Initial report of transesophageal EUS-guided intraparenchymal lung mass core biopsy: Findings and outcomes in two cases.

EUS is most commonly used to evaluate and sample lesions of the abdomen but has only been used on rare occasions to evaluate and sample lung lesions. Prior reported cases of EUS sampling of lung lesions were performed by fine-needle aspiration. We present what is believed to be the first reported cases of EUS-guided core biopsy of intraparenchymal lung lesions through two separate case reports. Both patients had the upper lobe lesions not amenable to bronchoscopy or endobronchial ultrasound, and both patients underwent core biopsy without adverse event. This report of two cases shows that EUS-guided core biopsy of intraparenchymal lung lesions is technically possible and may not necessarily result in adverse events such as hemorrhage, pneumothorax, or infection.