2.2. Histopathological Verification

All patients underwent a core needle biopsy (CNB) of the detected lesions. Biopsy was performed using the BARD^® MAGNUM^® Reusable Core Biopsy System, with additional control by ultrasound or MRI. The biopsy specimens were sent for histopathological processing, where the following parameters were examined: histological sub-type of tumor, tumor size, estrogen receptor, progesterone receptor, and HER2 status. The size of the tumor was defined by the imaging method. In multifocal breast cancer, the sum of the diameters of the malignant lesions was calculated.