High-Grade Ductal Carcinoma In Situ of the Breast With Regressive Changes: Radiological and Clinicopathological Findings.

DCIS with RC lesions present most often as microcalcifications alone on both mammography and US. MRI features are not distinguishable from those of other DCIS lesions. DCIS with RC lesions show biomarker status reflecting more aggressive behavior and high upgrade rate to invasive cancer.