胸腺囊肿的CT、MRI诊断

目的:总结胸腺囊肿的CT和MRI影像表现。材料和方法:回顾分析12例胸腺囊肿的胸部平片、CT和MRI表现并与手术病理对照。结果:12例胸腺囊肿直径1~12cm,平均3.6cm;圆形或类圆形10例,长圆或圆柱形2例;位于前上纵隔9例,前下纵隔1例,从主动脉弓至横膈2例;边缘光整12例;境界清楚9例,与心脏大血管或心包联系紧密3例;未突出纵隔轮廓5例,突出纵隔轮廓7例;薄壁10例,厚壁2例;单房11例,多房1例;均匀水样密度9例,接近肌肉密度3例;7例增强扫描囊内容物均无增强。结论:大多数胸腺囊肿根据其CT和MRI表现,术前可作出正确诊断,并与其他纵隔囊性肿块相鉴别。

Diagnosis of Thymic Cysts on CT、 MRI

Purpose: To summarize the image findings of thymic cysts on CT and MRI. Materials and Methods: 12 thymic cysts were retrospectively reviewed comparing their chest plain films, CT and MRI with their surgery and pathology. Results: The diameters of the 12 thymic cysts ranged from 1 to 12cm, 3.6cm in average. 10 were round and 2 were cylindrical in shape. 9 located in anteriosuperior mediastinum, 1 located in anterior-inferior mediastinum and 2 located between the aorta arch and diaphragm. 12 had smooth borders. 9 were well-demarcated with the heart, great vessels or pericardium while 3 had a close relationship with them. 5 were within the mediastinum and 7 extended outside the mediastinum. 10 had thin walls and 2 had thick walls. 11 were single-cellular and 1 was multiple cellular. 9 were uniform water-like density and 3 were muscle-like density. 7 showed no enhancement after contrast administration. Conclusioin: Most of the thymic cysts could be diagnosed and differentiated when referring to their features on CT and MRI.