isoenhancement

This age correction was calculated by linearly interpolating the offsets perpendicular to isoenhancement lines between models with ages of 3, 8, and 15 Gyr.

...definitely malignant on the basis of the enhancement pattern during the arterial phase and enhancement degree during the portal and late phases compared with the liver (hypoenhancement indicating malignant and isoenhancement to hyperenhancement indicating benign).