Abstract
Abstract Present status of differential diagnosis of breast cancer by ultrasound was reviewed in the light of historical development of the field, including the evaluation of the types of equipment together with the consequent clinical improvement in diagnostic accuracy rate. Differential diagnostic criteria proposed by various investigators for breast cancer were summarized and diagnostic accuracy rates for differential diagnosis of breast tumors reported by various investigators recently were tabulated and the overall accuracy rates obtained were an average of 87 and 80 per cent for malignant lesions and benign lesions respectively. The rates were 97, 78 and 87 per cent for scirrhous carcinoma, papillary carcinoma and medullary carcinoma respectively, and 81, 93 and 100 per cent for T1, T2 and T3 in TNM classification respectively.
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