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| 1 | Radiologic evaluation of nonalcoholic fatty liver disease显示文摘Nonalcoholic fatty liver disease(NAFLD)is a frequent cause of chronic liver diseases,ranging from simple steatosis to nonalcoholic steatohepatitis(NASH)-related liver cirrhosis.Although liver biopsy is still the gold standard for the diagnosis of NAFLD,especially for the diagnosis of NASH,imaging methods have been increasingly accepted as noninvasive alternatives to liver biopsy.Ultrasonography is a well-established and costeffective imaging technique for the diagnosis of hepatic steatosis,especially for screening a large population at risk of NAFLD.Ultrasonography has a reasonable accuracy in detecting moderate-to-severe hepatic steatosis although it is less accurate for detecting mild hepatic steatosis,operator-dependent,and rather qualitative.Computed tomography is not appropriate for general population assessment of hepatic steatosis given its inaccuracy in detecting mild hepatic steatosis and potential radiation hazard.However,computed tomography may be effective in specific clinical situations,such as evaluation of donor candidates for hepatic transplantation.Magnetic resonance spectroscopy and magnetic resonance imaging are now regarded as the most accurate practical methods of measuring liver fat in clinical practice,especially for longitudinal followup of patients with NAFLD.Ultrasound elastography and magnetic resonance elastography are increasingly used to evaluate the degree of liver fibrosis in patients with NAFLD and to differentiate NASH from simple steatosis.This article will review current imaging methods used to evaluate hepatic steatosis,including the diagnostic accuracy,limitations,and practical applicability of each method.It will also briefly describe the potential role of elastography techniques in the evaluation of patients with NAFLD. | Seung Soo Lee Seong Ho Park | 2014 | World Journal of Gastroenterology2014，20，23： | 41 |
| 2 | Bedside ultrasound in the diagnosis of nonalcoholic fatty liver disease显示文摘Non-alcoholic fatty liver disease(NAFLD)is the most common liver disease in the United States.While the American Association for the Study of Liver Diseases guidelines define NAFLD as hepatic steatosis detected either on histology or imaging without a secondary cause of abnormal hepatic fat accumulation,no imaging modality is recommended as standard of care for screening or diagnosis.Bedside ultrasound has been evaluated as a non-invasive method of diagnosing NAFLD with the presence of characteristic sonographic findings.Prior studies suggest characteristic sonographic findings for NAFLD include bright hepatic echoes,increased hepatorenal echogenicity,vascular blurring of portal or hepatic vein and subcutaneous tissue thickness.These sonographic characteristics have not been shown to aid bedside clinicians easily identify potential cases of NAFLD.While sonographic findings such as attenuation of image,diffuse echogenicity,uniform heterogeneous liver,thick subcutaneous depth,and enlarged liver filling of the entire field could be identifiedby clinicians from bedside ultrasound.The accessibility,ease of use,and low-side effect profile of ultrasound make bedside ultrasound an appealing imaging modality in the detection of hepatic steatosis.When used with appropriate clinical risk factors and steatosis involves greater than 33%of the liver,ultrasound can reliably diagnose NAFLD.Despite the ability of ultrasound in detecting moderate hepatic steatosis,it cannot replace liver biopsy in staging the degree of fibrosis.The purpose of this review is to examine the diagnostic accuracy,utility,and limitations of ultrasound in the diagnosis of NAFLD and its potential use by clinicians in routine practices. | Nancy Khov Amol Sharma Thomas R Riley | 2014 | World Journal of Gastroenterology2014，20，22： | 11 |
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