Medstinoscopy has been used in the diagnosis for detection of mediastinal Iymph nodes invasion by bronchogenic carcinoma and metastatic cancer. A 19-year-old male complained of chest disconyortness and dysphagia. A chest roentgenogram showed. the right paratracheal mass. Computed topography findings were consistent with a diagnosis of bronchogenic cyst, and excision of cyst was accomplished via the mediastinoscopy thus avoiding thoracotomy.