Article Breast Contrast-enhanced spectral mammographic (CESM) Phyllodes tumors adult breast biopsy cancer diagnosis cancer surgery case report clinical article color Doppler flowmetry contrast enhanced mammography contrast enhanced spectral mammography coronavirus disease 2019 echography female human human tissue imaging immunohistochemistry mastectomy middle aged mitosis rate myoepithelium cell nuclear magnetic resonance imaging pandemic phyllodes tumor proliferation index tumor vascularization