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전종격동 하부에 심장과 연접한 이소성 흉선종은 폐암뿐 아니라 흉선종, 생식세포암, 림프종, 전이성 종양 등의 여러 질환과 감별이 필요하다. 병리조직상으로는 이소성 흉선종에 대한 주의가 없는 경우, 미분화상피암, 암성병변의 림프절 전이, 또는 림프구가 우세하게 관찰되는 경우 림프종 등으로 오진될 수도 있으므로 감별진단에 있어 주의가 필요하다. 또한 낭성 흉선종은 이러한 감별진단을 더욱 어렵게 한다.


A thymoma commonly occurs in the superior mediastinum or the upper part of the anterior mediastinum but can be located in other places in rare cases. Cystic degeneration in a thymoma is a relatively common but focal event. In rare cases, the process proceeds to the extent that most if not all of the lesion becomes cystic. We report a case of a patient with a paracardial cystic thymoma in the lower aspect of the anterior mediastinum. A 49-year-old woman was referred to our hospital because of a mass discovered incidentally on a chest X-ray. She showed no symptoms or signs. Contrast-enhanced chest CT scan revealed a 5x5cm sized, well-marginated, right paracardial cystic mass with a curvilinear and oval enhancing solid portion. A Surgical resection was performed. The mass was discontinuous with normal thymic tissue. Microscopy revealed a type B1 thymoma with prominent foci of medullary differentiation according to the WHO classification. There was no capsular or local invasion. The postoperative course was uneventful and the patient was discharged in good health. (Tuberc Respir Dis 2007; 62: 331-335)