Pure and mixed mucinous carcinoma of the breast: pathologic basis for differences in mammographic appearance.

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Abstract
It is important to differentiate pure and mixed mucinous carcinomas of the breast because the former have a more favorable prognosis. We correlate histopathologic findings with mammographic findings for 20 patients with pure or mixed mucinous carcinomas to determine differential characteristics and their pathologic basis.We searched our pathology database of 2219 consecutive women with a diagnosis of breast cancer and found that 31 (1.4%) had mucinous carcinomas. Eleven women were excluded because the mammograms (n = 6) or the microscopic slides (n = 5) were not available. The remaining 20 women, who were 37-92 years old (mean, 64 years), were the subjects of the study. Their clinical records, mammograms, and microscopic slides were reviewed. Tumor size was based on the maximum mammographic diameter or measured diameter of the excised tumor.Seventeen patients (85%) had tumors that were mammographically apparent. Histopathologic review confirmed 15 pure mucinous tumors and five mixed mucinous tumors having...

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