According to their pathological characteristics, they are divided into the following types: endothelial or fibrous, vascular, granular, mixed or migratory, malignant meningioma, meningiosarcoma, and meningeal sarcoma. Generally speaking, the first five types are classified as benign meningiomas, and vascular meningiomas are the most frequent malignant tumors, and those with multiple recurrences should be considered to have malignant possibilities. The growth characteristics of malignant meningioma: the cell morphology has the characteristics of malignant tumor, the growth is fast to the surrounding tissues, and metastasis occurs. 1, Ectopic meningioma: there are still ectopic meningiomas, occasionally seen in the cranial plate barrier, frontal sinus, nasal cavity under the scalp or neck, which come from ectopic arachnoid tissue, not metastasis, meningiomas are multiple, accounting for about 1% to 2%, and can be up to dozens of, scattered in the same place, in which a large tumor nodule, and small tumors, as big as walnut, as small as a grain of corn, the episclerial meningioma is far more than the infrasclerial meningioma. In addition, meningioma can exist with glioma and neurofibroma in the cranium at the same time, and can also coexist with hemangioma. 2. Meningeal sarcoma: mostly seen in children under 10 years old, with rapid development, infiltrative growth, irregular shape and unclear boundary, rapid development after operation, and distant metastasis. According to different parts of the brain, the special clinical manifestations of meningiomas are also different, which are summarized as follows: meningioma of the convex surface of the brain, the history of the disease is generally longer, the main manifestations of different degrees of headache, mental disorders, limb movement disorders and vision and visual field changes, about 60% of the patients can appear symptoms of elevated cranial pressure after half a year, and some of the patients can have partial epilepsy, face and hand convulsions, grand mal seizures are not common. 3.Parasagittal sinus meningioma: the tumor grows slowly, usually when the patients have symptoms, the tumor has been very big, epilepsy is the first symptom of this disease, partial or grand mal seizure, mental disorder manifested as dementia, emotional indifference or euphoria, and the patients have personality changes, and visual field disorders can be seen in parasagittal sinus meningioma located in occipital lobe. 4, Pterygoid crest meningioma: if the tumor originates from the anterior bed protrusion, vision loss or even blindness may occur; if it invades to the orbit or supraorbital, eyeball protrusion, eyeball movement disorder, pupil dilatation; epilepsy, psychiatric symptoms, olfactory sense disorder, etc.. 5, Saddle node meningioma: visual field disorder, more than 80% of patients with visual impairment as the first symptom; headache, a small number of patients may have drowsiness, memory loss, anxiety and other psychiatric symptoms; some patients may have endocrine dysfunction, such as decreased libido, impotence, amenorrhea, etc.; there are also some patients with loss of olfactory sensation, epilepsy, and kinetic nerve paralysis as the first symptom to the clinic. 6, olfactory groove meningioma: early symptoms of gradual loss of sense of smell, increased intracranial pressure can cause visual impairment, when the tumor affects the function of frontal lobe, there can be excitement, hallucination, delusion, retardation, mental apathy, and a small number of patients can have epilepsy. It often causes ipsilateral optic nerve atrophy, and due to increased intracranial pressure, the contralateral optic nerve edema becomes Foster-kenydy sign. 7.Bridge cerebellar angle meningioma: this part of the tumor is more common with acoustic neuroma, accounting for 70-80% of meningioma, only 6-8%, cholesteatoma 4-5%, with clinical manifestations such as hearing loss, tinnitus, facial numbness, hyperalgesia and so on. The damage manifests as unsteady walking, coarse horizontal tremor, and ataxia on the affected side. 8.Rock bone-slope meningioma: often manifested as headache, but often not attracted attention, Ⅲ-X cranial nerve damage symptoms are obvious. Intracerebroventricular meningioma: Due to the growth in the intracerebroventricular cavity, the early neurological function damage is not obvious, and the tumor is mostly larger when the patient consults the doctor. It often manifests as headache, optic papillae edema, epilepsy, isotropic hemianopsia, and hemiparesis of contralateral side of the limbs. 10.Middle cranial fossa meningioma: manifested as trigeminal neuralgia, ocular motility disorder, eyelid ptosis, diplopia, decreased visual acuity, synoptic hemianopsia, and so on. 11.Meningioma of cerebellar tegmentum: coarse horizontal tremor and ataxia on the affected side, visual field disorder. 12.Paraventricular meningioma of cavernous sinus: manifested as headache, visual field change, ophthalmoplegia, pain in the distribution area of one or two branches of trigeminal nerve. 13.Meningioma of occipital foramen magnum: early manifestation of neck pain, numbness of hands and upper limbs, easy to be misdiagnosed. 14.Orbital and cranio-orbital communication meningioma: eyeball protrusion, eyeball movement disorder, vision loss.