idiopathic dilatation of pulmonary artery

例句：

1. 1.The patient exhibited idiopathic symptoms without any known cause.
   病人表现出无已知原因的症状。
2. 2. The researcher found that the disease was idiopathic, meaning it had no known cause.
   研究者发现这种疾病是无已知原因的，意味着它没有已知的原因。
3. 3. The idiopathic condition is often difficult to diagnose and treat.
   这种无原因的状况往往难以诊断和治疗。