A woman with two children presents with galactorrhea and amenorrhea for one year. The most probable diagnosis is:
Q362
All of the following features are similar in androgen insensitivity syndrome and Mullerian agenesis except:
Q363
In a clinical scenario where a patient experiences withdrawal bleeding after continuous administration of progestins, which of the following factors is most likely responsible?
Q364
The most characteristic clinical feature of androgen insensitivity syndrome (testicular feminization syndrome) is:
Reproductive Endocrinology Indian Medical PG Practice Questions and MCQs
Question 361: A woman with two children presents with galactorrhea and amenorrhea for one year. The most probable diagnosis is:
A. Ectopic pregnancy
B. Prolactinoma (Correct Answer)
C. Pituitary apoplexy
D. Hypothalamic dysfunction
Explanation: ***Prolactinoma***
- The classic presentation of **galactorrhea** (milk production unrelated to pregnancy or breastfeeding) and **amenorrhea** (absence of menstruation) in a non-pregnant woman strongly suggests hyperprolactinemia, most commonly due to a **prolactin-secreting pituitary adenoma** (prolactinoma).
- High prolactin levels can inhibit GnRH pulsatility from the hypothalamus, leading to decreased LH and FSH secretion, which in turn causes **anovulation** and thus amenorrhea.
*Ectopic pregnancy*
- This condition presents with symptoms like **abdominal pain**, vaginal bleeding, and a **positive pregnancy test**, which are not mentioned here.
- While an ectopic pregnancy is a cause of amenorrhea, it does not typically cause galactorrhea.
*Pituitary apoplexy*
- This is an acute, life-threatening condition caused by hemorrhage or infarction of the pituitary gland, presenting with **sudden severe headache**, visual disturbances, and altered mental status.
- While it can affect pituitary function, its acute onset and severe symptoms are inconsistent with the one-year history of galactorrhea and amenorrhea.
*Hypothalamic dysfunction*
- Although hypothalamic dysfunction can cause amenorrhea due to impaired GnRH release, it typically presents with **low or normal prolactin levels**, not elevated prolactin causing galactorrhea.
- Conditions like **functional hypothalamic amenorrhea** (due to stress, excessive exercise, or low body weight) would involve a different hormonal profile.
Question 362: All of the following features are similar in androgen insensitivity syndrome and Mullerian agenesis except:
A. Absent Mullerian duct
B. Normal axillary hair (Correct Answer)
C. Breast development
D. Primary amenorrhea
Explanation: ***Normal axillary hair***
- In **androgen insensitivity syndrome (AIS)**, there is typically **sparse or absent pubic and axillary hair** due to the body's inability to respond to androgens, despite normal or elevated testosterone levels.
- In **Müllerian agenesis (MRKH syndrome)**, ovarian function is normal with normal androgen production and response, resulting in **normal axillary and pubic hair development**.
- This is the **key differentiating feature** between the two conditions.
*Absent Mullerian duct*
- Both conditions feature **absent or rudimentary Müllerian duct** derivative structures (uterus, fallopian tubes, upper vagina).
- In AIS, this is due to **Müllerian-inhibiting substance (MIS)** produced by functional testes. In MRKH, it's due to congenital developmental failure of the Müllerian ducts.
*Breast development*
- Both conditions show **normal breast development**.
- In AIS, breast development occurs due to peripheral **aromatization of testosterone to estrogen** (breast tissue does not require androgen receptors for estrogen response).
- In MRKH, breast development is normal due to **normal ovarian estrogen production**.
*Primary amenorrhea*
- Both conditions present with **primary amenorrhea**, defined as absence of menstruation by age 15.
- In AIS, amenorrhea occurs because the uterus is absent (Müllerian structures did not develop due to MIS from testes).
- In MRKH, the uterus is absent or rudimentary due to Müllerian agenesis, despite having functional ovaries with normal cyclic hormonal changes.
Question 363: In a clinical scenario where a patient experiences withdrawal bleeding after continuous administration of progestins, which of the following factors is most likely responsible?
A. Estrogen concentration is sufficient (Correct Answer)
B. Structural abnormality in the pelvis
C. Associated with endocrine disorder
D. Atrophic endometrium
Explanation: ***Estrogen concentration is sufficient***
- Withdrawal bleeding after progestin administration indicates that the endometrium has been adequately primed by **estrogen**.
- Progestins induce secretory changes in the endometrium, and their subsequent withdrawal leads to shedding if sufficient estrogen has stimulated initial endometrial proliferation.
*Structural abnormality in the pelvis*
- **Structural abnormalities** like fibroids or polyps can cause abnormal uterine bleeding, but they do not typically explain withdrawal bleeding after progestin cessation.
- These conditions would likely cause irregular bleeding patterns irrespective of hormonal manipulation.
*Associated with endocrine disorder*
- While endocrine disorders can cause **abnormal uterine bleeding**, withdrawal bleeding after progestin therapy suggests a hormonal response.
- Endocrine disorders might be the underlying reason for initial anovulation, but the progestin challenge itself is a diagnostic tool to assess endometrial estrogenization.
*Atrophic endometrium*
- An **atrophic endometrium** would not typically bleed after progestin withdrawal because it lacks sufficient estrogen priming.
- Withdrawal bleeding implies that there was an adequately proliferated endometrium to begin with, which is then transformed by progestins.
Question 364: The most characteristic clinical feature of androgen insensitivity syndrome (testicular feminization syndrome) is:
A. Buccal smear shows no Barr bodies
B. Normal breast development is observed (Correct Answer)
C. Menstruation is absent due to primary amenorrhea
D. Testes are present but non-functional
Explanation: ***Normal breast development is observed***
- This is the **most characteristic clinical feature** of **androgen insensitivity syndrome (AIS)** that creates the striking paradox of the condition.
- Individuals with AIS have normal or elevated levels of **testosterone**, which is aromatized to **estrogen**.
- This **estrogen** promotes the development of **female secondary sexual characteristics**, including breast development.
- The presence of **normal breast development in a genetic male (46,XY)** is the hallmark presentation that brings patients to medical attention.
*Buccal smear shows no Barr bodies*
- This statement is **factually true** - a buccal smear showing **no Barr bodies** indicates a **46,XY karyotype**, which is characteristic of AIS.
- However, this is a **diagnostic test finding**, not the clinical presentation feature that defines the syndrome.
- It helps confirm the diagnosis but is not the primary characteristic feature.
*Menstruation is absent due to primary amenorrhea*
- This statement is also **factually true** - **primary amenorrhea** is present in AIS.
- Menstruation is absent because individuals with AIS **lack a uterus**, fallopian tubes, and ovaries due to **Müllerian inhibiting factor (MIF)** produced by Sertoli cells in the testes.
- However, primary amenorrhea alone is non-specific and occurs in many conditions.
*Testes are present but non-functional*
- This statement is **incorrect** - while the **testes are present** (usually intra-abdominal or inguinal), they are **functionally active**.
- They produce testosterone (which converts to estrogen) and Müllerian inhibiting factor.
- The testes are functional in hormone production; the defect is in **androgen receptor insensitivity** in target tissues.
