The following results have been obtained from 182 cases confirmed of what by flexible bronchoscopic examination. 1) Among the 178 bronchoscopic examinations, 57 cases were mass lesion, which was the most common. Of these, 71.9ro of mass lesions were bronchogenic carcinoma, which included squamous cell cancer (26.3%, 15/57), adenocarcinoma (10.5%, 6/57), small cell cancer (14.0%, 8/57), large cell cancer (5.0%, 3/57), and undifferentiated cancer (15.8%, 9/57). 2) Single and multiple noncircumscribed lesions included pulmonary tuberculosis (43.1%, 19/44) and bronchogenic cancer (38.6%. 17/44). The common types of bronchogenic cancer were squamous cell cancer and adenocarcinom. 3) The hilar enlargement included bronchogenic cancer (57.4%, 27/47) and pulmonary tuberculosis (36.1%, 17/47). The most common type of bronchogenic cancer which had was shown hilar enlargement was the small cell cancer and was related to the early metastasis, but the adenocarcinoma was represented ty only 2 cases. 4) The cases showing atelectasis were bronchogenic cancer (53.3%, 16/30) and pulmonary tuberculosis (36.7%, 11/30). The most common form of bronchogenic carcinoma showing atelectasis was squamous cell cancer (62.5%, 10/16). 5) The 3 cases of the diffuse interstitial pattern had shown lymphangitic carcinomatosis. The 2 cases of squamous cell cancer had been involved with lymphatic metastasis contralaterally and also ipsilaterally, while 1 case had been involved with lymphatic metastasis from stomach cancer to the respiratory system. 6) According to a radiological-morphologic classification of the 178 cases, there were few exomples, except some X-ray patterns. Because of having more than 2 kinds of racdiological-morphologic patterns, the main lesions were not easy to find. There are different opinions about the lediological-morphologic classification. Therefore, it is nessary that many cases be analyzed, and a limited field of opinion is needed among X-ray interpretors.