The tattoo sign is a feature given to describe dermal calcifications seen on mammography 1. The basis of this sign is that dermal calcifications maintain fixed relationships to one another which are reproducible with similar projections at different times. This is in contrast to intramammary calcifications in which the relationship of the calcifications to one another can change as the tissue is compressed 2.
Dermal calcification has certain characteristics such as lucent centres, polygonal or spherical shape, presence of the tattoo sign, and peripheral location of the calcification. At times, the tattoo sign may be the only finding.
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