Ankylosing spondylitis does occur in children and your daughter's ymptoms are suggestive of this diagnosis. However the illness usually starts in adolescence and in the twenties and the genetic marker test is negative. Your daughter his being treated on medications with serious potential side effects and she is not really showing any improvement. I strongly agree that a definite diagnosis is essential here and great caution should be exercised when deciding on treatment. A second opinion would be a good idea.
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