I have a cystic mass in my right adnexea with an ap diameter of 35mm, what does it mean?

Common. You have a small cystic mass, probably in your ovary. Usually related to post egg expulsion cyst (corpus luteum cyst.) probably self limited.If it causes symptoms alert your provider. Your doctor will keep this finding in mind, and may request a follow up sonogram or exam in the future. Good luck.