Loss of temperature sensation is one of the symptoms of spinal cord cavitation, which is caused by disruption of the thalamic fibers of the spinal cord. The spinal cavity is often surrounded by gliosis, which is the result of the formation of a tubular cavity in the spinal cord for a variety of reasons. The onset of the disease is slow, and the clinical manifestations are symptoms of nerve damage in the affected spinal cord segments, characterized by hyperalgesia, hyperalgesia and loss of temperature sensation, and dissociative sensory deficits with preservation of deep sensation, as well as motor deficits and neurotrophic deficits with damage to the long tracts of the spinal cord. The diagnosis of loss of warmth due to spinal cord cavitation is usually slow onset with progressive worsening. Patients often present with pain, numbness in the upper extremities and trunk, weakness in the upper extremities, especially in the hands, muscle atrophy or inflexible movements. 2.Motor abnormalities are mainly manifested as decreased strength of one or both upper limbs; muscle atrophy of the hand, and in severe cases, the little finger and ring finger cannot be straightened and the hand is claw-shaped; muscle atrophy of the neck, shoulder and arm. Some patients have lower limb movement disorders. Some patients with continuous progression of symptoms or without treatment may be paralyzed in the late stage. 3.Vegetational symptoms such as dry and less sweaty skin on one limb and trunk, deformation of joints of upper limbs, etc. 4.Some patients with spinal cord cavitation can have symptoms related to submicrocephalic tonsillar herniation malformation. 5, abnormal sensory manifestations of one or both sides of the upper extremity pain and temperature sensation is reduced or disappeared; or there may be numbness, serious hand burns or knife cuts without feeling; or accompanied by pain in the neck, shoulder, back or upper extremity. Some patients also have abnormal sensation in the lower limbs. 6, according to the clinical manifestations, combined with magnetic resonance imaging and X-ray plain film, the diagnosis of spinal cord cavitation and occipitocervical junction deformity can be confirmed.