Synovial cyst of the thoracic spine causing myelopathy.
STUDY DESIGN: Pre- and postoperative follow-up of a patient with progressive myelopathy caused by a thoracic synovial cyst developing within 6 months. OBJECTIVE: To present the natural history of a developing thoracic synovial cyst and to highlight this unusual case. SUMMARY OF BACKGROUND DATA: Thoracic synovial cysts are a rare finding and can produce myelopathy from spinal cord compression. The patient presented with progressing spasticity and sensory loss of both legs. Hereditary motor-sensory neuropathy was suspected and excluded by a molecular genetic examination. The cause of deterioration was finally found in an MRI of the thoracic spine revealing the rapid growth of a synovial cyst that had been detected in a previously performed MRI 6 months earlier. METHODS: Clinical and MRI details are presented documenting the natural history and development of a thoracic synovial cyst causing myelopathy. RESULTS: The thoracic synovial cyst was successfully decompressed. Stabilization and fusion were not performed. The myelopathy resolved after surgery and the patient stays well in the 6-months follow-up. CONCLUSION: Although thoracic synovial cysts are a rare finding, they have to be considered as a source for progressive myelopathy. If an MRI of the spine does not reveal any pathologies, it should be repeated even after a short period of time if the patient's condition deteriorates, continuously to detect newly developed findings.[1]References
- Synovial cyst of the thoracic spine causing myelopathy. Merkle, M., Psaras, T., Tatagiba, M., Danz, S., Schmidt, F. Spine (2009) [Pubmed]
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