Table 2.

Pathologic Distribution of the US Visible Masses

^* In benign masses, average equivalent diameter (diameter of sphere whose volume is equivalent to estimated volume of the mass) was 1.0 cm. Patients with benign masses had an average age of 49 years (range, 26–70 years).

^† In malignant masses, average equivalent diameter was 1.5 cm. Patients with benign masses had an average age of 56 years (range, 36–87 years).