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Flexible fibreoptic bronchoscopy was performed without fluoroscopic guidance in 70 patients with endoscopically nonvisible lung tumours. A diagnosis was established by transbronchial biopsy in 24 (34.28%) cases, by bronchial aspirate in five (7.14%) and by postbronchoscopic sputum in three (4.28%). The overall positive yield when all three specimens combined was 26/70 (37.14%). An important characteristic associated with a positive cytological or histopathological diagnosis was the size of lesion: a diagnosis was possible in 24/26(52.17%) cases when the diameter was more than 2.0 cm as compared to 2/24 (8.03%) in lesions less than 2 cm in diameter. The diagnosis was maximum in 16/22 (61.53%) cases if the lesions were situated between 2.5 to 5.0 cm from the hilum. According to the final diagnosis, squamous cell carcinoma and adenocarcinoma were the common peripheral tumours. We conclude that flexible fiberoptic bronchoscopy without fluoroscopic guidance is useful technique for diagnosis of endoscopically nonvisible lung tumours.