The histopathological and immunohistochemical diagnosis represents an essential stage in the management of lung tumours. Bronchoscopy is compulsory - it offers data regarding tumour extension and may lead to histo-/cytological diagnosis. When the endobronchial tumour expression is missing, the transbronchial biopsy at the level of the tumour may offer the tissue necessary for histological typing. The method is rarely used and usually guidance is performed through one of the following methods: fluoroscopy, computed tomography, endobronchial ultrasound, electromagnetic navigation. Through these guidance methods, the transbronchial biopsies has a rate of success, according to literature, of 62-77%. In the Thoracic Surgery Clinic of the Bucharest Oncology Institute, in the period January 2015 - February 2017, we performed peripheral transbronchial biopsies in 36 patients with an imaging diagnosis of lung tumour, without histopathologic diagnosis. Biopsies have not been guided during the procedures, using as a reference only the pre-procedure CT guidance. The histopathologic diagnosis could be stated based on tissue appropriately collected from 26 patients. The diagnosis rate for the tumoral transbronchial peripheral biopsies performed in this period is 72.22%, an excellent value considering that biopsies have been performed without any guidance method. [ABSTRACT FROM AUTHOR]