Microcalcifications are tiny bits of calcium that may show up in clusters or in patterns (like circles) and are associated with extra cell activity in breast tissue. Usually the extra cell growth is not cancerous, but sometimes tight clusters of microcalcifications can indicate early breast cancer. Scattered microcalcifications are usually a sign of benign breast tissue.
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National Cancer Institute. Diagnosis: Mammogram: Abnormal: Microcalcifications National Cancer Institute. 1993.