1. Ventricular meningioma: It is usually found in the cervical medulla and conus terminalis. The former is located in the spinal cord medulla and grows around the central canal, while the latter is mostly located in the subarachnoid space of the lumbar segment. Those located in the medulla exhibit signs and symptoms of intramedullary tumors, while those located in the end filaments exhibit symptoms of cauda equina tumors. The tumor is hypo- or iso-signal on T1-weighted images and hyper-signal on T2-weighted images on MRI, with enhancement of the tumor. Ventricular meningioma often has cavity formation in the spinal cord at both ends. In case of intra-tumor hemorrhage or cystic degeneration, a mixed signal of high, equal and low signal may appear. 2.Astrocytoma: It originates from astrocytes in the spinal cord, often located in the cervicothoracic segment and grows along the longitudinal axis of the spinal cord, mostly involving 3 to 4 segments, and a few may invade the whole spinal cord. MRI performance is similar to that of ventricular meningioma, but astrocytomas often do not have obvious secondary cavity formation. 3. Angioblastoma: It is a benign tumor, most common in young people and middle-aged people, and is found in the cervicothoracic medulla, usually in the dorsolateral part of the spinal cord. Most of them are solid, with intact envelope, dark red, often with obvious blood supplying arteries and varicose draining veins, and there may be cavity formation in the spinal cord around the tumor. Rarely, the tumor is cystic. The tumor may be solitary or multiple, or may be associated with cerebellar or medullary hemangioblastoma, retinal, renal, pancreatic and cutaneous hemangiomas. The tumor is isosignal or slightly hyper-signal on T1-weighted images and hyper-signal on T2-weighted images on MRI. The tumor is small, confined, and uniformly signalized with clear margins. After enhancement, the tumor is clearly enhanced. In the case of cystic tumor, MRI shows a cyst with small attached tumor nodules. Sometimes, thickened vascular shadow of the tumor can be seen in and out. Spinal angiography shows stained tumor nodules, blood supply arteries and drainage veins. 4.Lipoma: It is more common in 11-30 years old. It is more likely to occur in the thoracic medulla and conus. The former lesion is mostly located under the soft spinal membrane of the spinal cord, which can penetrate into the medulla along the blood vessels and has no obvious boundary with the surrounding tissues. The clinical manifestations corresponding to the lesion segment appear, and the deep sensory deficits are more pronounced because of more invasion of the dorsal aspect of the spinal cord. The latter is often located in the extramedullary dura and is associated with status myelomeningocele, spinal canal closure insufficiency and subcutaneous lipoma. The clinical manifestations are unilateral or bilateral spastic paralysis of the lower limbs, ankle-to-toe deformity and sphincter dysfunction. Spinal radiographs show enlarged spinal canal and spina bifida in the lesioned segment. ct scan cat tumors are hypointense. mri examinations of lipomas show high signal on t1-weighted, proton-weighted, and t2-weighted images with clear borders, no cystic changes, and no spinal cavity formation. Cone tumor can also show low spinal cord, spina bifida and subcutaneous lipoma. 5.Nerve sheath tumor: Intramedullary nerve sheath tumors are rare, benign tumors, more males than females, with age of onset around 40 years old, usually located in the cervical cord, often dorsal and to one side, with complete envelope, round or oval. MRI shows iso- or slightly hyper-signal in T1-weighted phase and hyper-signal in T2-weighted phase. After enhancement, the tumor is moderately uniformly strengthened with clear borders, and there may be cavity formation in the surrounding spinal cord. 6.Epidermoid cyst: It is a benign congenital tumor, which is rarely found in the medulla. It is usually found in the conus, often accompanied by low spinal cord, and can also occur in the thoracic medulla. The cyst is hypodense on CT scan and does not intensify after enhancement, while on MRI the epidermoid cyst is mostly low signal in T1-weighted phase and high signal in T2-weighted phase, sometimes with mixed high and low signal. Both of them are generally non-enhancing after enhancement. 7. Intestinal-derived cysts: rare congenital tumors, often located in the cervical or upper thoracic medulla, can occur in the intramedullary, extramedullary dura or connected with cysts outside the spinal canal. CT shows local enlargement of the spinal canal, often accompanied by spinal deformity, and a low-density cystic lesion with clear borders; MRI shows that the fluid signal inside the cyst is close to that of cerebrospinal fluid.