Ultrasound assessment of ovarian volume, follicular size, and uterine growth was undertaken in 40 normal premenarcheal girls aged 6 months to 14 years. Ovarian follicles were detected from 6 months of age and increased in size and number, so that after the age of 8.5 years there was a progressive increase in the incidence of 'megalocystic' appearance. Eight girls with idiopathic precocious puberty had large megalocystic ovaries which regressed on treatment with gonadotrophin releasing hormone analogue. These findings contrasted with those seen in two prepubertal patients with hypogonadotrophic hypogonadism in whom the natural sequence of ovarian development was greatly accelerated by pulsatile administration of native gonadotrophin releasing hormone.
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