The stiff aching back. The differential diagnosis of ankylosing spondylitis.
D002114:Calcinosis / Q000175:diagnosis; D003937:Diagnosis, Differential; D010505:Familial Mediterranean Fever / Q000175:diagnosis; D006801:Humans; D007015:Hypophosphatemia, Familial / Q000175:diagnosis; D009794:Ochronosis / Q000175:diagnosis; D013122:Spinal Diseases / Q000175:diagnosis; D013166:Spondylitis / Q000175:diagnosis; D013167:Spondylitis, Ankylosing / Q000175:diagnosis*; D014394:Tuberculosis, Osteoarticular / Q000175:diagnosis