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目的探讨MRI长时间延迟增强扫描在肝孤立性坏死结节(SNNL)诊断及鉴别中的作用。方法 16例SNNL患者行常规平扫、三期增强CT和多期长延迟增强MRI扫描。对照组中23例肝内恶性肿瘤患者也进行长延迟MRI扫描。分析病灶影像学表现,以探讨两类疾病的差别。结果随着MRI延迟时间的增加,肿瘤边缘强化程度逐渐增加。当延迟时间为1 h时,所有病灶均表现为中度至重度环形强化、中心无强化。对照组中所有病灶边缘强化均在1 h延迟期时退出。结论 1 h的长延迟增强MRI对SNNL的诊断及其与常见相似疾病的鉴别诊断具有重要意义,SNNL的特征性影像学表现为在长延迟MRI上呈明显环形强化伴中心无强化区。
Objective To investigate the role of long-term MRI enhanced MRI in the diagnosis and differentiation of hepatic solitary necrotic nodules (SNNL). Methods Sixteen patients with SNNL underwent routine scan, three-phase enhanced CT and multi-phase long-delay enhanced MRI. Twenty-three patients with intrahepatic malignancy in the control group also underwent long-delayed MRI scans. Analysis of lesion imaging findings to explore the differences between the two types of diseases. Results With the increase of MRI delay time, the degree of tumor edge enhancement gradually increased. When the delay time was 1 h, all lesions showed moderate to severe annular enhancement without central enhancement. All lesions in the control group edge enhancement were withdrawn at 1 h delay. Conclusions Long-delay-enhanced MRI at 1 h has an important role in the diagnosis of SNNL and its differential diagnosis with common similar diseases. The characteristic imaging findings of SNNL are obvious annular enhancement with no enhancement in long-term MRI.