growth of one follicle outstrips others and produces inhibin leading to atresia of other follicles (those initially stimulated by FSH) as the levels of FSH fall during the mid-follicular phase
there is a marked increase in oestrogen production by the remaining (dominant) follicle that precedes ovulation
Reference
Munro MG, Critchley HOD, Fraser IS., FIGO Menstrual Disorders Committee. The two FIGO systems for normal and abnormal uterine bleeding symptoms and classification of causes of abnormal uterine bleeding in the reproductive years: 2018 revisions. Int J Gynaecol Obstet. 2018 Dec;143(3):393-408
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