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Fig. 2 —Drawings show typical diagrammatic appearance of five
patterns of lymph nodes. Elastographic patterns were determined on
distribution and percentage of lymph node area having high elasticity (hard):
pattern 1, absent or small hard area; pattern 2, hard area < 45% of lymph
node; pattern 3, hard area 
45%; pattern 4, peripheral hard and central
soft areas; pattern 5, hard area occupying entire lymph node. Increasing
tissue hardness appears in ascending order as red, yellow, green, and
blue.
