肝脏孤立性坏死结节的CT及MRI表现

目的:探讨肝脏孤立性坏死结节(SNN)的螺旋CT及高场强MRI表现,提高对SNN的诊断准确性。方法:回顾性分析30例(34个)经手术病理证实的SNN患者的影像学表现。其中10例行螺旋CT平扫和3期动态增强检查,20例行MRI平扫及增强检查。结果:CT发现11个病灶,MRI发现23个病灶。CT平扫示病灶均呈低或稍低密度,6例中央可见星芒状更低密度区,增强扫描动脉期病灶均无明显强化,延迟期4个病灶有边缘强化。MRT1WI示23个病灶均为低或稍低信号,10个病灶中心见点状、星状更低信号;T2WI示5个病灶呈稍低信号、18个为稍高信号;增强扫描动脉期所有病灶均未见明显强化,8个病灶门脉期及延迟期边缘强化。16个病灶中心更低密度/信号区均未见强化。结论:CT平扫和动态增强及MRI能较好地反映SNN的影像学特点,提高了对SNN的诊断准确性。.

CT and MRI Findings of Solitary Necrotic Nodule of Liver

Objective:To evaluate the CT and MRI findings of solitary necrotic nodule (SNN) of liver,in order to improve the accuracy of diagnosis.Methods:The imaging findings of 30 patients with 34 SNNs proved by surgery and pathology were analyzed retrospectively.Spiral CT was performed in 10 patients,MRI was performed in 20 patients.Results:11 SNNs were detected by CT,whereas 23 SNNs were detected by MRI.Hypo-or slightly hypo-attenuated lesions were showed on pre-contrast CT,central star-shape more hypo-attenuated area was showed in 6 lesions.No obvious enhancement was assessed on post-contrast CT images,4 lesions had peripheral enhancement on delayed phase.Of the 23 lesions detected by MRI,hypo-/slightly hypo-intense lesions were assessed on T1WI,central dotted or stellate more hypo-intense area was assessed in 10 lesions.On T2WI,5 slightly hypo-intense lesions and 18 hyper-intense lesions were seen.No obvious enhancement was revealed in arterial phase after contrast administration,peripheral enhancement could be assessed in 8 lesions on portal vein phase and delayed phase.No enhancement was assessed in the hypo-attenuated /hypo-intense region within the lesion center.Conclusion:The imaging characteristics of SNN could be assessed on pre-and post-contrast dynamic enhanced CT and MRI,which is helpful to improve the accuracy of diagnosis.