n.动脉瘤
Congenital aneurism is disease of blood-vessel of a kind of head, often bring about arachnoid haemorrhage finishing speech, be not the tumour inside true skull. 先天性动脉瘤是一种脑血管病，常导致蛛网膜下腔出血，并非真正的颅内肿瘤。
