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目的 探讨MRI动态增强扫描在垂体微腺瘤中的应用价值。方法 回顾性分析经手术及病理证实的 18例垂体微腺瘤的MRI表现 ,其中 6例先行CT扫描。结果 18例垂体微腺瘤中有 12例肿瘤位于垂体的一侧 ,垂体柄向对侧偏移 ,病变处鞍底有不程度的向下凹陷 ,3例肿瘤位于垂体中间 ,2例肿瘤位于垂体内呈散在沙粒状 ,1例肿瘤位于垂体之下 ,即垂体与鞍底之间。MRI平扫时 18例患者中 12例病变在T1WI上为低信号 ,在T2 WI上为稍高信号 ;6例病变在T1WI上为等信号 ,在T2 WI上为等信号 ,局部略有隆起 ,鞍底有不同程度凹陷 ;所有病变行MRI动态增强后 ,肿瘤区信号明显低于正常垂体强化信号 ,形成显著的差别 ,随着时间延长 ,肿瘤也逐渐强化。结论 MRI动态增强扫描是垂体微腺瘤首选的影像学检查方法 ,操作简单、无创伤、无痛苦。
Objective To investigate the value of dynamic contrast-enhanced MRI in pituitary adenoma. Methods The MRI findings of 18 cases of pituitary microadenomas confirmed by operation and pathology were retrospectively analyzed. Among them, 6 cases had CT scan first. Results In 18 cases of pituitary microadenomas, 12 tumors were located on the side of the pituitary, the pituitary stalk shifted to the opposite side, the lesion was not depressed to the bottom of the saddle, 3 tumors were located in the middle of the pituitary, 2 tumors were located in the pituitary Sand was scattered in the shape of a tumor located in the pituitary, that is, between the pituitary and the saddle. Twelve lesions were low signal on T1WI and slightly higher signal on T2WI in 18 patients under plain MRI scan. Six lesions were equal signal on T1WI, equal signal on T2WI, slight local uplift, Sagittal with different degrees of depression; all lesions underwent dynamic MRI enhancement, tumor signal was significantly lower than the normal pituitary signal, forming a significant difference, with the passage of time, the tumor also gradually strengthened. Conclusion MRI dynamic contrast-enhanced MRI is the preferred imaging method for pituitary adenoma, which is simple, noninvasive and painless.