Why is ultrasound better than mammography when examining dense breasts?

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Why is ultrasound better than mammography when examining dense breasts?

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Dense breast tissue shows up white on a mammogram and fatty tissue shows up as black. Cancerous tissue also shows up as white on a mammogram. Therefore it is sometimes hard to distinguish dense tissue from cancerous tissue. On an ultrasound cancerous tissue shows up black and dense tissue is still white, therefore cancers are easier to distinguish.

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