Its because of the high levels of beta hCG secreted by the tumor in choriocarcinoma. The theca interna of ovarian follicles is normally stimulated by LH.
hCG and LH have a common alpha sub-unit, so hCG can actually stimulate LH receptors on theca interna cells to a certain extent. The over-stimulation of LH receptors by Beta-hCG causes the formation of multiple, bilateral theca lutein cysts in the ovaries.
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