Increased sweating after cold is one of the symptoms of spinal cord cavitation. Spinal cord cavitation is a bizarre sweating phenomenon of increased sweating after cold, accompanied by decreased temperature, hyperkeratosis of fingertips and nails, atrophy, and loss of luster. Due to the loss of pain and temperature sensation, burns and bruises and trauma are likely to occur. Late stage patients develop urinary and faecal disorders and recurrent urinary tract infections. 1.Symptom examination Age of onset 31-50 years old, rare in children and the elderly. There are more men than women, and a family history has been reported. The clinical manifestations of spinal cord cavitation are threefold, and the degree of symptoms is greatly related to the early and late development of the cavity. The disease generally progresses slowly, and the early symptoms appear in a segmental distribution, affecting the upper extremities first. When the cavity expands further, the gray matter in the medulla and the white matter conduction bundles outside it are also involved, and conduction bundle dysfunction occurs below the cavity cavity. As a result, the symptoms are limited and mild in the early stages of the disease, while in the later stages, the symptoms are widespread and even paraplegic. Depending on the location of the cavity in the cervical and upper thoracic segments of the spinal cord, the cavity is located on one side or centrally, and segmental sensory deficits in the upper extremities and upper thoracic segments appear unilaterally, often characterized by segmental dissociative sensory deficits. Pain and temperature sensation are reduced or absent, but deep sensation is present. The symptoms may also be bilateral. The cervical and thoracic segmental cavities affect the anterior horn of the spinal cord, and symptoms of flaccid partial paralysis of one or both upper extremities appear. The symptoms are muscle weakness and decreased muscle tone, especially atrophy of the interosseous and interosseous muscles of both hands is most obvious, and in severe cases, claw-shaped hand deformity is present. If the lower trigeminal nerve root is affected, there is a central type of nociceptive and thermo-sensory impairment on the ipsilateral side of the face, and the facial detached sensory loss forms the so-called “onion-like distribution”, accompanied by weakness of masticatory muscles. If the vestibulocerebellar tract is involved, vertigo, nausea, vomiting, gait instability and nystagmus may occur. In one or both lower extremities, supramotor partial paresis occurs, with hypertonia, loss of abdominal wall reflexes and positive Babinski’s sign. In advanced cases, the paralysis is more severe. The cavity involves the sympathetic spinal center of the lateral horn of the spinal cord (cervical 8 and thoracic 1), and Horner’s syndrome appears. The lesion may damage the skin of the corresponding segment, limb and trunk with abnormal secretion, with hyperhidrosis or hypohidrosis being the only signs of abnormal secretion. Hypohidrosis may be confined to one side of the body, called “hemianopsia”, and is more commonly seen on one side of the upper body, or one upper extremity or half of the face. Often the corneal reflex is also diminished or absent, as neurotrophic keratitis can lead to bilateral corneal perforation. Another bizarre sweating phenomenon is increased sweating when cold, accompanied by a decrease in temperature, hyperkeratosis of the fingertips and nails, atrophy, and loss of luster. Due to the loss of pain and temperature sensation, burns and bruises and trauma are likely to occur. Late stage patients develop urinary and fecal disorders and recurrent urinary tract infections. 2, MRI examination of the spine MRI examination of the spine is the correct diagnosis of spinal and spinal cord disease MRI is significantly higher than CT, the source of disease display, accurate localization, can be the preferred method of examination MRI can accurately evaluate the spine and a variety of pathological conditions, T1-weighted imaging is suitable for the evaluation of intramedullary lesions, spinal cord cysts, bone destruction lesions, while T2-weighted imaging is used to evaluate bone lip hyperplasia, intervertebral disc degeneration lesions and acute spinal cord injury. Bone structural changes such as primary bone tumors, tumor-like disorders, metastases and infections have specific manifestations on MRI, and normal bone cancellous matter shows high density on T1-weighted imaging, as opposed to vertebral cavernous hemangioma or cavernous vascular endothelial cell tumor.