[Transbronchial puncture and instillation of contrast medium for the radiographic visualization of a mediastinal cyst (author's transl)].

A new method for preoperative diagnosis of mediastinal cysts is described. A transbronchial puncture of a mediastinal cystic tumor was performed in one patient with a mediastinal enlargement and stenosis of the right main bronchus. Afer aspiration of fluid material a water-soluble contrast medium was instilled under fluoroscopic control via a normal biopsy needle. Summarizing their experiences the indications for this new technique is discussed.