i just had a bilateral diagnostic mammogram which showed calcifications in both breasts, but more in the left one. then had a breast ultrasound of the left breast which showed a possible cyst and confirmed the calcifications. the radiologist said i have both macro- and micro-calcifications in the left one. the right one seems 'normal'.... she recommended a stereotactic biopsy. so what might cause calcifications in both breasts... and more importantly, could i have something more serious in the left one (ie cancer)?