The below link is video cast of a lecture by Katherine Sheriff, M.D.
Drexel University, on The Management of Polycystic Ovarian Syndrome in Oct 2005
http://videocast.nih.gov/ram/orwh102805.ram
EDITED TO ADD:
I have this lecture on right now. It gets a little technical in the middle, but try to hang in there. About 30 minutes into the lecture, she gets into genetic components (mom's AND dads...). She also discusses THIN cysters, and other things that some doctors overlook when it comes to diagnosing PCOS. She also shows pictures of patients with AN (ie the dark skin patches).
VERY GOOD LECTURE! Make yourself a cup of coffee, and watch the entire program. It's about an hour.
VIDEO CAST: Managing PCOS 
