Motor conduction tract involvement is one of the clinical manifestations caused by primary intraspinal tumors. When the cervical spinal cord is partially compressed, with the increase of tumor, the symptoms of spinal cord conduction bundle compression will gradually appear on the basis of the original symptoms, such as compression of spinal cord thalamus bundle, which may lead to hyperalgesia or disappearance of pain and temperature sensation below the contralateral side of the lesioned segment; compression of posterior bundle, which may lead to hyperalgesia of deep sensation; involvement of motor conduction bundle, which may lead to upper motor neuron paralysis in the limbs below the ipsilateral lesioned segment, and spinal cord hemisection syndrome is a specific symptom of intradural extramedullary tumor. The spinal cord hemisection syndrome is a specific symptom of extramedullary tumor. As the cervical spinal cord is partially compressed during the period of tumor enlargement, the symptoms of spinal cord conduction bundle compression gradually appear on the basis of the original symptoms, such as compression of spinal cord thalamus bundle, which may produce hyperalgesia or disappearance of pain and temperature sensation below the ipsilateral lesion segment; compression of posterior bundle, which may produce hyperalgesia of deep sensation; and involvement of motor conduction bundle. What are the examination methods of primary intraspinal tumor? 1.Vertebral puncture and cerebral fluid examination The kinetic changes and increased protein content of cerebrospinal fluid is an important basis for the early diagnosis of intravertebral tumor. When intravertebral tumor is suspected, Quaker test and cerebrospinal fluid examination should be done as soon as possible. 2.X-ray plain film examination About 30% to 40% of patients can see bone changes. On conventional frontal and lateral spine films and oblique films, common signs include: (1) enlargement or destruction of intervertebral foramen. (2) Enlargement of the spinal canal, manifested by widening of the spacing between the vertebral roots. (3) Bone changes in the vertebral body and attachments, as seen by bone defects in the vertebral body and destruction of the vertebral arches. (4) Calcification in the spinal canal, occasionally seen in a few spinal meningiomas, teratomas and hemangioblastomas. (5) paravertebral soft tissue shadows, because most tumors in the vertebral canal are benign, there is often no bone abnormalities in the early x-ray film, sometimes only in the late stage can be seen in the arch root spacing widening, thinning of the cortical bone of the vertebral canal wall, enlargement of the vertebral canal and other indirect signs, for dumbbell-shaped vertebral tumors, such as intervertebral foramen enlargement, x-ray examination, can exclude spinal deformity, tumors and other causes of spinal cord compression, is still an indispensable It is still a routine examination. 3, myelography is currently one of the effective methods to show the occupying lesions in the spinal canal, can be selected iodine oil (such as iodophenyl ester) or iodine water contrast (such as amipaque or omnipaque) to perform cervical spinal canal imaging, especially through the cerebellar medullary pool injection imaging is easy to confirm the diagnosis, showing the contrast agent in the non-disc plane of the cup-shaped defect or obstruction, the literature reported 180 cases of nerve sheath tumor, of which 150 cases of imaging: the nerve sheath tumor, the nerve sheath tumor. Among them, 150 cases showed cupped filling defects in 106 cases, horizontal cross-sectional defects in 18 cases, oblique cone-like defects in 7 cases, trumpet-like defects in 5 cases, and bead-like defects in 4 cases. omnipaque is a second-generation non-ionic iodine water-soluble contrast agent, which is clear, safe and reliable, and can identify spinal cord tumors according to spinal cord enlargement, displacement and subarachnoid obstruction, and make correct diagnosis when combined with increased cerebrospinal fluid protein. Due to adhesions and other reasons, sometimes the obstruction plane does not necessarily represent the real boundary of the tumor. Ni Bin et al. reported that in 4 cases of 137 intravertebral tumors, the obstruction plane differed from the surgical investigation result by 1/4 to 1 vertebral body, unless secondary imaging was performed. Then CT scan or mri examination can be performed to obtain more information of tumor lesion. 4.CT examination CT scan has sensitive density resolution and can clearly show the spinal cord, nerve roots and other tissue structures in cross section, which can clearly show the soft tissue shadow of the tumor and help the diagnosis of intravertebral canal tumor, which is not available by traditional imaging methods. CT can basically determine the segmental distribution and lesion scope of the tumor in the spinal canal, but it is difficult to distinguish it from the normal spinal cord parenchyma. CTM (CT plus spinal cord contrast) can show the relationship between the whole spinal cord and the tumor, and differentiate the spinal cord tumor from the spinal cord cavity. MRI is a more ideal examination method, without the side effects of ionizing radiation, it can observe the spinal cord in three dimensions, which can show the boundary between tumor tissue and normal tissue, the site, size and scope of tumor, and directly outline the tumor, show its longitudinal and lateral expansion and the relationship with surrounding tissue structure, which has become the preferred method for spinal cord tumor diagnosis. The MRI imaging of intramedullary tumors shows that the spinal cord is enlarged, and the tumors show different signal intensities in different pulse sequences, which can be distinguished from spinal cord cavernous disease. The axial image shows that the cervical spinal cord is extruded to one side and the tumor is oval or crescentic in shape. For dumbbell-shaped tumors that protrude outward through the intervertebral foramen, the continuity of the mass in and out of the spinal canal is visible, and because MRI directly performs sagittal imaging, the scope of examining the spinal cord is larger than that of CT scan, which is incomparable to CT, and in MRI can show the size, location MRI can show the size, location, and tissue density of the tumor, especially the application of paramagnetic contrast agent gd-dtpa can clearly show the contour of the tumor, so MRI is very important for confirming the diagnosis and surgical positioning, and CT is far inferior to MRI in this regard.