胸腺瘤是成年人前上纵隔最常见的肿瘤［１］，附着于心包，与纵隔内大血管关系密切，镜检无特殊组织或细胞学诊断特点，是否外侵是判断良恶性的重要依据［２］。近年来，随着影像学的进步及针吸免疫组化染色技术的开展，胸腺瘤的诊断水平进一步提高。令人兴奋的是以往认为... Thymoma is the most common tumor of the anterior superior mediastinum in adults [1]. It adheres to the pericardium and is closely related to the large blood vessels in the mediastinum. There is no special tissue or cytological diagnosis characteristic of microscopic examination. Whether external invasion is an important basis for judging benign and malignant diseases [2] ]. In recent years, with the progress of imaging and the development of needle immunohistochemical staining, the diagnostic level of thymoma has been further improved. It’s exciting to think that...