The location of these tumors was as follows: trachea 11, carina 1, right main bronchus 3, and left main bronchus 4. X-ray menifestations on plain films may be normal, while on tomograms or bronchograms were demonstrated.

• 肿瘤位置分布:气管11例,隆突1例、右主支气管3例、左主支气管4例。 有些病例的X线所见在平片上可以表现为阴性,而在体层和支气管造影片则可以得到显示。