A computerized report-coding system for diagnostic mammography using a personal computer was developed. Four years' experience with the radiologist-oriented system is presented. The data input time for report generation is in most cases less than 30 seconds by radiologists familiar with keyboard entry. Suspicious and malignant findings are dictated in the conventional way. About 80% of the mammographic examinations at the university Breast Imaging Center were suitable for standardized reporting. Radiologist-generated reports using a personal computer might be an alternative to transcriptionist-oriented systems.