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Lung cancer is the most common cancer diagnosed worldwide. It is also the foremost contributor to cancer-related mortality, resulting in 1.38 million deaths per year worldwide. There are various diagnostic modalities for lung mass lesions including bronchial washing (BW), bronchoscopic needle aspiration (BNA) and bronchoscopic biopsy (BB). To determine sensitivit Objectives:- y (Sn), specicity (Sp), positive predictive value (PPV) and negative predictive value (NPV) of both BW and BNA as individual test and as combined tests, taking BB results as gold standard. This was an observational cross-sectional study conducted in a tert Material and methods:- iary care hospital of this part of NorthEast India over a period of two years (July 2020 to June 2022). 55 cases of lung mass lesions underwent BW, BNA and BB during the study period & were analysed. The study found highest sensitivity in combined BNA & BW (95%), highest Result:- specicity in BNA (81%), highest PPV in BNA (95%) and highest NPV in combined BNA & BW(88%). This study concluded that BNA i Conclusion:- s a better diagnostic modality than BW and if BW is done it should always be supported with BNA which contribute to more precise diagnosis

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