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The aim of the present study was to determine the indications for radial endobronchial ultrasound-guided transbronchial lung biopsy (rEBUS-D-TBLB) for the diagnosis of peripheral pulmonary lesions (PPL) located at the bronchopulmonary segments and subsegments. Data collected from 774 patients who underwent rEBUS-D-TBLB for suspected PPL, including clinical information, distribution of lesions, diagnostic spectrum and diagnostic rate, were collected and retrospectively reviewed. Additionally, the Wilcoxon signed-rank test was performed to analyze the diagnostic yield of lesions in bronchopulmonary subsegments under the lesion diameter limit of 3 cm. In total, 802 lesions were found in 774 patients. The diagnostic yield of rEBUS-D-TBLB for all lesions was 67.18%. Overall, 362 cases of malignant disease and 158 cases of benign disease were diagnosed, with sensitivities of 70.98 and 79.00% respectively. Lesions were distributed throughout the 18 bronchopulmonary segments of the lungs. The bronchopulmonary segments with &gt;5% of the majority of the discovered lesions were LB1+2, LB3, LB6, LB10, RB1-4 and RB9. The diagnostic yield of rEBUS-D-TBLB was found to be &gt;65% for lesions located at LB3, RB1-3 and RB9. Further rEBUS-D-TBLB examinations of the LB1+2a, LB6a and RB4b segments produced diagnostic yields of 81.25, 66.67 and 71.43% respectively. Finally, at segment RB4a, rEBUS-D-TBLB examination was more effective for lesions with diameters &gt;3 cm compared with lesions with diameters &lt;3 cm. The diagnostic yields for PPL distributed at LB1+2a, LB3, LB6a, RB1-3, RB4a (diameter &gt;3 cm), RB4b, and RB9 using rEBUS-D-TBLB were higher compared with for other segments, providing a theoretical basis for the clinical application of rEBUS-D-TBLB for the diagnosis of PPL in patients.

Analysis of indications for pulmonary peripheral lesions diagnosed using radial endobronchial ultrasound‑guided transbronchial lung biopsy