Single-level bilateral facet joint hypertrophy causing thoracic spinal canal stenosis.

Thoracic canal stenosis caused by hypertrophy of the posterior spinal elements is rare. We report an unusual case of bilateral zygapophyseal joint hypertrophy occurring solely at thoracic levels T10-11, producing bilateral leg weakness and numbness. The diagnosis was established using CT scans and MRI. A wide decompressive laminectomy and posterolateral bone fusion was performed. Postoperatively there was a marked improvement in symptoms and signs. We present a literature review on bilateral single-level facet joint hypertrophy producing canal stenosis and report our experience.