目的探讨垂体微腺瘤磁共振成像 (MRI)的影像学特点。方法分析 12例经手术证实的垂体微腺瘤磁共振(MR)信号的变化。结果 12例MRI平扫及动态增强扫描均显示为低信号 ,3例垂体形态及高度异常 ,2例累及一侧海绵窦 ,5例垂体柄偏移。结论MR平扫结合动态增强是诊断垂体微腺瘤最理想的影像学手段。 Objective To investigate the imaging features of magnetic resonance imaging (MRI) of pituitary microadenoma. Methods The changes of magnetic resonance (MR) signals in 12 cases of pituitary microadenomas confirmed by surgery were analyzed. Results All 12 cases showed low signal by plain scan and dynamic contrast-enhanced MRI. Three cases had abnormal pituitary morphology and height. Two cases involved cavernous sinus and five cases had pituitary stalk offset. Conclusions MR imaging combined with dynamic enhancement of pituitary adenoma diagnosis is the best imaging means.