胸腔积液病人由血液学和生化检查不能明确病因者占20—25％,应把肾病作为这些病例的病因加以考虑。引起肾性胸腔积液的有:①肾病综合征,②尿毒症性胸膜炎,③尿胸,④腹膜透析,⑤肾周围脓肿,⑥急性肾小球肾炎。肾病综合征病人近2O％发生胸腔积液。这是由于膨胀压(Oncotic pressure)降低所致,多发生于两侧肺 Patients with pleural effusion by hematology and biochemical tests can not be a clear cause of 20-25%, kidney disease should be considered as the cause of these cases. Kidney caused pleural effusion are: ① nephrotic syndrome, ② uremic pleurisy, ③ urinary thoracic, ④ peritoneal dialysis, ⑤ peritoneal abscess, ⑥ acute glomerulonephritis. Nephrotic syndrome in patients with pleural effusion nearly 2O%. This is due to the decrease of Oncotic pressure, which occurs mostly in both lungs