Hi, welcome to HCM
shows left overy has enlarged in size significantly. There is a mass with solid(mural nodule) and cystic componant, which has differentials of benign as well as malignant lesion. As there is no vascularity of solid part(no color doppler flow) it is less likely malignant. however it will depends on your age, marital status, child issue etc. Aterial waveform is normal in both ovaries.
It will better if you go for further imaging, MRI
pelvis, after your gynecologist opinion.