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Widened spinal canal at level of malpositioned screws DDX?

Hello, during neurosurgery lag screws were malpositioned at C5-C6 and C6-C7. Revision surgery occurred 4 days later. Decompression was not performed.

A year later patient reports bilateral upper extremities weakness, pain, paresthesia with touch and proprioception symptoms as well as shooting pain and weakness on extension of arms. Patient reports bilateral medical elbow pain and inability to hold even lightweight items with arms extended Unfortunately, patient reports bilateral lower extremity “deep ache” and “heavy feeling” as well as bladder and bowel changes.  

Recent Cervical MRI demonstrates patent canal throughout however, with widening of canal at levels C5-C6 and C6-C7 post-operative changes.

Recent EMGs demonstrated no significant findings with spinal blocks C6, C7, T1 successfully demonstrating temporary relief.

Suggested differential diagnoses, anyone?
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