Purpose:To evaluate the efficacy of using z shape spiral metallic stent in the treatment of tracheal stenosis after lung resectomy and carinal plastic surgery.Materials and meth- ods:Two patients suffered from lung cancer received lung resectomy and carinal plastic surgery, thereafter,tracheamalacia occurred in one patient and intratracheal granulation tissue proliferation in the other,both resulted in tracheal stenosis.Spiral metallic stents were inserted in the narrow seg- ment under bronchoendoscopy.Results:Dyspnea relieved immediatly and the patients were soon free fron respirator and returned home.A 2.5-year-follow-up showed no recurrence in the first patient.Conclusion:Intratracheal insertion of stent is an effective way in treating tracheal stenosis.

Purpose:We observed and compared the therapeutic effects of CO_2 and dehy- drated ethanol as sclerosing agent,in percutaneous interventional methods for treatment of hepatic and renal cysts,Materials and methods:Twenty-two simple cysts,14 in livers,8 in kidneys,af- ter percutaneous puncture and aspiration,we instilled CO_2 or dehydrated ethanol into the cysts once, twice or thrice with followed-up for 2 to 29 months,Results:All the 22 cysts in 22 patients were better after treatment especially of them,including 8 of 12 cases(66.7%)treated with dehydrated ethanol only once.The maximum diameters of 8 renal cysts(8/8,100%)after one treatment re- duced to less than 2cm in the follow-up,comparing with only 5 of 14 hepatic cysts(5/14,35. 7%).Conclusion:1)Pereutaneous interventional method by guidance of ultrasound is safe and ef- fective in simple hepatic or renal cyst treatment.2)CO_2 is similar to dehydrated ethanol as a scleros- ing agent.3)The therapeutic effect of simple renal cyst is better than that of hepetic cyst.