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(A) The azygos lobe was observed under the azygos vein, and a tumour was also confirmed near the azygos lobe. (B) The tumour originated from the origin of the recurrent laryngeal nerve. (C) The tumour was sharply resected and removed so as not to damage the recurrent laryngeal nerve. (D) The tumour was diagnosed as schwannoma based on the histopathology
