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目的 A 41 years old female complained of cough and dyspnea for 4 moths after a surgery of mediastinum 6 months ago due toCastleman disease.Her LFT was normal before the operation.Physical examination showed expiratory rhonchi at rest.scan was normal.Lung function test showed FEV1pre 0.82L,FEV1post 0.85L,FEV1chang%3.13%,and FEV1/FVCpost 35.57%.