垂体微腺瘤的高场强MRI诊断

High strength MRI Diagnosis of Pituitary Microadenoma

目的：评价高场强ＭＲＩ诊断垂体微腺瘤的特异性和敏感性。材料与方法：１９９３年５月至１９９３年１２月间，笔者对行ＭＲ检查的５０例垂体微腺瘤进行了分析。其中男８例，女４２例。９例微腺瘤直径小于或等于３ｍｍ，最小者２ｍｍ。所有病例均应用西门子１．５ＴＭａｇｎｅｔｏｍ６３ｓｐＭＲ检查，层厚３ｍｍ。结果：垂体内局限性低信号（９２％）是微腺瘤的特征性表现，各间接征象具有不同的诊断价值；特别指出，各种类型的微腺瘤具有其特定的发生部位；平扫冠状位Ｔ１加权像为诊断垂体微腺瘤的首选序列，强化扫描不必要作常规应用。结论：高场强ＭＲＩ对诊断垂体微腺瘤具有独到的优越性。

Objective:To evaluate the speciality and sensitivety of the high strengh MRI in diagnosing microadenoma.Materials and methods:From May 1993 to December 1993,the auther had analyzed 50 pituitary microadenomas which had been checked by MR.The diametres of 9 cases were smaller or equal to 3mm.Of which,the smallest was 2mm.All patients were performed on a 1.5T Siemens Magnetom 63SP MR,with a slice thickness of 3mm.Results:The focal hypointensity(92%) within pituitary was the characterastic sign of microadenoma,and the diagnosing values of indirect signs varied;Especially,each kind of micro adenoma had its certain site in pituitary;Non contrast Coronal T1-W1 SE sequence was the first choice in diagnosing this kind of tumor.Enhancement examination can't be used as routine.Conclusion:The high strength MRI has extremely superiority in diagnosing microadenomas.