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When an area of tissue on a mammogram is "isoattenuating," it means that it is of the same density as a reference tissue, and thus attenuates x-rays equally. When no reference tissue is explicitly stated, the surrounding tissue is usually implied to be the reference tissue. For example, to say, "the mammogram showed that the breast mass in question is isoattenuating," means that breast mass is the same density as the normal surrounding breast tissue.

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12y ago

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