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Abstract：
The liver is one of the organs most commonly involved in metastatic disease, especially due to its unique vascularization. It\'s well known that liver metastases represent the most common hepatic malignant tumors. From a practical point of view, it\'s of utmost importance to evaluate the presence of liver metastases when staging oncologic patients, to select the best treatment possible, and finally to predict the overall prognosis. In the past few years, imaging techniques have gained a central role in identifying liver metastases, thanks to ultrasonography, contrast-enhanced computed tomography (CT), and magnetic resonance imaging (MRI). All these techniques, especially CT and MRI, can be considered the non-invasive reference standard techniques for the assessment of liver involvement by metastases. On the other hand, the liver can be affected by different focal lesions, sometimes benign, and sometimes malignant. On these bases, radiologists should face the differential diagnosis between benign and secondary lesions to correctly allocate patients to the best management. Considering the above-mentioned principles, it\'s extremely important to underline and refresh the broad spectrum of liver metastases features that can occur in everyday clinical practice. This review aims to summarize the most common imaging features of liver metastases, with a special focus on typical and atypical appearance, by using MRI.
摘要：
肝脏是转移性疾病最常见的器官之一，特别是由于其独特的血管形成。众所周知，肝转移是最常见的肝脏恶性肿瘤。从实践的角度来看,对肿瘤患者进行分期时，评估肝转移的存在至关重要，选择可能的最佳治疗方法，最后预测总体预后。在过去的几年里,成像技术在识别肝转移中发挥了核心作用，多亏了超声检查,对比增强计算机断层扫描（CT），磁共振成像（MRI）。所有这些技术，尤其是CT和MRI,可被认为是评估肝脏转移受累的非侵入性参考标准技术。另一方面,肝脏可能会受到不同局灶性病变的影响，有时是良性的，有时是恶性的。在这些基础上,放射科医师应面对良性和继发性病变的鉴别诊断，以正确地将患者分配到最佳管理。考虑到上述原则，强调和更新日常临床实践中可能发生的广泛的肝转移特征非常重要。本文旨在总结肝转移瘤最常见的影像学特征。特别关注典型和非典型的外观，使用MRI。
