The saddle septum is the dura between the pituitary gland and the brain tissue, through which the pituitary stalk passes. Although small, the saddle septum is a good site for meningioma because it is a dural fold. Although the septum is small, it is a folding of dura mater and therefore a good site for meningioma. Meningioma in the septum mainly develops upward, and the optic nerve is easily damaged by pressure. If the patient can be seen in time, the vision can be restored through surgery. However, if the tumor is found late and the pressure on the optic nerve is too long, the blood supply of the nerve will be mixed with the tumor, so the surgery will probably lead to blindness. Since saddle septal meningioma is between the optic nerve, internal carotid artery and pituitary stalk, there is a possibility of tumor dead space, and the tumor may not be removed completely and the tumor will come back after a few years. There are also pituitary stalk reactions after septal meningioma surgery, and pituitary dysfunction such as electrolyte disturbance and urinary collapse may occur.