A 23-year-old man notices a gradual but progressive increase in breathing difficulty. He has a long history of back pain with prolonged morning stiffness. He has also had an episode of iritis in the past. On examination, there is reduced range of motion in the lumbar spine with forward flexion and pain on palpation of the sacroiliac joint and surrounding soft tissue. X-rays of the pelvis show erosions and sclerosis of the sacroiliac joint. Which of the following is the most likely pulmonary complication of this condition?
Correct Answer: fibro cavitary disease
Description: Ankylosing spondylitis is characterized by bilateral upper lobe fibrosis, which may be complicated by fibro cavitary disease. The pulmonary involvement is rare and is usually very slowly progressive. The cavities can be colonized by Aspergillus.
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