“Paral sinus” is an anatomical concept, not a pathological concept. The so-called “para-sinus” refers to the meningioma located next to the “venous sinus”. So what is “venous sinus”? Simply put, it is a special, thick venous blood vessel, and part of the blood vessel wall is composed of the meninges. So it is not difficult to understand why meningiomas grow next to the sinuses. There is a kind of parasinusoidal meningiomas, which is called “difficulty in difficulty” and is called “spontaneous sinus meningioma”. The cavernous sinus is a special venous sinus. It contains not only venous blood, but also many important anatomical structures, such as some nerves responsible for eye movements, nerves responsible for head and face sensations, and the largest arteries in the brain. Therefore, cavernous sinus meningioma is a great challenge for neurosurgeons. Cervical sinus meningioma accounts for a small proportion of intracranial meningiomas. Surgical resection is extremely challenging because of its location in the cavernous sinus. Whether this area of the disease requires surgical intervention has been controversial. Part of the reason is that there is a lack of understanding of intracavernous sinus surgery and its feasibility. The cavernous sinus has always been considered a surgically restricted area, because the anatomical separation of the cavernous sinus often damages multiple cranial nerves, the carotid cavernous sinus segment and its branches, or the sympathetic plexus accompanying the artery. However, with the improvement of microneurosurgical techniques and understanding of cavernous sinus anatomy, the incidence of complications of surgical resection of this area has been significantly reduced. Of course, this is also the result of strict control of surgical indications for lesions in this area. Clinical manifestations Clinical symptoms of patients with cavernous sinus meningioma are caused by tumors compressing the neurovascular structures in cavernous sinus sinus. The typical clinical manifestation of the patient is headache, exophthalmos due to obstructed venous return, facial pain or numbness, and visual dysfunction such as diplopia, unequal pupils on both sides, ptosis, or blind spot in the visual field. In a few cases, due to the compression of the internal carotid artery, the patient will show symptoms of carotid artery stenosis. These symptoms include transient ischemic attacks (TIAs), transient dark shadows or cerebrovascular accidents (CVAs). Another uncommon clinical symptom is pituitary dysfunction caused by meningioma compression of the pituitary gland and the pituitary gland.