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(A) Invasion was observed into the trachea/bronchus (green arrow) and the pleura and the lung in the upper lobes (blue arrows), but invasion of the heart and the pericardium (white arrow) was not observed. The black arrows point to the esophagus. (B) Tumor invasion was observed into the trachea/bronchus (green arrows) and the heart and the pericardium (white arrow), but invasion of the pleura and the lung (blue arrows) was not observed.
