垂体微腺瘤的MR诊断

MR Diagnosis in Pituitary Microadenomas

目的 总结垂体微腺瘤不同的生长方式 ,提出垂体微腺瘤的MR诊断依据。方法 回顾分析了 93例垂体微腺瘤MR平扫、动态增强和动态后T1WI的资料 ,对垂体微腺瘤的生长方式和特征进行归纳和分析。结果 依据其生长方式将垂体微腺瘤分为 3型 :偏心型 5 5例 ( 5 9% ) ,中心型 2 5例 ( 2 7% ) ,鞍底型 13例 ( 14 % )。诊断依据 :( 1)垂体内部局限性低信号 ;( 2 )垂体两侧不对称大于 1.4mm ;( 3 )垂体中间向上膨隆大于 2 .3mm ;( 4 )垂体高径大于 8mm。结论 利用垂体微腺瘤的分型 ,掌握其生长特点 ,全面考虑临床表现和垂体内分泌的生化检查。在检查方法上 ,要动态增强扫描和常规增强扫描相结合。

Objective To conclude the different growing patterns and explode the MR diagnostic basis of pituitary microadenomas.Methods To review and analyze unenhanced,dynamic keyhole fast spin-echo and conventional contrast enhanced MR imaging in 93 cases of pituitary microadenomas and to induce the growing patterns and specialities of the pituitary microadenomas.Results According to the different growing patterns, Pituitary adenomas were divided into 3 types, in which 55 (59%) cases were eccentric type,25(27%)cases were centric type and 13(14%)cases were sellar floor type.Diagnostic basis(1)local low signal in the pituitary gland;(2)more than 1.4mm in the difference of pituitary height between the right and left side;(3)more than 2.3mm of central protrusion of pituitary gland;(4)more than 8mm in the height of pituitary gland.Conclusion Based on the 3 types of pituitary micro adenomas,we make clear about its growing specialities and completely consider the clinical symptom and endocrine biochemical test. In the MR examination methods, we should combine the unenhanced and dynamic enhanced scanning.