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What is A 29-year-old man complains of back pain for several months. It takes him over 2 hours to limber up in the morning. His x-ray is shown in Figure given below. Which of the following is the most likely diagnosis? and explain in detail?
The x-ray reveals typical evidence of sacroiliitis, with widening of the joints, sclerosis, and evasions. Similar findings can be seen in psoriatic and enteropathic spondyloarthropathy.