We analyzed the histograms of reflecting ultrasound (US) from the internal
areas of the masses of 50 lesions in the breast. The central average of gra
vity and the ratio between lower and higher width in the histograms were co
mpared as the parameters. Statistical significance were found in both param
eters between malignant tumors and benign masses (P < .001, P < .01). There
fore, analysis of histograms based on reflecting US was useful in making di
fferential diagnoses of malignant rumors and benign masses in the breast. (
C) 2001 Elsevier Science Inc. All rights reserved.