Reproductive Endocrinology Practice Questions

Q: In which of the following conditions does hypogonadism and anosmia coexist?

Kallman syndrome. ### Explanation **Kallmann Syndrome** is the correct answer because it is characterized by the failure of **GnRH-secreting neurons** to migrate from the olfactory placode to the hypothalamus during embryonic development. This results in: 1. **Hypogonadotropic Hypogonadism:** Low GnRH leads to low FSH/LH and subsequent low sex steroids (delayed puberty/amenorrhea). 2. **Anosmia or Hyposmia:** Due to the agenesis or hypoplasia of the olfactory bulbs. It is often associated with the *KAL-1* gene mutation (X-linked) or *FGFR1* mutations. **Analysis of Incorrect Options:** * **Mayer-Rokitansky-Küster-Hauser (MRKH) Syndrome:** Characterized by Müllerian agenesis (absent uterus and upper 2/3 of the vagina) in a 46,XX female. These patients have **normal ovarian function** and a normal sense of smell. * **Noonan Syndrome:** Often called "Male Turner Syndrome," it involves short stature, webbed neck, and pulmonary stenosis. While it can cause cryptorchidism and delayed puberty, it is not typically associated with anosmia. * **Asherman Syndrome:** An acquired condition involving intrauterine adhesions (synechiae) usually following over-vigorous curettage. It causes secondary amenorrhea but does not affect the hypothalamic-pituitary-ovarian axis or the sense of smell. **High-Yield Clinical Pearls for NEET-PG:** * **Inheritance:** Most commonly X-linked recessive (KAL-1 gene). * **Clinical Presentation:** Primary amenorrhea, failure of secondary sexual characteristics, and "color blindness" (sometimes associated). * **Diagnosis:** Low FSH, Low LH, Low Estrogen/Testosterone + MRI showing absent olfactory bulbs. * **Treatment:** Pulsatile GnRH or exogenous gonadotropins to induce puberty and fertility.

Q: Diethylstilbesterol causes which of the following defects, except?

Renal anomalies. **Explanation:** Diethylstilbestrol (DES) is a synthetic non-steroidal estrogen that was historically used to prevent miscarriages. However, it is a potent **teratogen** that interferes with the development of the **Müllerian ducts** (Paramesonephric ducts). **1. Why Renal Anomalies is the Correct Answer:** Renal anomalies are typically associated with primary Müllerian duct agenesis (e.g., Mayer-Rokitansky-Küster-Hauser syndrome) because the urinary and reproductive systems develop simultaneously from the intermediate mesoderm. However, DES exposure does not cause renal defects; it causes **structural remodeling** of the already formed reproductive tract. Therefore, renal anomalies are NOT a feature of DES exposure. **2. Analysis of Incorrect Options:** * **Vaginal Adenosis:** This is the most common structural change in DES-exposed daughters. It involves the persistence of glandular columnar epithelium in the vagina (which should normally be stratified squamous). It is a precursor to **Clear Cell Adenocarcinoma** of the vagina. * **T-shaped Uterus:** DES interferes with the mesenchymal-epithelial interactions during uterine development, leading to a constricted, T-shaped uterine cavity, which increases the risk of preterm labor and ectopic pregnancy. * **Perifimbrial Cysts:** DES exposure is associated with various adnexal abnormalities, including perifimbrial cysts, paratubal cysts, and fimbrial deformity. **High-Yield Clinical Pearls for NEET-PG:** * **Classic Triad of DES Exposure:** Vaginal adenosis, T-shaped uterus, and Clear Cell Adenocarcinoma (Vagina/Cervix). * **Cervical Changes:** "Coxcomb" cervix, cervical collars, and cervical hypoplasia. * **Male Offspring:** DES exposure can lead to epididymal cysts, cryptorchidism, and microphallus. * **Key Association:** Always link DES with **Clear Cell Adenocarcinoma**; it is a favorite "except" type question in exams.

Q: Which of the following is NOT a component of the Rotterdam criteria for diagnosing polycystic ovarian syndrome?

Hyperinsulinism. The **Rotterdam Criteria (2003)** is the current gold standard for diagnosing Polycystic Ovarian Syndrome (PCOS). To make a diagnosis, at least **two out of the three** specific criteria must be present, after excluding other etiologies (like CAH or Cushing’s). ### Why Hyperinsulinism is the Correct Answer: While **hyperinsulinism** and insulin resistance are central to the pathophysiology of PCOS (driving the ovaries to produce excess androgens), they are **not** part of the formal diagnostic criteria. A patient can be diagnosed with PCOS even if they have normal insulin sensitivity, provided they meet the other criteria. ### Explanation of Incorrect Options: * **A. Multiple cysts in ovaries (PCO morphology):** Defined as ≥12 follicles (measuring 2–9 mm) in either ovary or an increased ovarian volume (>10 mL). *Note: Newer guidelines suggest ≥20 follicles if using high-frequency probes.* * **B. Anovulation:** Specifically, oligo-ovulation or anovulation, usually manifesting as irregular periods (cycles >35 days or <8 per year). * **C. Hyperandrogenism:** This can be **clinical** (hirsutism, acne, male-pattern baldness) or **biochemical** (elevated serum testosterone or DHEAS). ### High-Yield NEET-PG Pearls: * **LH:FSH Ratio:** Classically 3:1, but no longer used for diagnosis. * **Hirsutism Scoring:** The **Modified Ferriman-Gallwey score** is used (Score ≥8 is significant in most populations). * **Gold Standard Treatment:** Lifestyle modification (weight loss) is the first-line management. * **Drug of Choice:** **Clomiphene citrate** (traditionally) or **Letrozole** (now preferred) for ovulation induction; **Metformin** for insulin resistance.

Q: A patient presents with primary amenorrhea. On examination, she has normal breast and pubic hair development but no visible vagina. Which of the following is the most probable diagnosis?

Mullerian agenesis. **Explanation:** The patient presents with **primary amenorrhea** despite having **normal secondary sexual characteristics** (breast and pubic hair development). This indicates a functioning hypothalamic-pituitary-ovarian axis and normal peripheral response to hormones, but a structural defect in the outflow tract. **1. Why Mullerian Agenesis (MRKH Syndrome) is correct:** In Mullerian agenesis (Mayer-Rokitansky-Küster-Hauser syndrome), the 46,XX female has normal ovaries producing estrogen (leading to **normal breast development**) and normal adrenal/ovarian androgens (leading to **normal pubic hair**). However, the Mullerian ducts fail to develop, resulting in the absence of the uterus, cervix, and the upper two-thirds of the vagina. **2. Why the other options are incorrect:** * **Turner’s Syndrome (45,XO):** Characterized by "streak ovaries." The lack of estrogen results in **absent breast development** and primary amenorrhea. * **Androgen Insensitivity Syndrome (46,XY):** While these patients have breast development (due to peripheral conversion of testosterone to estrogen), they have **absent or scanty pubic and axillary hair** because of end-organ insensitivity to androgens. * **Swyer Syndrome (46,XY pure gonadal dysgenesis):** These patients have streak gonads and lack estrogen, leading to **absent breast development**. **High-Yield Clinical Pearls for NEET-PG:** * **First investigation:** Pelvic Ultrasound (to confirm the presence/absence of the uterus). * **Gold standard investigation:** MRI. * **Karyotype:** 46,XX (distinguishes it from AIS). * **Associated anomalies:** Renal (40% - e.g., renal agenesis, ectopic kidney) and Skeletal (12% - e.g., Klippel-Feil syndrome). Always screen the renal system in these patients.

Q: What are the causes of female pseudohermaphroditism?

21-alpha hydroxylase deficiency. **Explanation:** **Female Pseudohermaphroditism** (now termed 46,XX Disorder of Sex Development) refers to individuals with a 46,XX karyotype and normal ovaries, but whose external genitalia are virilized due to excessive androgen exposure in utero. **Why Option B is Correct:** **21-alpha hydroxylase deficiency** is the most common cause of **Congenital Adrenal Hyperplasia (CAH)**, accounting for over 90% of cases. In this condition, a block in the cortisol synthesis pathway leads to an accumulation of precursors (like 17-OH progesterone), which are shunted into the androgen pathway. The resulting high levels of testosterone cause virilization of the female fetus (ambiguous genitalia, clitoromegaly), making it the classic cause of female pseudohermaphroditism. **Why Other Options are Incorrect:** * **Option A (17-alpha hydroxylase deficiency):** This enzyme is required for the production of both cortisol and sex hormones. Deficiency leads to a **lack of androgens**, resulting in sexual infantilism in females and **male pseudohermaphroditism** (undervirilization) in males. * **Option C (Mixed Gonadal Dysgenesis):** This is a chromosomal disorder (typically 45,X/46,XY mosaicism) characterized by a streak gonad on one side and a testis on the other. It is not a cause of female pseudohermaphroditism, as the karyotype is not 46,XX. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause of ambiguous genitalia** in a newborn: CAH (21-hydroxylase deficiency). * **Biochemical Marker:** Elevated **17-hydroxyprogesterone (17-OHP)**. * **Clinical Presentation:** Salt-wasting crisis (hyponatremia, hyperkalemia, hypotension) occurs in 75% of cases due to aldosterone deficiency. * **Maternal causes:** Androgen-secreting tumors (Luteoma of pregnancy) or intake of progestogens/androgens during pregnancy can also cause female pseudohermaphroditism.

Q: For hormonal study, which wall of the vagina should the sample be taken from?

Lateral wall. **Explanation:** In gynecological practice, hormonal evaluation via vaginal cytology (often referred to as a **Maturation Index**) relies on the assessment of squamous epithelial cells. The correct site for sampling is the **upper third of the lateral vaginal wall**. **Why the Lateral Wall?** The lateral vaginal wall is the most sensitive to hormonal fluctuations (estrogen and progesterone) because it is less affected by external factors. Estrogen promotes the maturation of the epithelium into superficial cells, while progesterone leads to an increase in intermediate cells. Sampling from this specific site provides a "clean" hormonal profile, as it is relatively protected from inflammatory changes and mechanical irritation. **Why other options are incorrect:** * **Anterior Wall:** This area is frequently subject to mechanical friction and is in close proximity to the urethra, which can lead to contamination with inflammatory cells or urinary sediment, skewing the hormonal interpretation. * **Posterior Wall:** This site is the primary reservoir for the **vaginal pool**. Samples taken here often contain debris, inflammatory exudate, and degenerating cells from the cervix or uterus, making it unsuitable for accurate hormonal cytological assessment. * **Any Wall:** Hormonal assessment requires standardization. Using "any wall" would lead to inconsistent results due to the varying degrees of inflammation and debris found in different vaginal fornices. **High-Yield NEET-PG Pearls:** * **Maturation Index (MI):** Expressed as a ratio of **Parabasal : Intermediate : Superficial** cells. * **Estrogen Effect:** Causes a "shift to the right" (increase in superficial cells). * **Progesterone Effect:** Causes a "shift to the middle" (increase in intermediate cells). * **Clinical Use:** Though largely replaced by serum assays, it remains a classic exam topic for assessing primary amenorrhea or menopause.

Q: In Polycystic Ovary Syndrome (PCOS), increased estrone levels are derived from which precursor?

Androstenedione. **Explanation:** In Polycystic Ovary Syndrome (PCOS), the characteristic hormonal imbalance involves elevated androgens and a state of "unopposed estrogen." The primary source of this estrogen is the **peripheral aromatization** of androgens in adipose tissue. **Why Androstenedione is correct:** In PCOS, the ovaries (and to a lesser extent, the adrenals) overproduce **Androstenedione**. This precursor is converted into **Estrone (E1)** via the enzyme **aromatase**, primarily within peripheral fat cells. Unlike the cyclic production of Estradiol (E2) in a normal menstrual cycle, the chronic elevation of Estrone in PCOS provides constant positive feedback to the pituitary for LH secretion and negative feedback for FSH, contributing to the characteristic high LH:FSH ratio and chronic anovulation. **Analysis of Incorrect Options:** * **Testosterone:** While testosterone is elevated in PCOS, its peripheral aromatization primarily yields **Estradiol (E2)**, not Estrone. * **Dehydroepiandrosterone (DHEA):** DHEA is an upstream weak androgen. While it can eventually be converted to androstenedione, it is not the immediate precursor to estrone. * **GnRH:** This is a peptide hormone produced by the hypothalamus that regulates the release of LH and FSH; it is not a steroid precursor for estrogen. **High-Yield Clinical Pearls for NEET-PG:** * **The "PCOS Estrogen":** Remember that **Estrone (E1)** is the predominant estrogen in PCOS (and menopause), whereas **Estradiol (E2)** is the predominant estrogen in reproductive-age women. * **Endometrial Risk:** Chronic high levels of Estrone lead to endometrial hyperplasia, significantly increasing the risk of **Endometrial Carcinoma**. * **The Vicious Cycle:** Increased insulin (Hyperinsulinemia) decreases **Sex Hormone Binding Globulin (SHBG)**, further increasing the levels of free (active) androgens available for conversion to estrone.

Q: A girl presents with primary amenorrhea, normal breast development, hirsutism, and acne. What is the most probable diagnosis?

Polycystic Ovarian Disease (PCOD). ### Explanation The clinical presentation of **primary amenorrhea** combined with **normal breast development** and signs of **hyperandrogenism** (hirsutism and acne) is a classic indicator of Polycystic Ovarian Disease (PCOD/PCOS). **1. Why PCOD is the Correct Answer:** In PCOD, the hypothalamic-pituitary-ovarian axis is functional, leading to adequate estrogen production and **normal breast development** (Tanner Stage 5). However, an imbalance in LH/FSH ratios and insulin resistance leads to excess ovarian androgen production. This hyperandrogenism causes **hirsutism and acne**. While PCOD typically presents as secondary amenorrhea, it is a recognized cause of primary amenorrhea in roughly 5-10% of cases where the hormonal imbalance occurs at the onset of puberty. **2. Why Other Options are Incorrect:** * **Klinefelter Syndrome (47, XXY):** This occurs in phenotypic males. They present with small testes, gynecomastia, and infertility, not primary amenorrhea. * **Turner’s Syndrome (45, XO):** These patients typically have **streak ovaries** (estrogen deficiency), resulting in **absent/poor breast development** and short stature. Hyperandrogenism is not a feature. * **Gonadal Dysgenesis:** Similar to Turner’s, there is a failure of ovarian development. Without estrogen, there is no breast development (sexual infantilism). **3. High-Yield Clinical Pearls for NEET-PG:** * **Rotterdam Criteria for PCOS:** Requires 2 out of 3: (1) Oligo/anovulation, (2) Clinical/biochemical hyperandrogenism, (3) Polycystic ovaries on ultrasound. * **LH:FSH Ratio:** Often >2:1 or 3:1 in PCOS. * **Differential for Primary Amenorrhea with Normal Breasts:** Always consider PCOD, Mullerian Agenesis (MRKH), and Androgen Insensitivity Syndrome (AIS). The presence of hirsutism specifically points toward PCOD or Adrenal Hyperplasia.

Question 1

In which of the following conditions does hypogonadism and anosmia coexist?

Accepted Answer

Kallman syndrome

Answer

Mayer-Rokitansky-Kuster syndrome

Answer

Noonan Syndrome

Answer

Ashermann syndrome

Question 2

Diethylstilbesterol causes which of the following defects, except?

Accepted Answer

Renal anomalies

Answer

Perifimbrial cysts

Answer

T shaped uterus

Answer

Vaginal adenosis

Question 3

Which of the following is NOT a component of the Rotterdam criteria for diagnosing polycystic ovarian syndrome?

Accepted Answer

Hyperinsulinism

Answer

Multiple cysts in ovaries seen on ultrasound

Answer

Anovulation

Answer

Clinical or biochemical hyperandrogenism

Question 4

A patient presents with primary amenorrhea. On examination, she has normal breast and pubic hair development but no visible vagina. Which of the following is the most probable diagnosis?

Accepted Answer

Mullerian agenesis

Answer

Turner's syndrome

Answer

Androgen insensitivity syndrome

Answer

Swyer syndrome

Question 5

What are the causes of female pseudohermaphroditism?

Accepted Answer

21-alpha hydroxylase deficiency

Answer

17-alpha hydroxylase deficiency

Answer

Mixed gonadal dysgenesis

Answer

All of the above

Question 6

For hormonal study, which wall of the vagina should the sample be taken from?

Accepted Answer

Lateral wall

Answer

Anterior wall

Answer

Posterior wall

Answer

Any wall

Question 7

Which of the following hormonal changes are typically observed in Polycystic Ovary Syndrome (PCOS)?
(i) Luteinizing hormone (LH) is elevated
(ii) Total free estrone is decreased
(iii) Insulin is elevated
(iv) Sex hormone-binding globulin (SHBG) is increased
(v) Progesterone is decreased

Accepted Answer

True, False, True, False, True

Answer

False, False, True, True, False

Answer

True, True, True, False, True

Answer

False, True, True, False, True

Question 8

Which of the following conditions presents with the absence of both Mullerian and Wolffian duct structures?

Accepted Answer

Androgen Insensitivity Syndrome

Answer

Antimullerian Hormone deficiency

Answer

FSH Receptor defect

Answer

Ovotesticular syndrome

Question 9

In Polycystic Ovary Syndrome (PCOS), increased estrone levels are derived from which precursor?

Accepted Answer

Androstenedione

Answer

Testosterone

Answer

Dehydroepiandrosterone

Answer

Gonadotropin-releasing hormone (GnRH)

Question 10

A girl presents with primary amenorrhea, normal breast development, hirsutism, and acne. What is the most probable diagnosis?

Accepted Answer

Polycystic Ovarian Disease (PCOD)

Answer

Klinefelter syndrome

Answer

Turner's syndrome

Answer

Gonadal dysgenesis

Reproductive Endocrinology — MCQs

Reproductive Endocrinology — MCQs

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