A traditional mammogram image, like an X-ray, produces a two-dimensional view. Breast structures can overlap, hiding a tumor or making normal tissue look suspicious. A 3-D mammogram added to the standard test yields many image “slices” that, when assembled, provide a more nuanced view.

Sources: Julianne Greenberg, Director of Breast Imaging at Washington Radiology Associates; Hologic; Nuclear Regulatory Commission | The Washington Post October 8, 2012
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