Reproductive Endocrinology Practice Questions

Q: A woman presents with galactorrhea and amenorrhea for 1 year. What is the most probable diagnosis?

Pituitary tumor. ### Explanation The combination of **galactorrhea** (inappropriate milk secretion) and **amenorrhea** (absence of menses) is the classic clinical presentation of **hyperprolactinemia**. **1. Why Pituitary Tumor is Correct:** The most common pathological cause of persistent hyperprolactinemia is a **Prolactinoma** (a benign pituitary adenoma). Prolactin directly inhibits the pulsatile release of **GnRH** from the hypothalamus. This leads to decreased secretion of FSH and LH, resulting in hypogonadotropic hypogonadism, which manifests as amenorrhea. Simultaneously, high prolactin levels stimulate the mammary glands to produce milk, causing galactorrhea. **2. Analysis of Incorrect Options:** * **Pregnancy:** While pregnancy is the most common cause of secondary amenorrhea, it is typically associated with breast tenderness and enlargement rather than active galactorrhea during the gestation period (due to high progesterone levels inhibiting milk let-down). * **Sheehan’s Syndrome:** This involves postpartum pituitary necrosis. It typically presents with a **failure to lactate** (due to prolactin deficiency) and amenorrhea, rather than galactorrhea. * **Metastasis to Pituitary:** While possible, it is extremely rare compared to primary pituitary adenomas and usually presents with diabetes insipidus or multiple cranial nerve palsies. **3. High-Yield Clinical Pearls for NEET-PG:** * **First-line Investigation:** Serum Prolactin levels. If >200 ng/mL, it strongly suggests a prolactinoma. * **Gold Standard Imaging:** MRI with gadolinium enhancement (focused on the Sella Turcica). * **Drug of Choice:** **Cabergoline** (a dopamine agonist) is preferred over Bromocriptine due to better efficacy and fewer side effects. * **Hook Effect:** In cases of giant adenomas, extremely high prolactin levels may paradoxically show a low lab value; serial dilutions are required for diagnosis.

Q: A child presents with primary amenorrhea. She has a negative progesterone challenge test but a positive combined estrogen and progesterone test. What is the most likely diagnosis?

Prolactinoma. ### Explanation This question tests the systematic approach to primary amenorrhea using withdrawal bleeding tests. **1. Understanding the Tests:** * **Negative Progesterone Challenge Test (PCT):** No bleeding occurs after giving progesterone. This indicates either **low estrogen levels** (the endometrium was never primed) or an **outflow tract obstruction**. * **Positive Combined Estrogen-Progesterone Test:** Bleeding occurs after giving both hormones. This confirms that the **outflow tract is patent** and the **endometrium is functional**. **Why Prolactinoma is Correct:** A positive combined test localized the defect to the **Hypothalamic-Pituitary-Ovarian (HPO) axis**. A prolactinoma causes hyperprolactinemia, which inhibits GnRH secretion. This leads to low FSH/LH and subsequent **hypoestrogenism**. Because estrogen levels are too low to build the endometrium, the PCT is negative; however, since the uterus is normal, exogenous estrogen/progesterone triggers withdrawal bleeding. **2. Analysis of Incorrect Options:** * **Mullerian Agenesis:** The uterus is absent. Therefore, the combined estrogen-progesterone test would be **negative** (no endometrium to bleed). * **Asherman Syndrome:** Intrauterine synechiae (scarring) obstruct the cavity. Like Mullerian agenesis, the combined test would be **negative**. * **Polycystic Ovary Syndrome (PCOS):** PCOS is characterized by anovulation with **normal or high estrogen** levels. These patients typically have a **positive PCT**. **3. High-Yield Clinical Pearls for NEET-PG:** * **Step 1 in Amenorrhea:** Rule out pregnancy (hCG test). * **Step 2:** Progesterone Challenge (Medroxyprogesterone acetate 10mg for 5-10 days). * **Negative PCT + Positive Combined Test** = HPO Axis failure (Hypogonadotropic Hypogonadism) or Premature Ovarian Failure (Hypergonadotropic Hypogonadism). * **Negative PCT + Negative Combined Test** = Outflow tract obstruction (e.g., Asherman, Mullerian agenesis).

Q: What is a characteristic feature of the post-ovulatory endometrium observed on ultrasound?

Prominent posterior enhancement. ### Explanation The appearance of the endometrium on ultrasound changes predictably according to the phases of the menstrual cycle, driven by the fluctuating levels of estrogen and progesterone. **Correct Answer: D. Prominent posterior enhancement** In the **secretory (post-ovulatory) phase**, progesterone causes the endometrial glands to become tortuous and filled with glycogen-rich secretions. This increased vascularity and fluid content make the endometrium **hyperechoic (bright)**. Because this thickened, secretory tissue allows sound waves to pass through efficiently compared to the surrounding myometrium, it results in **posterior acoustic enhancement** (increased brightness behind the uterus). **Incorrect Options:** * **A. Single hyperechoic thin line:** This is characteristic of the **menstrual phase** or the early follicular phase, representing the collapsed endometrial cavity after shedding. * **B. Three line sign:** This is the classic appearance of the **late proliferative (pre-ovulatory) phase**. It consists of a central echogenic line (uterine cavity) and two outer echogenic lines (basalis layer), separated by hypoechoic functionalis layers. * **C. Prominent halo:** A hypoechoic subendometrial halo is often seen in the **proliferative phase** due to inner myometrial vascularity; it is not the defining feature of the post-ovulatory phase. **Clinical Pearls for NEET-PG:** * **Proliferative Phase:** Driven by Estrogen; "Triple-line" appearance; thickness usually 4–8 mm. * **Secretory Phase:** Driven by Progesterone; "Homogeneously hyperechoic" appearance; thickness usually 7–14 mm. * **Post-menopausal Endometrium:** Should ideally be ** 5 mm or bleeding occurs, a biopsy is mandatory to rule out endometrial carcinoma. * **Dating:** The "Gold Standard" for endometrial dating is the **Noyes Criteria** (histopathology), though ultrasound is the primary non-invasive tool.

Q: What is the most common ovarian cause of increased androgenic state?

Polycystic Ovarian Disease (PCOD). **Explanation:** **Polycystic Ovarian Disease (PCOD/PCOS)** is the most common cause of hyperandrogenism in women of reproductive age, accounting for approximately 70-80% of cases. The underlying pathophysiology involves a deranged LH:FSH ratio (typically >2:1 or 3:1). Elevated LH levels stimulate the **ovarian theca cells** to produce excess androgens (androstenedione and testosterone). This hyperandrogenic state leads to the classic clinical triad of hirsutism, acne, and anovulation. **Analysis of Incorrect Options:** * **Premature Adrenarche:** This refers to the early rise in adrenal androgens (DHEAS) before the onset of puberty. While it causes an increased androgenic state, it is an **adrenal** cause, not an ovarian one. * **Androgen Secreting Tumors:** (e.g., Sertoli-Leydig cell tumors) These cause a rapid, severe onset of virilization with very high testosterone levels (>200 ng/dL). While they are ovarian in origin, they are **rare** compared to the high prevalence of PCOD. * **Choriocarcinoma:** This is a gestational trophoblastic neoplasm. While it produces high levels of hCG (which can cause theca lutein cysts), its primary clinical manifestation is abnormal uterine bleeding and high β-hCG, not a primary androgenic state. **High-Yield Clinical Pearls for NEET-PG:** * **Rotterdam Criteria** for PCOS diagnosis (requires 2 out of 3): 1. Hyperandrogenism (clinical or biochemical), 2. Ovulatory dysfunction, 3. Polycystic ovaries on ultrasound ("String of pearls" appearance). * **Gold Standard** for diagnosing the source of androgens: Serum Testosterone (Ovary) vs. DHEAS (Adrenal). * **First-line treatment** for hirsutism in PCOS: Combined Oral Contraceptive Pills (OCPs).

Q: Which of the following is true regarding Savage syndrome?

Receptor defect to gonadotrophic hormones. **Savage Syndrome**, also known as **Resistant Ovary Syndrome**, is a rare cause of hypergonadotropic hypogonadism. ### **Explanation of the Correct Answer** The fundamental defect in Savage syndrome is a **resistance of the ovarian follicles to gonadotropins (FSH and LH)**. This is typically due to a **receptor defect** or a post-receptor signaling abnormality. Because the ovaries do not respond to FSH, there is no follicular development or estrogen production. The lack of negative feedback leads to a compensatory **elevation of FSH and LH** levels. ### **Analysis of Incorrect Options** * **B. Short stature:** This is a classic feature of **Turner Syndrome (45,XO)**, not Savage syndrome. Patients with Savage syndrome usually have a normal 46,XX karyotype and normal stature. * **C. Ovaries do not contain follicles:** This is the key histological differentiator. In Savage syndrome, the ovaries **do contain numerous primordial follicles**, but they fail to mature. In contrast, "Pure Gonadal Dysgenesis" or Turner syndrome is characterized by "streak ovaries" devoid of follicles. * **D. FSH is normal:** In this condition, FSH is **markedly elevated** (Hypergonadotropic) because the pituitary is trying to overcome the ovarian resistance. ### **High-Yield Clinical Pearls for NEET-PG** * **Karyotype:** Usually 46,XX (Normal female). * **Clinical Presentation:** Primary or secondary amenorrhea with normal secondary sexual characteristics. * **Diagnosis:** Requires an **ovarian biopsy** to demonstrate the presence of primordial follicles (distinguishes it from Premature Ovarian Failure/Menopause). * **Management:** Hormone Replacement Therapy (HRT) for bone health; pregnancy usually requires oocyte donation, though spontaneous remissions are rarely reported.

Q: All are true about the pathogenesis of Ovarian Hyperstimulation Syndrome, EXCEPT?

Increase in intravascular volume. **Explanation:** Ovarian Hyperstimulation Syndrome (OHSS) is a serious iatrogenic complication of ovulation induction. The hallmark of its pathogenesis is **increased capillary permeability**, not an increase in intravascular volume. **1. Why Option B is the Correct Answer (The False Statement):** In OHSS, there is a massive shift of fluid from the intravascular space into the extravascular space (third-spacing) due to leaky capillaries. This leads to **intravascular volume depletion (hypovolemia)**, hemoconcentration, and decreased organ perfusion. This can result in complications like acute kidney injury and thromboembolism. **2. Analysis of Other Options:** * **Option A:** OHSS is characterized by massive **ovarian enlargement** due to multiple follicular cysts. These ovaries become extremely **fragile** and are at high risk for torsion or rupture. * **Option C:** The primary mediator is **Vascular Endothelial Growth Factor (VEGF)**, along with cytokines like IL-6 and IL-8. These are released in response to hCG (human Chorionic Gonadotropin) and cause the characteristic increase in vascular permeability. * **Option D:** OHSS is almost exclusively **secondary to infertility treatments**, specifically following the administration of hCG (the "trigger" shot) during IVF or ovulation induction. **High-Yield Clinical Pearls for NEET-PG:** * **Trigger:** hCG is the most common trigger; OHSS rarely occurs without it. * **Clinical Features:** Ascites, pleural effusion, electrolyte imbalance, and hypercoagulability. * **Classification:** Based on Golan’s criteria (Mild, Moderate, Severe, Critical). * **Management:** Fluid resuscitation (crystalloids/albumin), thromboprophylaxis, and paracentesis if needed. Diuretics should generally be avoided as they worsen intravascular depletion.

Q: What is the sequence of development of pubertal changes in girls?

Thelarche, Pubarche, linear growth spurt, Menarche. ### Explanation The sequence of pubertal changes in girls follows a predictable chronological order driven by the activation of the Hypothalamic-Pituitary-Gonadal (HPG) axis. **1. Why Option A is Correct:** The physiological sequence is governed by increasing levels of estrogen and adrenal androgens. * **Thelarche (Breast development):** Usually the first sign of puberty (around age 8–10), triggered by rising estrogen. * **Pubarche/Adrenarche (Pubic/Axillary hair):** Follows shortly after, due to increasing adrenal androgens. * **Linear Growth Spurt:** Occurs mid-puberty. Peak height velocity in girls typically happens *before* the onset of menstruation. * **Menarche (First menstruation):** The final milestone, occurring approximately 2–2.5 years after thelarche (average age 12.5 years). **2. Why Other Options are Incorrect:** * **Options B & C:** These suggest Pubarche precedes Thelarche. While this can occur in some individuals, the standard physiological sequence taught for exams identifies Thelarche as the first event. * **Option D:** This suggests Menarche is the first event. Menarche is a late-stage pubertal event; if it occurs before breast development, it is considered pathological (e.g., precocious puberty or vaginal bleeding). **3. High-Yield Clinical Pearls for NEET-PG:** * **Mnemonic:** **T**all **P**eople **G**et **M**oney (**T**helarche → **P**ubarche → **G**rowth Spurt → **M**enarche). * **Precocious Puberty:** Development of secondary sexual characteristics before age 8. * **Delayed Puberty:** Absence of thelarche by age 13 or absence of menarche by age 15. * **Growth:** Once menarche occurs, epiphyseal closure begins due to high estrogen levels, and girls usually grow only 2–5 cm further. * **Marshall and Tanner Staging:** Used to clinically grade the progression of thelarche and pubarche (Stages 1–5).

Question 1

A woman presents with galactorrhea and amenorrhea for 1 year. What is the most probable diagnosis?

Accepted Answer

Pituitary tumor

Answer

Pregnancy

Answer

Sheehan's syndrome

Answer

Metastasis to pituitary from other carcinoma

Question 2

A 19-year-old woman presents with primary amenorrhea. Her physical examination is normal, showing female sex characteristics and breast development. The only abnormality noted is the absence of body hair. Genetic testing reveals an XY chromosome pattern. Which of the following mechanisms is most likely to explain her phenotypic pattern and amenorrhea?

Accepted Answer

Androgen receptor defect

Answer

Estrogen receptor defect

Answer

Excess hormone production

Answer

Decreased hormone production

Question 3

A child presents with primary amenorrhea. She has a negative progesterone challenge test but a positive combined estrogen and progesterone test. What is the most likely diagnosis?

Accepted Answer

Prolactinoma

Answer

Mullerian agenesis

Answer

Polycystic ovary syndrome

Answer

Asherman syndrome

Question 4

What is a characteristic feature of the post-ovulatory endometrium observed on ultrasound?

Accepted Answer

Prominent posterior enhancement

Answer

Single hyperechoic thin line

Answer

Three line sign

Answer

Prominent halo

Question 5

What is the most common ovarian cause of increased androgenic state?

Accepted Answer

Polycystic Ovarian Disease (PCOD)

Answer

Premature adrenarche

Answer

Androgen secreting tumor

Answer

Choriocarcinoma

Question 6

All of the following are true regarding precocious puberty, except:

Accepted Answer

Development of secondary sexual characteristics before the age of 6 years

Answer

Development of secondary sexual characteristics before the age of 8 years

Answer

Menstruation before the age of 10 years

Answer

The most common cause is constitutional

Question 7

Which of the following is true regarding Savage syndrome?

Accepted Answer

Receptor defect to gonadotrophic hormones

Answer

Short stature

Answer

Ovaries do not contain follicles

Answer

FSH is normal

Question 8

All are true about the pathogenesis of Ovarian Hyperstimulation Syndrome, EXCEPT?

Accepted Answer

Increase in intravascular volume

Answer

Due to ovarian enlargement and fragility

Answer

Role of VEGF and inflammatory cytokines

Answer

Secondary to infertility treatment

Question 9

What is the sequence of development of pubertal changes in girls?

Accepted Answer

Thelarche, Pubarche, linear growth spurt, Menarche

Answer

Pubarche, Thelarche, Menarche, linear growth spurt

Answer

Pubarche, Menarche, Thelarche, linear growth spurt

Answer

Menarche, Thelarche, Pubarche, linear growth spurt

Question 10

Which of the following is the most important indication for Strassman Metroplasty for a bicornuate uterus?

Accepted Answer

Repeated early pregnancy losses

Answer

Infertility

Answer

Menorrhagia

Answer

Associated vaginal atresia

Reproductive Endocrinology — MCQs

Reproductive Endocrinology — MCQs

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