Thoracic skeletal deformation aging, showing barrel, lung thoracic part of the expansion of compensation for changes in space or lung degeneration and pathology showed alveolar atrophy, thinning, decreased flexibility, expansion of terminal alveoli and lung tissue and irreversible structural damage, change, slow disease progression . clinical manifestations of early asymptomatic, with the course of the disease progress or the performance of chest tightness, combined with respiratory infections, difficulty in breathing.

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