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Difficulty: MediumReproductive Endocrinology and Infertility

Match the following causes of primary and secondary amenorrhea with their defining pathophysiologic mechanism.

  • Kallmann syndromeDefective migration of olfactory and gonadotropin-releasing hormone (GnRH) neurons from the olfactory placode
  • Mayer-Rokitansky-Küster-Hauser (MRKH) syndromeAgenesis of the paramesonephric ducts resulting in an absent or hypoplastic uterus and upper vagina
  • Complete androgen insensitivity syndrome (CAIS)X-linked recessive mutation of the androgen receptor leading to target tissue resistance
  • Asherman syndromeFibrotic obliteration of the uterine cavity following trauma to the basalis layer of the endometrium
  • Functional hypothalamic amenorrheaDecreased pulsatility of gonadotropin-releasing hormone (GnRH) due to energy deficit or profound psychological stress

Answer

Kallmann syndrome matches defective neuronal migration. MRKH syndrome matches paramesonephric duct agenesis. CAIS matches androgen receptor mutation. Asherman syndrome matches endometrial fibrotic obliteration. Functional hypothalamic amenorrhea matches decreased GnRH pulsatility.
Each condition matches specifically to its underlying pathophysiologic mechanism. Understanding the distinct etiology of each amenorrhea presentation allows for accurate diagnosis and management.

Step-by-Step Solution

1
Evaluate the mechanism of Kallmann syndrome and functional hypothalamic amenorrhea.
Kallmann syndrome is linked to defective GnRH neuron migration, while functional hypothalamic amenorrhea is caused by stress-induced decreases in GnRH pulsatility.
Both cause hypogonadotropic hypogonadism but via different anatomical vs. functional etiologies.
2
Differentiate the structural causes of primary amenorrhea with normal breast development.
MRKH is caused by paramesonephric (Mullerian) duct agenesis, whereas CAIS is caused by a mutated androgen receptor in a 46,XY individual.
Accurate differentiation relies on chromosomal sex and the origin of the anatomical defect.
3
Identify the acquired structural cause of secondary amenorrhea.
Asherman syndrome is identified as fibrotic obliteration of the uterine cavity following trauma.
It is an acquired intrauterine defect rather than a genetic or endocrine axis failure.

Key Concept

Pathophysiologic mechanisms of primary and secondary amenorrhea
Estimated Time:1m 30s
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Topics

Reproductive Endocrinology and Infertility

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