Acoustic neuroma

Acoustic neuroma refers to a tumor that originates from the auditory nerve sheath. It mostly originates from the inner auditory canal of the phrenic nerve. It can also originate at the beginning of the inner sheath of the inner ear canal or at the bottom of the inner ear canal. It comes from the superior vestibular nerve, followed by the inferior vestibular nerve, usually unilateral, with fewer occurrences on both sides. The appearance of the tumor is gray-red, different in size, different in shape, and the presence of fatty and cystic changes in the background. The difference between the degree and the hardness is different. The tumor surface has a membrane. Under the microscope, the tumor cells are mostly spindle-shaped, long rod-shaped, arranged in a fence or vortex, the cytoplasm is longitudinally fibrous, and contains a rough endoplasmic reticulum. In the case of cells, there are many long protrusions on the edge of the tumor cells, staggered in the interstitial space, and coexist with collagen fibers and Rose bodies. Some tumor cells are polymorphic, forming clusters, unclear boundaries, and forming clusters of different sizes and shapes. There are mucus-containing microvoids between cells. Two types of cells can coexist, but most of them are mainly one. The tumor growth is slow, and the speed can be different in different periods. If it develops too fast, its center can liquefy cysts and the tumor itself. Vascular distribution More from nerves but no nerve from walking. It is the most common type of intracranial neuroma, accounting for 7% -12% of intracranial tumors and 80-95% of cerebellopontine angle tumors. Clinically, pontine cerebellar horn syndrome and increased intracranial pressure are the main manifestations. It is a benign tumor. Early diagnosis and early treatment are effective. Surgery is the only way for patients with large tumors and intracranial hypertension.