In a middle aged male having back pain, syndesmophytes involving 4 continous veebrae are seen on Xray. The patient has ?: (A) DISH, (B) Ankylosing spondylitis, (C) Rheumatoid ahritis, (D) Osteoahritis
Answer is B. Ans. is 'b' i.e., Ankylosing spondylitis Back pain with syndesmatophytes in a middle aged man suggest the diagnosis of ankylosing spondylitis.