Department of Diggnostic Radiology, College of Medicine, Yeungnam University Department of Pathology, College of Medicine, Yeungnam University1
ABSTRACT
PURPOSE : To evaluate the frequency of posterior sonic attenuation and enhancement in invasive ductalcarcinoma of breast on ultrasound, and to compare with histo-pathologic findings. MATERIAL & METHODS : Sonographicfindings of 26 histologically proven invasive ductal carcinomas were retrospectively reviewed in point ofposterior echo pattern regardless other ultrasonic features. They were classified in two groups according toposterior echo pattern such as enhancement or shadowing, and compared with various internal histologiccharacteristics such as amount of connective tissue, degree of elastosis, necrosis, gross circumscription,harboring inflammation, histologic ifferentiation, nuclear pleomorphism, and mitotic index. RESULTS : The acousticshadowing was seen in 34.6%, whereas posterior sonic enhancement was seen in 65.4% of cases. The acousticshadowing group had more connective tissue, elastosis, and poor demarcated margin than the sonic enhancement group(p < 0.05). But no significant differences were seen in other histopathologic findings representing malignancybetween two groups. CONCLUSION : A close relationship between posterior echo pattern and amount of connectivetissue or elastosis is found in invasive ductal carcinoma of breast. The acoustic shadowing known as acharacteristic ultrasonographic finding of malignant breast mass does not represent the degree of malignancy.
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