Reproductive Endocrinology Practice Questions

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.

Q: All of the following are used in the management of hirsutism except?

Danazol. **Explanation:** The management of hirsutism focuses on reducing circulating androgens or blocking their action at the hair follicle. **Why Danazol is the correct answer (The "Except"):** Danazol is a synthetic steroid and an **isoxazole derivative of ethisterone**. It is primarily used in the treatment of endometriosis and hereditary angioedema. Crucially, Danazol has **strong androgenic properties** and can cause side effects such as weight gain, acne, and **hirsutism** itself. Therefore, it is contraindicated in the management of hirsutism as it would exacerbate the condition. **Analysis of other options:** * **Spironolactone:** This is a potassium-sparing diuretic that acts as a potent **androgen receptor antagonist** and inhibits 5-alpha reductase. It is a first-line agent for idiopathic hirsutism. * **OCPs (Oral Contraceptive Pills):** These are the first-line treatment for PCOS-related hirsutism. They work by suppressing LH (decreasing ovarian androgen production) and increasing **Sex Hormone Binding Globulin (SHBG)**, which lowers free testosterone levels. * **GnRH Agonists:** These are used in severe cases or hyperthecosis. By causing pituitary desensitization, they lead to a profound decrease in ovarian steroidogenesis. **NEET-PG High-Yield Pearls:** * **First-line drug for PCOS-related hirsutism:** OCPs. * **Most common cause of hirsutism:** PCOS (Polycystic Ovary Syndrome). * **Ferriman-Gallwey Score:** Used to clinically quantify hirsutism (Score ≥8 is significant). * **Finasteride:** A 5-alpha reductase inhibitor also used in treatment. * **Eflornithine:** A topical cream used to inhibit hair growth by blocking ornithine decarboxylase.

Q: A 23-year-old female presents with a history of recurrent abortions. Which of the following tests is NOT indicated in the investigation of recurrent abortions?

TORCH infection screening. **Explanation:** Recurrent pregnancy loss (RPL) is defined as the loss of two or more consecutive pregnancies. The investigation of RPL focuses on identifying chronic or structural causes rather than sporadic events. **Why TORCH screening is NOT indicated:** TORCH infections (Toxoplasmosis, Other, Rubella, CMV, Herpes) are known to cause **sporadic** pregnancy loss or congenital malformations. However, they do not cause **recurrent** abortions because the mother typically develops lasting immunity after the primary infection, preventing subsequent pregnancy losses from the same pathogen. Therefore, routine TORCH screening is no longer recommended in the workup of RPL. **Why the other options are indicated:** * **Parental Cytogenetics:** Indicated to rule out balanced reciprocal or Robertsonian translocations in either parent, which can lead to unbalanced gametes and recurrent miscarriages. * **Thyroid Profile:** Endocrine disorders, specifically uncontrolled hypothyroidism or the presence of anti-thyroid antibodies, are established risk factors for RPL. * **Antiphospholipid Antibodies (APLA):** Antiphospholipid Syndrome is the most important treatable causes of RPL. Testing for Lupus anticoagulant, Anticardiolipin, and Anti-β2 glycoprotein I antibodies is mandatory. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause of sporadic abortion:** Fetal chromosomal anomalies (Autosomal trisomy). * **Most common cause of RPL:** Often remains "unexplained" (approx. 50%), but among identifiable causes, APLA and uterine anomalies are frequent. * **Uterine factor:** Hysterosalpingography (HSG) or Hysteroscopy is indicated to rule out a septate uterus (the uterine anomaly most associated with RPL). * **Progesterone:** Luteal phase deficiency is a controversial but often tested endocrine cause of RPL.

Q: Which of the following is NOT a major source of androgens in females?

Corpus luteum. In the female body, androgens are produced through three primary pathways. Understanding the distribution of these sources is high-yield for NEET-PG. ### **Why "Corpus Luteum" is the Correct Answer** The **corpus luteum** is a temporary endocrine structure formed after ovulation. Its primary physiological role is the secretion of **progesterone** (to maintain the secretory endometrium) and some estrogen. While it produces small amounts of androstenedione as a precursor to estrogen, it is **not** considered a "major source" of systemic androgens. Its function is specialized for pregnancy maintenance rather than androgen contribution. ### **Analysis of Incorrect Options** * **A. Adrenals:** The adrenal glands (specifically the *zona reticularis*) contribute approximately **25%** of circulating testosterone and are the primary source of DHEA-S (95-100%). * **B. Ovaries:** The ovarian theca cells produce androgens under the influence of LH. The ovaries contribute roughly **25%** of circulating testosterone. * **C. Peripheral Conversion:** This is a significant source, accounting for the remaining **50%** of circulating testosterone. Precursors like androstenedione are converted into testosterone in the liver, skin, gastrointestinal tract, and adipose tissue. ### **Clinical Pearls for NEET-PG** * **The 25-25-50 Rule:** Remember that Testosterone in females comes 25% from Adrenals, 25% from Ovaries, and 50% from Peripheral conversion. * **DHEA-S Marker:** DHEA-S is almost exclusively produced by the adrenals. If a patient has virilization and elevated DHEA-S, the source is likely an adrenal tumor. * **Hyperandrogenism:** In PCOS (the most common cause of female hyperandrogenism), the excess androgens primarily originate from the ovarian theca cells due to elevated LH levels.

Q: Infertility is a common feature of Swyer cell syndrome because:

There are no germ cells in this condition.. **Explanation:** **Swyer Syndrome (Pure Gonadal Dysgenesis)** is a condition characterized by a **46,XY karyotype** in individuals who have a female phenotype. The underlying pathophysiology involves a failure of the primitive gonads to differentiate into testes, often due to mutations in the **SRY gene** or other sex-determining pathways (like SOX9). 1. **Why the correct answer is right:** In Swyer Syndrome, because the SRY gene fails to trigger testicular development, the bipotential gonads do not develop into testes or ovaries. Instead, they persist as non-functional, fibrous **"streak gonads."** These streak gonads lack follicles and **germ cells**. Without germ cells (oocytes), natural conception is impossible, leading to primary infertility. 2. **Why the incorrect options are wrong:** * **Options A, B, and D:** These options assume the presence of testicular tissue (Sertoli cells, blood-testis barrier, or spermatogenesis). In Swyer Syndrome, there is **no testicular development** despite the XY genotype. Therefore, these male-specific physiological processes never occur. **High-Yield Clinical Pearls for NEET-PG:** * **Phenotype:** Female external genitalia, well-developed Müllerian structures (uterus, fallopian tubes) because no Anti-Müllerian Hormone (AMH) is produced. * **Clinical Presentation:** Primary amenorrhea and delayed puberty (hypergonadotropic hypogonadism). * **Malignancy Risk:** There is a high risk (approx. 25-30%) of developing **Gonadoblastoma** or Dysgerminoma in the streak gonads; therefore, prophylactic **gonadectomy** is recommended upon diagnosis. * **Fertility Potential:** While naturally infertile, patients **can achieve pregnancy** through **Oocyte Donation** and IVF, as they have a functional uterus.

Question 1

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 2

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

Question 3

Which of the following are true about Stein-Leventhal syndrome?

Accepted Answer

Seen in post-menopausal women

Answer

Oligomenorrhea and amenorrhea

Answer

Numerous cysts in ovary

Answer

Theca cell hypertrophy

Question 4

Ovarian senescence is described by all of the following except:

Accepted Answer

Follicular activation is dependent on pituitary stimulation.

Answer

Begins in utero within the embryonic ovary.

Answer

More rapid in the late 30s and early 40s.

Answer

Programmed oocyte atresia.

Question 5

All of the following are used in the management of hirsutism except?

Accepted Answer

Danazol

Answer

Spironolactone

Answer

GnRH

Answer

OCPs

Question 6

A 23-year-old female presents with a history of recurrent abortions. Which of the following tests is NOT indicated in the investigation of recurrent abortions?

Accepted Answer

TORCH infection screening

Answer

Parental cytogenetics

Answer

Thyroid profile

Answer

Antiphospholipid antibodies

Question 7

A 28-year-old obese woman presents with infertility and amenorrhea, accompanied by significant facial hair in a male distribution. Laboratory studies show increased serum LH, total serum testosterone, and dehydroepiandrosterone sulfate. What pelvic ultrasound finding would likely be observed?

Accepted Answer

Multiple small follicular cysts on the ovary

Answer

A mass resembling a bunch of grapes projecting into the vagina

Answer

Blood-filled cysts in the ovary

Answer

Fluid accumulation in the fallopian tubes

Question 8

Which of the following is NOT a major source of androgens in females?

Accepted Answer

Corpus luteum

Answer

Adrenals

Answer

Ovaries

Answer

Peripheral conversion from androgen precursors in the liver, gastrointestinal tract, and adipose tissue

Question 9

Infertility is a common feature of Swyer cell syndrome because:

Accepted Answer

There are no germ cells in this condition.

Answer

Too many Sertoli cells inhibit spermatogenesis.

Answer

Proper blood-testis barrier is not established.

Answer

Sufficient numbers of spermatozoa are not produced.

Question 10

In which of the following conditions do the ovaries function normally?

Accepted Answer

Rokitansky-Kuster-Hauser syndrome

Answer

Turner's syndrome

Answer

Androgen insensitivity syndrome

Answer

Swyer's syndrome

Reproductive Endocrinology — MCQs

Reproductive Endocrinology — MCQs

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