Please tell me how dangerous is the condition of bilateral polycystic ovaries with right endometrioma. Size of the cysts are 27mmby27mm?

Not dangerous. The biggest danger with polycystic ovarian syndrome is that often it's accompanied by no period, anovulation, which puts women at increased risk of uterine cancer. In addition, can be associated with increased risk of diabetes. Endometriomas won't hurt your, but can affect fertility. See gynecologist to determine if you need treatment.