[BI-RADS] Mammo: A manifestation of sedimented calcifications in macro- or microcysts. On the craniocaudal image-- they are often less evident and appear as round, smudgy deposits, while occasionally on MLO and especially on 90 degree lateral (LM/ML) views, they are more clearly defined and often semilunar, crescent shaped, curvilinear (concave up) or linear, defining the dependent portion of cysts. The most important feature of these calcifications is the apparent change in shape of the calcific particles on different mammographic projections (craniocaudal versus occasionally the MLO view and especially LM/ML views).