男性，54岁，进行性呼吸困难、干咳。药物毒性，环境暴露，胶原血管疾病已经被排除。
A 54-year-old man presented with progressive dyspnea and non-productive cough. Drug toxicity, environmental exposure, and collagen vascular disease were ruled out.
心肌纤维化是由于心肌间质胶原沉积增多，各型胶原比例失调所导致，可发生于多种心血管疾病。
Myocardial fibrosis is caused by overdeposition of myocardial interstitial collagen and proportion disorder of all kinds of collagen, and it occurs in many heart diseases.
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