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Classification of parenchymal echogenicity according to Hricak et al. [10]
| Grade 0: echogenicity poorer than that of the liver parenchyma (normal finding) |
| Grade I: echogenicity identical to that of the liver parenchyma (normal finding) |
| Grade II: echogenicity more intense than that of the liver parenchyma (pathological finding) |
| Grade III: echogenicity identical to that of the renal sinus (pathological finding) |
