短暂性肝密度异常CT及MR表现

CT and MRI study of transient hepatic attenuation difference

目的分析短暂性肝密度异常(THAD)CT 及 MR 表现,揭示 THAD 产生的原因,避免假阳性诊断和误诊。方法回顾10例 CT 出现 THAD 的患者资料,5例 MRI 出现 THAD 的患者资料,均行平扫及动态增强。结果 7例 CT 出现一过性高灌注,4例 MRI 出现一过性高灌注;3例 CT 出现一过性低灌注,1例MRI 出现一过性低灌注。结论 CT 及 MRI 出现 THAD 与 CT 及 MRI 较快速扫描有关,只有充分了解肝脏正常生理和病理情况下的血液供应特点,才能对可能出现的肝脏局部灌注异常作出正确的判断,结合平扫可以明确诊断。

Objective To study CT and MRI appearance of transient hepatic attenuation difference （THAI）） .to reveal the cause of THAD,and to avoid false positive and misdiagnosis. Methods 10 eases appearing THAD in CT and 5 cases appearing THAD in MRI were reviewed and all were processed with plain scan and dynamic contrast with CT or MRI. Results 7 eases appeared transiem hypertransfusion of CT,4 eases appeared transiem hypertransfusion of MRI;3 cases appeared transient Hypoperfusion of CT,1 ease appeared transient hypoperfusion of MRI. Conclusion The appearance of THAD in CT and MRI,was related to the quick-scan with CT and MRI only sufficient comprehension of the characteristics of blood supply in normal physiology and pathology of liver, combined with plain scan,could make correct decision possible in the final diagnosis when it occurred regional perfusion difference in liver.