侵袭性垂体瘤的MRI表现

【目的】通过分析侵袭性垂体瘤（invasive pituitary adenoma，IPA）的MRI表现，以探讨该肿瘤的生长方式、形态及信号特征。【方法】回顾分析经手术及病理证实的33例IPA的MRI表现。33例患者均行MRI平扫及增强检查，其中男15例，女18例，年龄17-67岁，平均46．7岁。【结果】IPA通常体积较大，易向鞍外多个方向侵犯，其中以颅底骨质和海绵窦侵犯为特征。IPA的MRI信号混杂，其中囊变坏死和出血常见。【结论】MRI可清楚反映该肿瘤的侵袭特征，是术前评价垂体瘤侵袭性的重要方法。

MRI appearance of invasive pituitary adenoma

Objective] To evaluate the MRI apperance and signal characterstics, biological growing way and shape of the invasive pituitary adenoma （IPA）. Methods] 33 patients consisted of 15 man and 18 women with mean age of 46.7 years （ranging17 - 67） were included in our study. The review analysis was expressed by the MRI of 33 IPAs with surgical operation and the pathological confirmation. Results] The physical volume of IPA was usually large, and was easy to saddle outside to several direction, among them the basicranial and sinus were characteristic ally. al]x The MRI signal character of IPA was uneven, among them, cystic necrosis and bleeding were common. Conclusions] MRI can easily reflect the feature of invasive pituitary adenoma （IPA）, and MRI may be the most important method to evaluates the IPA before operation.