原发性纵隔精原细胞瘤的CT诊断

目的 总结原发性纵隔精原细胞瘤的CT表现特征.方法 回顾分析10例经病理证实的原发性纵隔精原细胞瘤的CT资料.结果 肿瘤位于前纵隔9例,中纵隔1例,最大径为6.5～18.2 cm,平均12.3 cm,肿瘤均为软组织密度肿块,未检出囊腔及房性结构,亦未检出脂肪样密度、钙化或水样密度,肿瘤中心低密度9例,包绕大血管、心包7例,胸壁受累2例,纵隔或(和)锁骨上淋巴结肿大4例,肺部改变5例,双肺转移1例,胸腔积液4例,心包积液5例.结论 原发性纵隔精原细胞瘤绝大多数位于前纵隔,体积较大,呈无钙化或脂肪的实性肿块,中心常呈低密度,部分侵犯周围结构,在CT上有一定的特征性.

CT diagnosis of primary mediastinal seminoma

Objective To characterize the CT features of primary mediastinal seninoma. Methods CT scans of 10 cases with pathologically proved primary mediastinal seminoma were retrospectively reviewed.Results 9 of the 10 cases with the maximal dimension of 6. 5 ～ 18.2 cm( mean = 12. 3 cm) were located in the anterior mediastinum and 1 tumor was located in the middle mediastinum. All of the 10 tumors were solid masses and none of cavity, loculus, fat, calcification or fluid was detected. Areas of low density in the center of tumors were seen in 9 cases. Tumors encircling macrovascular or pericardium were seen in 7 cases. Chest wall invasion was detected in 2 cases. Enlarged lymph nodes in supraclavicular or mediastinum were identified in 4 cases. Lung diseases were found in 5 cases. Bilateral pulmonary metastasis was seen in 1 case. Pleural effusions were detected in 4 cases. Pericardial effusions were evident in 5 cases. Conclusion Most of the primary mediastinal seminomas are solid and large mass without calcification or fat. The tumors are usually located in the anterior mediastinum and areas of low density are usually seen in the center of tumors. Some tumors involve in adjacent structures. Seminoma has some features on CT.