我孙子5岁,最近因外伤去医院做头部CT检查,发现颅内有个蛛网膜囊肿,但孩子平时并没有特别的不适症状。请问,这是一种什么疾病,需要手术治疗吗?北京胡××胡读者:蛛网膜囊肿是脑或脊髓实质外囊性占位性病变,不是肿瘤。体积大者可同时压迫脑组织及颅骨,可产生神经症状及颅骨改变。本病多见于儿童, My grandson, aged 5, recently went to the hospital for traumatic brain CT examination and found that intracranial arachnoid cysts, but the child usually does not have any special symptoms. Excuse me, is this a kind of disease, need surgical treatment? Beijing Hu ×× Hu readers: arachnoid cyst is brain or spinal parenchymal outer space occupying lesions, not a tumor. Large volume can simultaneously oppression of brain tissue and skull, can produce neurological symptoms and skull changes. The disease more common in children,