摘要:目的:评价MRI半剂量动态增强诊断垂体微腺瘤的价值。方法:搜集38例经随访证实的垂体微腺瘤病例,均采取磁共振平扫,再行半剂量钆喷酸葡胺(Gd—DTPA)动态增强扫描及延迟的常规增强扫描。结果:38例垂体微腺瘤中,病灶大小〈5mm23例,5~10mm15例。平扫T1WI可见低信号影20例,无明显异常信号18例,而半剂量动态增强扫描均发现病灶32例,表现为动态早期稍低信号影。结论:MRI半剂量动态增强扫描能够明显提高垂体微腺瘤的检出率,尤其是动态增强早期扫描最为敏感。
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