垂体瘤与甲状腺功能减退致垂体增生的MRI鉴别诊断

目的:研究垂体瘤与甲状腺功能减退(甲减)致垂体增生的MRI表现及鉴别诊断,为两者治疗前作出准确的诊断.方法:对术中已确诊垂体瘤46例及治疗后确诊甲减致垂体增生15例的MRI影像表现回顾性分析.结果:两者均可表现为垂体的增大,可呈球形甚至结节性.垂体瘤常侵袭附近组织结构,且因其血供差而易发生囊变、出血和坏死,MRI上呈混杂信号影；甲减所致垂体增生MRI表现为垂体前叶体积增大,信号均匀,呈等T1信号,其上缘呈对称性隆起,形态呈钟形,增强后扫描垂体明显均匀强化.结论:两者具有一定特征性的影像表现,通过MRI、治疗性诊断及实验室检查大部分病例可明确诊断.

The Differential Diagnose Value of MRI for Pituitary Tumor and Pituitary Hyperplasia Caused by Hypothyrosis

Objective:To investigate The differential diagnose value of MRI for pituitary tumor and pituitary hyperplasia caused by hypothyrosis.Methods:46 pituitary tumor patients and 15 pituitary hyperplasia caused by hypothyrosis were included in the study retrospectively.Results:all patients showed the pituitary globular or nodosity swelling.Pituitary tumor invaded the nearby tissue,and showed mix signal intensity owing to cyst,hemorrhage and necrosis.Pituitary hyperplasia caused by hypothyrosis showed adenohypophysis swelling as bell piece,and uniformity signal intensity and uniformity enhancement.Conclusion:Pituitary tumor and pituitary hyperplasia caused by hypothyrosis have certainly distinctive MRI feature and most patients need to be diagnosed by MRI plus laboratory examination and therapeutic diagnosis.