Paranasal sinus disease- can someone please explain my results to me? there are small retention cysts in both inferior maxillary antra, the larger on the left measuring up to 15 mm in maximum dimension?

You have an established sinus infection and the tissue has grown around and contains toxic material and it needs attention from an Ear,Nose and Throat specialist. Take a lokka at the information sheet here: https://drneilmcleod.com/information-sheets/ and try to develop a relationship with your doctor so that their explanations are better understood. Best wishes.