Related Experiment Video
Updated: Aug 7, 2026

A Hyperandrogenic Mouse Model to Study Polycystic Ovary Syndrome
Published on: October 2, 2018
Clinical features of young women with hypergonadotropic amenorrhea
1Northwestern University Medical School, Chicago, Illinois.
Abstract:
One hundred fifteen women under age 40 presenting with hypergonadotropic amenorrhea (follicle-stimulating hormone greater than 40 mIU/mL) were evaluated. Incomplete pubertal maturation and chromosomal abnormalities were more likely in the 18 women (15.7%) with primary amenorrhea than in those with secondary amenorrhea. The 97 women with secondary hypergonadotropic amenorrhea were significantly more apt to complain of symptoms of estrogen deficiency, have been pregnant before diagnosis, and have evidence of ovulation after diagnosis. Withdrawal bleeding occurred commonly (greater than 48%) in those women administered exogenous progestin. Immune abnormalities occurred with approximately equal frequency (17.4%), and spinal bone density was decreased in both groups.
More Related Videos
Related Concept Videos
Oogenesis
Oogenesis
Each primary oocyte is surrounded by a layer of pre-granulosa cells, forming what is known...
Hormonal Control of the Ovarian Cycle
Before puberty, the hypothalamus releases GnRH in a low frequency, low amplitude pulsatile manner. This along with the immature hypothalamic-pituitary-gonadal axis activity, results in low estrogen levels and the absence of a fully functional ovarian cycle. At puberty, GnRH secretion increases in both frequency and...
Menopause
Hyperthyroidism I: Introduction
Graves Disease II: Pathophysiology

