Non-alcoholic fatty liver disease CT: Difference between revisions
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'''Editor in Chief''': Elliot Tapper, M.D., Beth Israel Deaconess Medical Center, [[User:C Michael Gibson |C. Michael Gibson, M.S., M.D.]] [mailto:charlesmichaelgibson@gmail.com] | '''Editor in Chief''': Elliot Tapper, M.D., Beth Israel Deaconess Medical Center, [[User:C Michael Gibson |C. Michael Gibson, M.S., M.D.]] [mailto:charlesmichaelgibson@gmail.com] | ||
==Overview== | ==Overview== | ||
Imaging is often ordered in the workup of suspected NAFLD. Ultrasound and computed tomography have sensitivities between 93-100%, but 62-76% positive predictive values. Problematically, ultrasound of fatty liver reveals a hyperechoic echotexture - a so-called 'bright liver' - that can often be indistinguishable from fibrosis and generally cannot reliably delineate NAFLD from NASH.<ref>MIshra P et al. Abdominal Ultrasound for Diagnosis of Nonalcoholic Fatty Liver Disease (NAFLD). Am J Gastroenterol 2007;102:2716–2717).</ref> Computed tomography is less sensitive, rarely detecting steatosis when fatty infiltration is less than 33%, but is potentially more specific.<ref>Saadeh et al. The Utility of Radiological Imaging in Nonalcoholic Fatty Liver Disease. GASTROENTEROLOGY 2002;123:745–750</ref> Statistics are similar for MRI, however using advanced MR techniques, some groups have been able to both quantify steatosis and differentiate steatohepatitis from steatosis.<ref>Taouli B et al. Advanced MRI Methods for Assessment of Chronic Liver Disease. AJR 2009; 193:14–27.</ref><ref>McPherson S et al. Magnetic resonance imaging and spectroscopy accurately estimate the severity of steatosis provided the stage of fibrosis is considered. J Hepatol. 2009;51(2):389-97</ref> | |||
==References== | ==References== | ||
Revision as of 19:17, 17 November 2012
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Editor in Chief: Elliot Tapper, M.D., Beth Israel Deaconess Medical Center, C. Michael Gibson, M.S., M.D. [1]
Overview
Imaging is often ordered in the workup of suspected NAFLD. Ultrasound and computed tomography have sensitivities between 93-100%, but 62-76% positive predictive values. Problematically, ultrasound of fatty liver reveals a hyperechoic echotexture - a so-called 'bright liver' - that can often be indistinguishable from fibrosis and generally cannot reliably delineate NAFLD from NASH.[1] Computed tomography is less sensitive, rarely detecting steatosis when fatty infiltration is less than 33%, but is potentially more specific.[2] Statistics are similar for MRI, however using advanced MR techniques, some groups have been able to both quantify steatosis and differentiate steatohepatitis from steatosis.[3][4]
References
- ↑ MIshra P et al. Abdominal Ultrasound for Diagnosis of Nonalcoholic Fatty Liver Disease (NAFLD). Am J Gastroenterol 2007;102:2716–2717).
- ↑ Saadeh et al. The Utility of Radiological Imaging in Nonalcoholic Fatty Liver Disease. GASTROENTEROLOGY 2002;123:745–750
- ↑ Taouli B et al. Advanced MRI Methods for Assessment of Chronic Liver Disease. AJR 2009; 193:14–27.
- ↑ McPherson S et al. Magnetic resonance imaging and spectroscopy accurately estimate the severity of steatosis provided the stage of fibrosis is considered. J Hepatol. 2009;51(2):389-97