Identification and surgical treatment of primary thoracic spinal stenosis.

We report the surgical treatment results for 7 patients (4 men, 3 women; mean age, 49 years) who presented with myelopathy caused exclusively by primary thoracic spinal stenosis, predominantly in the lower thoracic spine. (Patients with concurrent ascending lumbosacral degenerative disease were excluded.) All patients received extensive nonoperative treatment before referral to our center. Surgical treatment consisted of wide posterior decompression and instrumented fusion (5 cases), anterior vertebrectomy and fusion (1), and anterior vertebrectomy with autograft strut followed by wide posterior decompression and instrumented fusion (1). Mean operative time was 313 minutes, mean blood loss was 944 mL, and there were no major postoperative complications. Minimum follow-up was 2 years. Five patients had significant improvement in myelopathy and were ambulating normally, 1 had modest improvement in ambulation, and 1 remained wheelchair-bound. All patients achieved solid radiographic fusions. After presenting these case studies, we review the current literature on treatment effectiveness. Primary thoracic spinal stenosis should be considered in patients who present with isolated lower extremity myelopathy, particularly when no significant pathologic findings are identified in the cervical or lumbosacral spine. Expedient wide decompression with concurrent instrumented fusion is recommended to prevent late development of spinal instability and recurrent spinal stenosis.