While percussing the borders of the heart, the nurse picks up an area of dullness beginning at the 5th left intercostal space and moving upward to the 2nd left intercostal space at the sternal border. What do these findings indicate?

A. Benign variation. This finding is not typically considered a benign variation and warrants further evaluation. B. Cardiac atrophy. Cardiac atrophy would likely present differently and is not typically diagnosed via percussion findings alone. C. Expected finding. This finding is within normal limits for the size and location of the heart's borders on percussion. D. Cardiac enlargement. Cardiac enlargement might present with percussion dullness extending beyond normal limits, but the described findings do not indicate enlargement beyond expected borders.