<prompt> Corpus luteum cyst occurs due to:HCGHPLEstrogenProgesterone  <response>: Grandiose lutein cystFunctional, non neoplastic.enlargement of the ovary.:,Persistent corpus luteum cyst may cause local pain,tenderness or delayed menstruationCysts are often palpable clinicallyUsually resolve spontaneouslyTheca lutein cystThey are associated tropphoblastic disease, chorionic gonadotrophin therapy HCG clomiphene therapy.They are bilateral and filled with straw coloured fluid.They resolve spontaneously after elimination of the H mole, therapeutic curettage, destruction of chorio-carcinoma or discontinuation of gonadotrophin therapy. 