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目的：探讨垂体内低信号灶，垂体高度，上缘形状，鞍底骨质凹陷和垂体柄移位对垂体微腺瘤的ＭＲＩ诊断价值；比较ＭＲＩ和ＣＴ在显示上述征像上的能力。材料和方法：对５０例正常对照组垂体腺和４１例病理证实的垂体微腺瘤术前ＭＲＩ进行对比观察，并对其中２０例微腺瘤进行ＭＲＩ和ＣＴ特征对照研究。结果：对照组与腺瘤组相比垂体腺增高，上缘凸起，内有低信号灶的发生率有显著差异（ｐ＜０．０１），鞍底凹陷侵独发生率也有显著差别（ｐ＜０．０５），垂体柄向腺瘤对侧移位发生率无显著差别（ｐ＜０．１）。在判断垂体微腺瘤的位置及大小（５．１±２．０／５．２±１．９ｍｍ）、鞍隔上抬（１６／１５）、垂体柄偏位（１０／９）以及垂体增大（１７／１６）上，ＭＲＩ稍优于ＣＴ（ｐ＞０．２５）。明确鞍底骨质侵蚀ＣＴ明显优于ＭＲＩ（ｐ＜０．０５）。结论：增大垂体腺内出现低信号灶，伴上缘凸起和鞍底凹陷侵蚀为ＭＲＩ诊断微腺瘤最可靠征像；ＭＲＩ在显示上述征像（鞍底骨质侵蚀除外）上优于ＣＴ。
PURPOSE: To investigate the value of low signal lesions in pituitary gland, the value of pituitary height, shape of upper edge, the sellar bone depression and pituitary stalk displacement in the diagnosis of pituitary adenoma and the ability of MRI and CT in displaying the above signs. Materials and Methods: The preoperative MRI of 50 cases of pituitary gland and 41 cases of pathologically confirmed pituitary adenoma were compared, MRI and CT features of 20 cases were examined. Results: The incidence of pituitary gland hyperplasia in the control group was significantly higher than that in the adenoma group (p <0.01). There was also significant difference in the incidence of invasion of the soleus <0.05). There was no significant difference in the incidence of pituitary stalk transposition to adenoma (p <0.1). In determining the location and size of pituitary adenoma (5.1 ± 2.0 / 5.2 ± 1.9mm), suprasellar lift (16/15), deviation of the pituitary stalk (10/9) and pituitary augmentation Large (17/16), MRI slightly better than CT (p> 0.25). A clear CT scan of the sellar bone was significantly better than MRI (p <0.05). CONCLUSION: Increasing the presence of low signal spots in the pituitary gland with the erosion of the upper margin and the sagittal depression is the most reliable sign for the diagnosis of microadenomas by MRI. MRI is superior to those for displaying the above signs (except for sequelae) CT.