Abstract
Six hundred mammograms from 307 consecutive symptomatic patients with a firm retrospective diagnosis were evaluated blindly and independently by two observers. Each observer identified 43 of 47 tumors (91 per cent) with predictive values of 0.63 and 0.68, respectively, for the positive statement, and 0.98 for the negative statement. The overall interobserver agreement with respect to malignancy was 94 per cent (Kappa 0.84) and concerning the diagnosis of simple cysts 91 per cent (Kappa 0.60). The frequency of subclinical cancer demonstrated by mammography in this material was higher than the prevalence of mammary carcinoma found by screening of risk group populations. Thus, mammography remains an objective and reproducible diagnostic method with distinct complementary value to clinical examination. By utilizing certain mammographic criteria for benign lesions it may be possible to reduce the number of biopsies presently performed on the basis of unspecific palpatory findings.
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