Histology report: (immunohistochemistry with antibodies to CK5/6, estrogen, calponin): intraductal proliferation with atypia; the pronounced lymphoid infiltration of stroma around the ducts (presumably, explains the shining on STIR). Within the epithelial layer the expression of CK5/6 is missed, which agreed with DCIS. Myoepithelium all of the ducts exhibits an expression of calponin that excludes the presence of the invasive component. There is a moderate expression of estrogen in the ducts without any staining gradient in the intraductal proliferation that is consistent with DCIS.
Conclusion: pTis, DCIS, Grade 2.