Renal mass. No fat. CT or MRI without and with contrast. Solid. <1 cm.

For how long has the mass demonstrated no growth or morphologic change?

Newly discovered or less than 5 years.

5 years or more.

NOT stable. There is growth or morphologic change.

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Notes:
Growth of a mass is defined as increase in size for 4 mm or more per year on average.

Morphologic change is any change in heterogeneity, such as a change in contour, attenuation, or number of septa.