Renal Angiomyolipoma Based on New Classification: How to Differentiate It From Renal Cell Carcinoma.
AJR Am J Roentgenol. 2019 Mar;212(3):582-588. doi: 10.2214/AJR.18.20408. Epub 2019 Jan 8.
OBJECTIVE: The purpose of this article is to describe useful imaging features for differentiating angiomyolipoma (AML) subtypes from renal cell carcinoma subtypes.
CONCLUSION: A newer radiologic classification of renal AML consists of fat-rich AML (≤ -10 HU), fat-poor AML (> -10 HU; tumor-to-spleen ratio < 0.71; signal intensity index, > 16.5%), and fat-invisible AML (> -10 HU; tumor-to-spleen ratio, > 0.71; signal intensity index, < 16.5%). Each subtype must be differentiated from the renal cell carcinoma subtype because of overlapping imaging features.