1. Nonalcoholic fatty liver disease and nonalcoholic steatohepatitis: new trends and role of ultrasonography
- Author
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Hiroko Iijima, Toshifumi Tada, Takashi Nishimura, and Masahiro Yoshida
- Subjects
Male ,medicine.medical_specialty ,digestive system ,Gastroenterology ,030218 nuclear medicine & medical imaging ,03 medical and health sciences ,0302 clinical medicine ,Fibrosis ,Non-alcoholic Fatty Liver Disease ,Internal medicine ,Nonalcoholic fatty liver disease ,medicine ,Humans ,Radiology, Nuclear Medicine and imaging ,Ultrasonography ,medicine.diagnostic_test ,business.industry ,Fatty liver ,nutritional and metabolic diseases ,Magnetic resonance imaging ,General Medicine ,medicine.disease ,digestive system diseases ,Liver ,Liver biopsy ,030211 gastroenterology & hepatology ,Elastography ,Steatosis ,Transient elastography ,business - Abstract
Nonalcoholic fatty liver disease (NAFLD) is entering a new era in terms of diagnosis and conceptualization. The term NAFLD is considered to not reflect current knowledge. Metabolic dysfunction-associated fatty liver disease (MAFLD) has been suggested as a more appropriate overarching term by experts in this field. Regarding NAFLD progression, most patients die from non-liver-related diseases, even patients with advanced fibrosis. Liver biopsy is essential for the diagnosis of nonalcoholic steatohepatitis (NASH); it is the only procedure that reliably differentiates NAFLD from NASH. Recently, various noninvasive methods for diagnosing steatosis and fibrosis have been developed. Ultrasound attenuation measurements and proton density fat fraction with magnetic resonance imaging (MRI) have been developed as imaging tools for predicting steatosis. Fibrosis-4 index and NAFLD fibrosis score are complex scores for predicting fibrosis in patients with NAFLD. In addition, elastography based on ultrasound and MRI has been developed as an imaging tool for predicting fibrosis. There is a strong correlation between values from various real-time shear wave elastography devices and transient elastography, which is the gold standard for ultrasound-based measurements of liver stiffness. In conclusion, NAFLD is at a turning point in terms of its conceptualization, terminology, and diagnostics. It is now time to reconfirm the role of ultrasonography for the assessment of NAFLD.
- Published
- 2022
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