Reproductive Endocrinology Practice Questions

Q: What is the commonest cause of female pseudohermaphroditism?

Congenital adrenal hyperplasia. **Explanation:** **Female pseudohermaphroditism** (now referred to as 46,XX Disorder of Sexual Development) is characterized by a normal female genotype (46,XX) and normal ovaries, but with ambiguous or virilized external genitalia due to excess androgen exposure in utero. **Why Congenital Adrenal Hyperplasia (CAH) is correct:** CAH is the **most common cause** of female pseudohermaphroditism, accounting for approximately 90-95% of cases. It is an autosomal recessive disorder, most commonly due to **21-hydroxylase deficiency**. This enzyme defect impairs cortisol synthesis, leading to an increase in Adrenocorticotropic Hormone (ACTH). Elevated ACTH overstimulates the adrenal cortex, diverting precursors into the androgen pathway, resulting in fetal virilization. **Analysis of Incorrect Options:** * **A & C (Virilizing ovarian tumor / Exogenous androgen):** While maternal exposure to androgenic drugs or maternal androgen-secreting tumors (like Luteoma of pregnancy) can cause virilization of a female fetus, these are significantly rarer than CAH. * **B (Ovarian dysgenesis):** This (e.g., Turner Syndrome) typically presents with streak gonads and primary amenorrhea, but the external genitalia are usually normally developed female, not virilized. **NEET-PG High-Yield Pearls:** * **Most common enzyme deficiency in CAH:** 21-hydroxylase (leads to high 17-OH Progesterone). * **Prader Staging:** Used to grade the degree of virilization of external genitalia. * **Clinical Presentation:** Look for salt-wasting (hyponatremia, hyperkalemia) in the classic form. * **Internal Genitalia:** In female pseudohermaphroditism, the **Mullerian structures (uterus, tubes, upper vagina) are always present** because there is no Anti-Mullerian Hormone (AMH).

Q: A 24-year-old patient has been diagnosed with androgen-insensitivity syndrome. The patient is likely to have all of the following signs EXCEPT?

Menstruation. **Explanation:** Androgen Insensitivity Syndrome (AIS), formerly known as Testicular Feminization Syndrome, is an X-linked recessive condition where there is a mutation in the androgen receptor. This leads to a complete or partial resistance to the action of testosterone. **Why "Menstruation" is the correct answer:** In AIS, the karyotype is **46, XY**. The testes are present (usually intra-abdominal) and secrete **Anti-Müllerian Hormone (AMH)**. AMH causes the regression of Müllerian structures, meaning the patient has **no uterus, fallopian tubes, or upper third of the vagina**. Without a uterus and endometrium, menstruation is physiologically impossible. This is a classic cause of primary amenorrhea. **Analysis of Incorrect Options:** * **A. An XY chromosome complement:** This is a feature of AIS. Patients are genetically male but phenotypically female due to the inability of tissues to respond to androgens. * **C. Female external genitalia:** Since the body cannot respond to Dihydrotestosterone (DHT), the external genitalia default to the female phenotype. The vagina is typically short and blind-ending (pouch). * **D. Heterosexuality:** In medical board exams, sexual orientation is generally defined by the gender of rearing. Since these patients are raised as females and have a female gender identity, being attracted to males is classified as heterosexuality. **NEET-PG High-Yield Pearls:** * **Phenotype:** Tall stature, well-developed breasts (due to peripheral conversion of testosterone to estrogen), but **absent/scant axillary and pubic hair** (the "hairless woman"). * **Diagnosis:** High Testosterone levels, high LH, and 46, XY karyotype. * **Management:** Gonadectomy is performed **after puberty** (to allow natural breast development) to prevent gonadoblastoma/dysgerminoma. * **Differential:** Distinguish from Müllerian Agenesis (MRKH), where the karyotype is 46, XX and testosterone levels are normal.

Q: What is true about pure gonadal dysgenesis, except?

Decreased height. **Explanation:** The key to answering this question lies in differentiating **Pure Gonadal Dysgenesis (PGD)** from **Turner Syndrome (45,XO)**. 1. **Why "Decreased height" is the correct answer (the exception):** In Pure Gonadal Dysgenesis (such as **Swyer Syndrome, 46,XY** or **46,XX PGD**), patients typically have a **normal or even tall stature**. Short stature in gonadal dysgenesis is specifically linked to the loss of the **SHOX gene** located on the short arm of the X chromosome. Since patients with PGD have a normal karyotype (46,XX or 46,XY) and do not have the 45,XO chromosomal deletion, they do not exhibit the skeletal abnormalities or short stature characteristic of Turner Syndrome. 2. **Analysis of other options:** * **Dysgenetic ovaries:** By definition, gonadal dysgenesis involves the failure of the gonads to develop properly, resulting in "streak gonads" (fibrous tissue without germ cells). * **Delayed puberty & Primary amenorrhea:** Because the ovaries are dysgenetic, there is a lack of estrogen production. This leads to a failure of secondary sexual characteristic development (delayed puberty) and a failure to initiate menstruation (primary amenorrhea). **NEET-PG High-Yield Pearls:** * **Swyer Syndrome (46,XY PGD):** These patients have a female phenotype but carry a Y chromosome. They have a **high risk (approx. 25-30%) of developing gonadoblastoma**; therefore, prophylactic gonadectomy is indicated. * **Hormonal Profile:** Both Turner and PGD present with **Hypergonadotropic Hypogonadism** (High FSH/LH, Low Estrogen). * **Müllerian Structures:** In both Turner and Swyer syndrome, the uterus and fallopian tubes are **present** because there is no functional testicular tissue to produce Anti-Müllerian Hormone (AMH).

Q: What are the typical levels of sex hormone-binding globulin in Polycystic Ovary Syndrome (PCOS)?

Decreased. **Explanation:** In Polycystic Ovary Syndrome (PCOS), the level of **Sex Hormone-Binding Globulin (SHBG)** is typically **decreased**. **1. Why the correct answer (B) is right:** The primary driver for decreased SHBG in PCOS is **Hyperinsulinemia** (due to insulin resistance). High levels of insulin directly inhibit the hepatic synthesis of SHBG. Additionally, the **Hyperandrogenism** characteristic of PCOS further suppresses SHBG production in the liver. * **Clinical Consequence:** When SHBG levels fall, the "bound" fraction of testosterone decreases, leading to a significant rise in **Free Testosterone** (the biologically active form). This explains why a patient may have severe hirsutism even if their total testosterone levels are only mildly elevated. **2. Why incorrect options are wrong:** * **A. Increased:** SHBG increases in states of high estrogen (e.g., pregnancy, OCP use) or hyperthyroidism. In PCOS, the hyperinsulinemic state overrides any estrogenic effect on the liver. * **C & D. Unchanged/Variable:** SHBG reduction is a consistent biochemical hallmark of PCOS and serves as a key link between metabolic dysfunction and clinical hyperandrogenism. **High-Yield Clinical Pearls for NEET-PG:** * **The "Vicious Cycle":** Low SHBG → ↑ Free Androgens → ↑ Abdominal Adiposity → ↑ Insulin Resistance → ↓ SHBG. * **Diagnostic Utility:** The **Free Androgen Index (FAI)**, calculated as *(Total Testosterone / SHBG) x 100*, is a more sensitive marker for PCOS than total testosterone alone. * **Treatment Effect:** Combined Oral Contraceptive Pills (COCPs) are used in PCOS because the estrogen component **increases SHBG**, thereby lowering free testosterone and improving hirsutism.

Q: Watery nature of the cervical mucus at the time of ovulation may be caused by:

Estrogen. **Explanation:** The characteristics of cervical mucus are primarily regulated by the fluctuating levels of ovarian steroids during the menstrual cycle. **1. Why Estrogen is Correct:** During the follicular phase, rising levels of **Estrogen** (peaking just before ovulation) act on the endocervical glands to produce **Type E (Estrogenic) mucus**. This mucus is characterized by being **watery, profuse, clear, and alkaline**. Its low viscosity and high water content facilitate the penetration and transport of sperm. Under the influence of estrogen, the mucus also exhibits high **spinnbarkeit** (elasticity) and a characteristic **ferning pattern** on microscopy due to increased sodium chloride concentration. **2. Why Other Options are Incorrect:** * **Progesterone:** Dominant during the luteal phase, progesterone antagonizes estrogen's effects. It produces **Type G (Gestogenic) mucus**, which is thick, opaque, viscid, and cellular. This forms a "mucus plug" that is impenetrable to sperm. * **Infection:** Inflammatory conditions (like cervicitis) typically result in purulent, thick, or malodorous discharge containing leukocytes, which is the opposite of the clear, watery mucus seen at ovulation. **NEET-PG High-Yield Pearls:** * **Spinnbarkeit Test:** Measures the elasticity of cervical mucus. At ovulation, it can be stretched 8–12 cm. * **Ferning (Arborization):** A result of crystallization of NaCl. It is maximal at ovulation and disappears after progesterone takes over (around day 21). * **Insler Score:** A clinical scoring system used to assess cervical mucus (volume, spinnbarkeit, ferning, and cervical os opening) to predict the timing of ovulation.

Q: Polycystic ovarian disease is associated with which of the following conditions?

Endometrial carcinoma. **Explanation:** Polycystic Ovarian Syndrome (PCOS) is characterized by chronic anovulation, which leads to a state of **unopposed estrogen**. In a normal menstrual cycle, ovulation is followed by the production of progesterone, which stabilizes and eventually sheds the endometrium. In PCOS, the lack of ovulation means progesterone is not produced, leaving the endometrium exposed to continuous estrogenic stimulation. This results in endometrial hyperplasia, which significantly increases the long-term risk of **Endometrial Carcinoma** (specifically Type I, endometrioid adenocarcinoma). **Analysis of Options:** * **A. Ovarian cancer:** While some studies suggest a marginal increase in risk, the association is not as strong or direct as that with endometrial cancer. In fact, the use of Combined Oral Contraceptive Pills (COCPs) to treat PCOS actually *reduces* the risk of ovarian cancer. * **C. Congenital adrenal hyperplasia (CAH):** Non-classic CAH is a **differential diagnosis** for PCOS (as it presents with similar hyperandrogenism), but it is not caused by or "associated" with PCOS as a complication. * **D. Vaginal carcinoma:** There is no known pathophysiological link between PCOS and vaginal malignancy. **NEET-PG High-Yield Pearls:** * **The "PCOS Triad":** Hyperandrogenism, Ovulatory dysfunction, and Polycystic ovaries on ultrasound (Rotterdam Criteria). * **Metabolic Risks:** PCOS is strongly associated with Insulin Resistance, Type 2 Diabetes Mellitus, and Metabolic Syndrome. * **LH:FSH Ratio:** Classically >2:1 or 3:1 (though no longer a primary diagnostic criterion). * **Protective Factor:** Cyclic progestogens or COCPs are prescribed in PCOS specifically to induce withdrawal bleeds and protect the endometrium from hyperplasia.

Q: What is the Spinnbarkeit phenomenon?

Elasticity of cervical mucus. **Explanation:** The **Spinnbarkeit phenomenon** refers to the elasticity or "stretchability" of cervical mucus. This physiological change is a hallmark of the **periovulatory phase** (late follicular phase) of the menstrual cycle. **1. Why Option A is correct:** Under the influence of peak **estrogen** levels just before ovulation, the cervical mucus becomes thin, clear, watery, and highly elastic. This elasticity allows the mucus to be stretched into a long thread (usually 8–12 cm) between two glass slides or fingers. This change facilitates sperm penetration and survival, serving as a clinical marker for the "fertile window." **2. Why the other options are incorrect:** * **Option B:** Clue cells are epithelial cells covered with bacteria (*Gardnerella vaginalis*), a diagnostic feature of **Bacterial Vaginosis**, not a property of mucus elasticity. * **Option C:** Vaginal secretions with numerous leukocytes indicate an inflammatory or infectious process (e.g., Trichomoniasis or Cervicitis), whereas ovulatory mucus is typically acellular. * **Option D:** The Spinnbarkeit phenomenon is **estrogen-dependent**. Progesterone, dominant in the luteal phase, makes the mucus thick, tacky, and non-elastic, effectively "plugging" the cervix. **3. High-Yield Clinical Pearls for NEET-PG:** * **Ferning Pattern:** Estrogen causes the crystallization of sodium chloride in cervical mucus, creating a "fern-like" pattern under the microscope. * **Insler Score:** A clinical scoring system (0-12) used to assess the quality of cervical mucus (volume, Spinnbarkeit, ferning, and cervical os appearance) to predict ovulation. * **Progesterone Effect:** Post-ovulation, the mucus becomes thick (low Spinnbarkeit) and loses the ferning pattern, which is a sign that ovulation has occurred.

Question 1

What is the commonest cause of female pseudohermaphroditism?

Accepted Answer

Congenital adrenal hyperplasia

Answer

Virilizing ovarian tumor

Answer

Ovarian dysgenesis

Answer

Exogenous androgen

Question 2

A 24-year-old patient has been diagnosed with androgen-insensitivity syndrome. The patient is likely to have all of the following signs EXCEPT?

Accepted Answer

Menstruation

Answer

An XY chromosome complement

Answer

Female external genitalia

Answer

Heterosexuality

Question 3

Which of the following conditions does not present with both Mullerian and Wolffian duct structures?

Accepted Answer

FSH receptor mutation

Answer

Antimullerian hormone deficiency

Answer

Ovo-testicular syndrome

Answer

Mixed gonadal dysgenesis

Question 4

What is true about pure gonadal dysgenesis, except?

Accepted Answer

Decreased height

Answer

Dysgenetic ovaries

Answer

Delayed puberty

Answer

Primary amenorrhea

Question 5

What are the typical levels of sex hormone-binding globulin in Polycystic Ovary Syndrome (PCOS)?

Accepted Answer

Decreased

Answer

Increased

Answer

Unchanged

Answer

Variable

Question 6

Watery nature of the cervical mucus at the time of ovulation may be caused by:

Accepted Answer

Estrogen

Answer

Progesterone

Answer

Infection

Answer

All of the above

Question 7

Polycystic ovarian disease is associated with which of the following conditions?

Accepted Answer

Endometrial carcinoma

Answer

Ovarian cancer

Answer

Congenital adrenal hyperplasia

Answer

Vaginal carcinoma

Question 8

A 22-year-old obese woman presents with facial acne and hirsutism. Her serum LH level is 36 mIU/mL and FSH is 9 mIU/mL. Androstenedione and testosterone levels are mildly elevated, but serum DHEAS is normal. The patient does not wish to conceive at this time. Which of the following is the most appropriate treatment for her condition?

Accepted Answer

Oral contraceptive pills

Answer

Corticosteroids

Answer

GnRH analog

Answer

Wedge resection of ovary

Question 9

What is the Spinnbarkeit phenomenon?

Accepted Answer

Elasticity of cervical mucus

Answer

Clue cells of cervical mucosa

Answer

Vaginal secretions with numerous leucocytes

Answer

Dependent on serum progesterone

Question 10

A baby girl presents with bilateral inguinal masses, which are found to be testes in the inguinal canals. Which karyotype would you expect to find in the child?

Accepted Answer

46, XY

Answer

46, XX

Answer

47, XXY

Answer

47, XYY

Reproductive Endocrinology — MCQs

Reproductive Endocrinology — MCQs

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