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One observer was assigned to the task of determining specificity. This was accomplished by interspersing normal and fibrocystic cases between cancer cases. His accuracy was 90%, although most cases missed were errors of interpretation rather than failure of informational content in the film.
Cancer size varied from 3-mm area of microcalcifications to 6-cm neoplasms. Over 90% of cases were new; 10% had previous films for comparison.
Cukier DS. One-View Follow-up Mammogram-Reply. JAMA. 1977;238(16):1723. doi:10.1001/jama.1977.03280170017013