Objective: To evaluate mammographic breast density in asymptomatic menopausal women in correlation with clinical and sonographic findings. Materials and Methods: Mammograms and clinical and sonographic findings of 238 asymptomatic patients were retrospectively reviewed in the period from February/2022 to June/2006. The following variables were analyzed: mammographic density patterns, sonographic findings, patients' age, parity, body mass index and use of hormone replacement therapy. Results: Age, parity and body mass index showed a negative correlation with breast density pattern, while use of hormone replacement therapy showed a positive correlation. Supplementary breast ultrasonography was performed in 103 (43.2%) patients. Alterations which could not be visualized at mammography were found in 34 (33%) of them, most frequently in women with breast density patterns 3 and 4. Conclusion: The authors concluded that breast density patterns were influenced by age, parity, body mass index and time of hormone replacement therapy. Despite not having found any malignant abnormality in the studied cases, the authors have observed a predominance of benign sonographic abnormalities in women with high breast density patterns and without mammographic abnormalities, proving the relevance of supplementary ultrasonography to identify breast lesions in such patients.453149154(2004) Controle do câncer de mama: Documento de consenso, , http://www1.inca.gov.br/publicacoes/Consensointegra.pdf, Brasil. Ministério da Saúde. Instituto Nacional de Câncer, Rio de Janeiro, RJ: INCA, [acessado em 21 de fevereiro de 2010]. 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