To evaluate the presence of effectiveness and the most accurate element of the diagnostic criteria of the Japan Society of Ultrasonics in medicine(JSUM. Nov, 1989) for distinguishing between benign and malignant solid breast masses on the US.
We analyzed the ultrasonic findings of histopathologically proved 51 fibroadenomas, 12 fibrocystic disease, and 39 breast cancers in relation to diagnostic criteria of the JSUM(shape, border, boundary, echo, internal echo, posterior echo, lateral
echo,
and depth/width ratio).
The number of cases in fibroadenoma, fibrocystic disease, and breast cancer corresponding to diagnostic criteria is in the shape(26/51, 5//12, 3/39), border(41/5, 9/12, 29/39), boundary echo(48/51, 12/12, 27/39), internal echo(43/51, 9/12.
24/39),
posterior echo(32/51, 3/12, 21/39), and lateral shadowing(15/51, 1/12, 35/39). All diagnostic criterias show statistical significance for differentiation of benign/malignant breast mass on the US(Chi-square test: p<0.05). The order of accuracy is
boundary echo, internal echo, and border. The mean of depth/width ratio is 0.54±0.15, 0.52±0.12, and 0.69±0.21 in fibroadenoma, fibrocystic disease, and breast cancer respectively and it has statistical significance for differentiation of
benign/malignant breast mass on the US(ANOVA test: p=0.0002).
The diagnostic criteria of JSUM is effective for differentiation of benign/malignant breast solid masses on the US and has accuracy in the order of boundary echo, internal echo, and border. Depth/width ratio also has statistical significance.
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