Adrenal Nodule Signal Intensity
Adrenal SI Index
%
Adrenal/Spleen Ratio
%
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A nodule with SI Index >16.5% (1.5T) or >1.7% (3T) is most likely but not definitely an adenoma.
A nodule with Adrenal/Spleen Ratio ≤-35.9% (1.5T) or ≤-17.2% (3T) is most likely but not definitely an adenoma.