I think I read that most functional cysts (the type we get each month anyway when we ovulate) run 1-2 cm. 8 mm isn't even a full centimeter yet. But Sharon is right - ask them what they mean by "complex." Does that mean it has blood in it, does it have septations, is it partly solid? That might help.
Are you going back for a follow-up visit or did they just give you the report and say nothing more?
i really dont know the norms for all the measurements but i sure would ask for a clarification on the word "complex"
best wishes
sharon