Chandarana Hersh, Taouli Bachir
Department of Radiology, NYU Langone Medical Center, 550 First Avenue, New York, NY 10016, USA.
Magn Reson Imaging Clin N Am. 2010 Aug;18(3):451-64, x. doi: 10.1016/j.mric.2010.07.001.
Liver metastases are the most frequently encountered malignant liver lesions in the Western countries. Accurate diagnosis of liver metastases is essential for appropriate management of these patients. Multiple imaging modalities, including ultrasound, CT, positron emission tomography, and MRI, are available for the evaluation of patients with suspected or known liver metastases. Contrast-enhanced MRI has a high accuracy for detection and characterization of liver lesions. Additionally, diffusion-weighted MRI (DWI) has been gaining increasing attention. It is a noncontrast technique that is easy to perform, could be incorporated in routine clinical protocols, and has the potential to provide tissue characterization. This article discusses the basic principles of DWI and discusses its emerging role in the detection of liver metastases in patients with extrahepatic malignancies.
肝转移瘤是西方国家最常见的肝脏恶性病变。准确诊断肝转移瘤对于这些患者的恰当治疗至关重要。多种成像方式，包括超声、CT、正电子发射断层扫描和MRI，可用于评估疑似或已知肝转移瘤的患者。对比增强MRI对肝脏病变的检测和特征描述具有很高的准确性。此外，扩散加权MRI（DWI）越来越受到关注。它是一种无需造影剂的技术，操作简便，可纳入常规临床方案，并且有提供组织特征描述的潜力。本文讨论了DWI的基本原理，并探讨了其在肝外恶性肿瘤患者肝转移瘤检测中的新作用。
