When do heterogeneous ovarian cysts occur, before or after ovulation?

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First of all, 0.5 inch is a very small size for a cyst. Because, in every cycle around ovulation one of your ovary makes around one inch follicle (cyst). In a sonography, if it looks clear without any shadow in the cyst, then it is homogeneous and when something is found floating in the cyst as echoes (shadow), then it is called heterogeneous. Homogeneous have clear fluid. In heterogeneous cyst, the shadow may be due to blood, pus cells, epithelial cells, other debris, hormones, enzymes or turbid fluid.

In small sized cysts, it is not so much important that whether it is heterogeneous or homogeneous because it is mostly going to disappear around your period. Before ovulation, mostly follicles are with clear fluid. After ovulation, it may be homogeneous or heterogeneous with decreased size. Actually, it looks like disappearing follicle and not a cyst. A cyst can disturb your cycle only if it is of a bigger size and remains even after menstruation. Mostly it begins from unruptured follicle during ovulation and the size can be from 1.5 to 4 inch or even bigger in some case. This type of cyst requires treatment.