It sounds like good results. And it sounds like you definitely ovulate, hence the collapsed follicle.
The stroma is the soft connective tissue that covers the ovary. The peripheral follicles are what is leading them to suspect mild PCOS. In PCOS the follicles tend to grow along the periphery of the ovary. Usually, 12 or more is a good indication of PCOS. The vast majority of women with PCOS have difficulty ovulating on their own or do not. The collapsed follicle is indicitive of ovulation, which is a very good sign. The fact that "mild" is used is also good. It may sound scary, but you are on the right path. I have had "unexplained infertility" for more than 20yrs. It is nice to know you have a good outlook for treatment. Especially with mild PCOS. Often, Metformin alone will keep it under control. Good luck to you! :) Did your dr make an appt to discuss the results and the course of treatment?
All this means is that you have a cluster of cysts that are looking like polycystic ovarian syndrome. Ovarian cyst can be normal. The only time they consider it a syndrome is when you are having complications do to the cysts like insulin resistance, irregular or absent periods, annovulatory cycles, etc. If you Doc was concerned I'm sure he would have talked to you about it. But if your worried don't hesitate to call you doctor and have then explain your results.
Also-the collapsed follicle sounds like a good thing-they develop on the ovary to develop an egg and release it, and then if no pregnancy results they collapse.
I agree though-call the doctor! If they are trying to help figure this out, they should be willing to see you more often, or at least talk to you and come up with a plan-waiting four weeks wouldn't be acceptable to me, that's a whole cycle! Just my opinion though.
did you ask the doctor? call him but it seems like he could be stating that PCOS is a possiblity. which really is not a bad thing. simple medications will help you ovulate. does he have you set up for the test to see if you ovulate and release an egg? i think it is just simple blood work.
also why did he do an ultrasound instead of an HSG?