Immediate postoperative regression of retroodontoid pannus after lateral mass reconstruction in a patient with rheumatoid disease of the craniovertebral junction. Case report.

The authors report the case of a 35-year-old man who had polyarthritic affliction with rheumatoid disease. He presented with complaints of quadriparesis that had progressed over the course of 2 years. Investigations revealed telltale evidence of rheumatoid disease of the craniovertebral junction with retroodontoid pannus, basilar invagination, and "fixed" atlantoaxial dislocation. The patient underwent lateral mass reconstruction with distraction of the facets and impaction of a spiked metal spacer and bone graft within the joint. Investigations done in the immediate postoperative phase showed complete disappearance of retroodontoid pannus in addition to reduction of basilar invagination and atlantoaxial dislocation. He had remarkable and sustained relief from symptoms. The authors also review the pathogenesis and treatment of retroodontoid pannus.