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Hypertrophic atlantoaxial ligaments: an unusual cause of compression of the upper spinal cord
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The craniovertebral junction can be affected by several pseudotumorous masses extradurally located, such as rheumatoid panus, hypertrophic non-union of odontoid fracture, post-traumatic cicatrix, synovial cysts, tumorous calcium pyrophosphate dihydrate crystal deposition, tophaceous gout, calcification of the posterior longitudinal ligament, synovial disease-like pigmented villonodular synovitis, and synovial chondromatosis.1-5 Hypertrophy of the atlantoaxial ligaments as a consequence of degenerative disease was recently recognised as an individual …