Dominant Follicle in Ovaries

Roughly a week before the midpoint of the menstrual cycle the dominant follicle develops in one of the two ovaries. This grows faster than the other tertiary follicles and prepares itself for ovulation. It reaches a diameter of up to 25 mm and is also known then as the graafian follicle.

A dominant follicle just means that it is not quite big enough to call it a cyst. You can have a dominant follicle if you are still in the reproductive ages. A lot of women have these on their ovaries.