What is a microcalcification cluster and what concern does it raise?

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A microcalcification cluster is a group of many tiny calcium deposits confined to a small area on a mammogram. This pattern is suspicious because it can reflect early ductal disease, most commonly ductal carcinoma in situ or an early invasive cancer. The concern increases when the calcifications are fine and irregular or arranged in a linear or branching pattern, as these morphologies are more often associated with malignant processes. Because of this, a cluster typically prompts additional imaging and diagnostic workup, possibly including biopsy, to determine whether cancer is present. A single large calcification is more likely benign, and calcifications around implants or the absence of calcifications do not describe a cluster.