Abstract
<h3>History</h3> A 32-year-old man presented with bilateral progressive paresthesia and numbness over a two-year period following a motor vehicle accident. He reported the recent onset of urinary incontinence. On examination, decrease in pain and sensation to touch and pinprick in both lower extremities, more marked on the left side, was elicited. The findings of electromyographic studies were consistent with involvement of the posterior primary rami at the T10-11 level. Lateral roentgenograms of the thoracic spine showed a triangular bony density projecting into the spinal canal (open arrow) at the site of T10-11 (Fig 1). Low-dose metrizamide myelography with computed tomography (CT) was accomplished. The CT scans will be demonstrated subsequently. An operative procedure was performed. <h3>Diagnosis</h3> Ossification of the ligamentum flavum at T10 through T12 causing myelopathy. A CT scan using low doses of metrizamide shows ossification of the ligamentum flavum (LF) (open arrows), compressing the spinal cord at T10-11
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