnoid space.…”