Osteosclerosis of the ligamentum flavum is a pathophysiological result of the transformation of fibrous tissue into bony tissue in the interspinal ligamentum flavum [1]. Osteosclerosis of the ligamentum flavum can occur in the cervical, thoracic and lumbar spine, but is most common in the thoracic spine, especially in the lower thoracic spine (T9-T12) [2-5], and is most common in adults aged 40-60 years. Osteosclerosis of the ligamentum flavum is one of the most common and important causes of thoracic spinal stenosis [6-7]. As the degree of ossification of the ligamentum flavum gradually increases, the adjacent vertebral plates, articular processes and dura mater may become hypertrophic and ossified, ranging from incomplete ossification to complete ossification, and finally involving the dura mater, resulting in ossification of the dura mater and compression of the thoracic spinal cord by the huge bony tissue, resulting in corresponding clinical symptoms and signs [8].