The intermediate sail cavity itself does not affect the IQ condition, the corresponding cavity is caused by the widening of the subarachnoid space, which has no effect on the development of the nervous system and will not affect the intellectual development, and most of the corresponding cavities do not cause clinical symptoms; in some people, arachnoid cysts will produce a space-occupying effect and cause compression symptoms. 1. Physiologic intermediate sail cavity itself is only caused by simple expansion, the corresponding condition will not cause cerebrospinal fluid circulation abnormality, and does not affect the physical condition. 2. The presence of arachnoid cysts in the middle sail cavity may cause compression of the adjacent tissues, partially affecting the circulation of cerebrospinal fluid and further leading to headache and dizziness, without affecting the mental ability. On the whole, the middle sail cavity does not affect the intelligence quotient, after the emergence of the corresponding conditions, need to be combined with the clinical examination, resulting in serious symptoms of obstruction, only need to carry out clinical treatment, do not be negligent, so as not to delay the condition.