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A. Contrast-enhanced chest CT image shows 1.3-cm solid nodule in right upper lobe (arrow). B. CT-guided PTNB was performed by using 22-gauge aspiration needle, and pathologic examination showed adenocarcinoma of pulmonary origin (true-positive result). Patient underwent right upper lobectomy, and lesion was confirmed to be adenocarcinoma in pathologic examination. PTNB = percutaneous transthoracic needle lung biopsy
