Summary
A pair of identical twins suffering from ankylosing spondylitis is reported. One brother developed an earlier-onset disease and showed ossification of the posterior longitudinal ligament and the flavum ligament in his cervical spine.
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Olivieri, I., Pappone, N., Padula, A. et al. Ossification of the posterior longitudinal ligament in one of a pair of identical twins concordant for ankylosing spondylitis. Clin Rheumatol 13, 309–311 (1994). https://doi.org/10.1007/BF02249033
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DOI: https://doi.org/10.1007/BF02249033