Acquired esophagobronchial fistula is relatively rare disease. Its causes are malignancy of esophagus or bronchus, infection, trauma, and diverticulum of esophagus. Malignant esophagobronchial fistula is more frequent than benign origin. The patient was 21-year-old female and had typical Onos sign. On esophagogram, fistulous tract was identified between esophagus and left lower lobe bronchus. The cause was nonspecific inflammation of mediastinum. The fistulous tract was resected and reinforced by mediastinal pleura. Postoperative course was uneventful.