Abstract
It has been reported that the lung is an organ having the most possibility of frequent metastases from any extrathoracic tumors. The so-called endobronchial metastasis, however, may rarely be found in the central large airway to form a tumor in the bronchial orifice, and it is necessary that such a tumor, if ever detected, should be distinguished from the central type primary bronchogenic carcinoma. The most frequent origin of the metastasis to the lung is the carcinoma of kidney. Two cases of endobronchial metastases are reported here. The first case was 65-year-old man whose main complaints were cough and fever with abnormal shadow on chest roentgenogram. Bronchoscopic examination showed a white irregular mass in the left upper lobe bronchus, suggesting squamous cell carcinoma of the lung or bronchial adenoma. Only necrotic tissues were gained by repeated transbronchial biopsies. Renal adenocarcinoma was revealed by transbronchial lung biopsy of the lung field lymphangitic metastasis. The second case was 53 year-old man who was admitted for evaluation of bloody sputum and atelectasis in the right middle lobe on chest roentgenogram. He recieved right nephrectomy for renal cancer 3 years ago. In bronchoscopy, a white massive lesion was detected in the orifice of right B^5_a. Endobronchial metastasis from renal adenocarcinoma was diagnosed by tumor biopsy.
