垂体微腺瘤不同增强方式MRI的诊断价值

目的 :探讨注射对比剂后不同增强方式对垂体微腺瘤的诊断价值。方法 :对 5 6例垂体微腺瘤患者先行矢状面及冠状面T1WI和T2 WI扫描 ,然后行GD DTPA冠状面T1WI动态增强扫描和常规延迟增强扫描 ,3 0min后再行冠状面T1WI延迟增强扫描。结果 :5 6例微腺瘤中平扫显示 13例 ,动态增强显示 5 5例 ,常规延迟增强显示 48例 ,延迟增强显示 3 3例。其中动态增强清楚显示 47例 ,常规延迟增强清楚显示 2 6例 ,延迟增强清楚显示 14例 ,三者检出率比较 ,差异有统计学意义。结论 :动态增强扫描与常规延迟增强可明显提高垂体微腺瘤的检出率 ,具有较高诊断价值 ,延迟增强扫描检出率较低 ,不适宜常规应用。

Value of Different Ways of MR Contrast Enhancement in the Diagnosis of Pituitary Microadenoma

Objective:To evaluate effectiveness of different enhancement ways of MR contrast enhancement in the diagnosis of pituitary microadenomas.Methods:56 patients with pituitary microadenoma were studied by means of GD-DTPA enhanced dynamic MRI and conventional spin echo sequences before and after dynamic scanning,and delayed enhanced MRI thirty minutes later.Results:Among 56 microadenomas,dynamic sequence detected obviously 47 cases,delayed conventional contrast enhancement detected obviously 26 cases,delayed scan detected obviously 14 cases.Dynamic scan was superior to delayed conventional contrast enhancement and delayed enhancement (P<0.005).Conclusion:Dynamic and delayed conventional contrast enhancement obviously improved lesion detection over delayed enhanced MRI,Delayed enhanced MRI is of no value in detection of pituitary microadenoma and unfit for routine use.