Reproductive Pathology Practice Questions

Q: What is true about endodermal sinus tumors?

Schiller-Duval bodies are seen.. **Explanation:** **Endodermal Sinus Tumor (Yolk Sac Tumor)** is the most common malignant germ cell tumor in children and young adults. 1. **Why Option A is correct:** The hallmark histopathological feature of this tumor is the **Schiller-Duval body**. These are characteristic structures consisting of a central blood vessel surrounded by germ cells within a space lined by flattened cells, mimicking a primitive glomerulus. Their presence is pathognomonic for Yolk Sac Tumors. 2. **Why Option B is incorrect:** Endodermal sinus tumors are **highly malignant** and aggressive. They grow rapidly and require prompt surgical intervention followed by chemotherapy (usually the BEP regimen). 3. **Why Option C is incorrect:** This tumor is associated with elevated levels of **Alpha-fetoprotein (AFP)**, not hCG. hCG is the characteristic marker for Choriocarcinoma or some cases of Dysgerminoma. 4. **Why Option D is incorrect:** While the question asks for the *most* true statement, Option A is the definitive pathological feature. While it is seen in young individuals (children and adolescents), Option A is the classic "textbook" answer for identifying this specific pathology in exams. **High-Yield Clinical Pearls for NEET-PG:** * **Tumor Marker:** AFP is used for both diagnosis and monitoring recurrence. * **Gross Appearance:** Often presents as a large, solid, encapsulated mass with areas of hemorrhage and necrosis. * **Treatment:** Standard treatment is unilateral salpingo-oophorectomy (to preserve fertility) followed by **BEP chemotherapy** (Bleomycin, Etoposide, and Platinum/Cisplatin). * **Histology Tip:** Look for "lace-like" (reticular) patterns and intracellular/extracellular **hyaline droplets** (PAS positive) in addition to Schiller-Duval bodies.

Q: An obese woman with type 2 diabetes and hypertension is diagnosed with endometrioid type of endometrial carcinoma. What is the most probable gene defect expected in this condition?

PTEN. **Explanation:** The clinical presentation describes a classic case of **Type I Endometrial Carcinoma**. This type is estrogen-dependent, occurs in younger or perimenopausal women, and is strongly associated with the "metabolic syndrome" triad of **obesity, diabetes, and hypertension**. **1. Why PTEN is correct:** The most common genetic mutation in Type I (Endometrioid) endometrial carcinoma is the inactivation of the **PTEN tumor suppressor gene** (seen in 30–80% of cases). PTEN normally inhibits the PI3K/Akt signaling pathway; its loss leads to uncontrolled cell proliferation and survival, often preceded by atypical endometrial hyperplasia. **2. Why the other options are incorrect:** * **p53:** Mutations in the *TP53* gene are the hallmark of **Type II Endometrial Carcinoma** (e.g., Serous or Clear cell types). These occur in older, thin women, are estrogen-independent, and carry a much poorer prognosis. * **MSH2:** This is a DNA mismatch repair (MMR) gene associated with **Lynch Syndrome** (HNPCC). While Lynch syndrome increases the risk of endometrial cancer, PTEN remains the most frequent sporadic mutation in the general population presenting with the described metabolic risk factors. * **BRCA2:** Primarily associated with hereditary breast and ovarian cancer syndromes (HBOC), not typically linked to the endometrioid type of endometrial carcinoma. **High-Yield Pearls for NEET-PG:** * **Type I (Endometrioid):** Estrogen-linked, PTEN mutation, favorable prognosis, precursor is Atypical Hyperplasia. * **Type II (Serous):** Non-estrogen linked, p53 mutation, aggressive, precursor is Serous Endometrial Intraepithelial Carcinoma (SEIC). * **Most common histological type:** Endometrioid adenocarcinoma. * **Protective factors:** Combined oral contraceptives (COCs), smoking (decreases estrogen, though harmful otherwise), and multiparity.

Q: The Ki 67 antigen is a marker associated with which carcinoma?

Breast. **Explanation:** **Ki-67** is a non-histone nuclear protein that serves as a potent **proliferation marker**. It is expressed during all active phases of the cell cycle (G1, S, G2, and mitosis) but is notably absent in the resting phase (G0). 1. **Why Breast Carcinoma is Correct:** In clinical practice, Ki-67 is most significantly utilized in the management of **Breast Carcinoma** [1]. It is a key component of the **molecular subtyping** of breast cancer (specifically distinguishing between Luminal A and Luminal B types). A high Ki-67 index (>20%) indicates a highly proliferative tumor, which correlates with a poorer prognosis but often a better response to chemotherapy. It is an essential IHC (Immunohistochemistry) marker used alongside ER, PR, and HER2/neu. 2. **Why Other Options are Incorrect:** * **Stomach and Lung Carcinomas:** While Ki-67 can be expressed in any rapidly dividing cancer cell (including gastric and lung cancers), it is not used as a standard diagnostic or prognostic "signature" marker for these organs in the same way it is standardized for breast cancer. For Lung cancer, markers like TTF-1 or p40 are more specific; for Stomach, HER2 or mismatch repair (MMR) proteins are more clinically relevant. **High-Yield Clinical Pearls for NEET-PG:** * **MIB-1:** This is the most commonly used monoclonal antibody to detect the Ki-67 antigen in paraffin-embedded sections. * **Prognostic vs. Predictive:** Ki-67 is a strong **prognostic** marker (predicts the natural course of the disease). * **Neuroendocrine Tumors (NETs):** Apart from breast cancer, Ki-67 is also the gold standard for **grading** Neuroendocrine tumors (e.g., Carcinoid tumors), where the "Ki-67 index" determines if a tumor is Grade 1, 2, or 3. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Breast, pp. 1059-1066.

Q: A 26-year-old female presents with menstrual bleeding occurring 10 days prior to her usual menses. She reports her last menstrual period was heavier than usual. After a negative pregnancy test, a physician diagnoses dysfunctional uterine bleeding likely due to anovulation. If an endometrial biopsy were performed, what would be the most likely histologic appearance of the endometrium?

Proliferative endometrium with stromal breakdown. **Explanation:** The clinical presentation describes **Anovulatory Dysfunctional Uterine Bleeding (DUB)**. In anovulatory cycles, there is a failure of ovulation, meaning no corpus luteum is formed and no progesterone is produced. **1. Why Option D is Correct:** In the absence of progesterone, the endometrium remains in a continuous **proliferative phase** driven by unopposed estrogen. Without the stabilizing effect of progesterone, the endometrium thickens excessively and outgrows its blood supply. This leads to focal necrosis and irregular shedding, histologically seen as **proliferative endometrium with stromal breakdown** (evidenced by condensed stromal cells and "blue balls" of stroma). **2. Why Other Options are Incorrect:** * **Option A (Asynchronous secretory):** This is characteristic of a **Luteal Phase Defect**, where there is a lag between the glandular development and the menstrual date, but ovulation still occurs. * **Option B (Decidualized stroma):** This is seen in pregnancy or with exogenous progestin use (e.g., Mirena or OCPs). It represents a high-progesterone state. * **Option C (Early proliferative):** While the endometrium is proliferative, the presence of active bleeding (menorrhagia/metrorrhagia) specifically correlates with the "breakdown" morphology rather than a healthy, early-phase growth. **Clinical Pearls for NEET-PG:** * **Most common cause of DUB:** Anovulation (especially at extremes of age: menarche and perimenopause). * **Gold Standard for diagnosis in women >35:** Endometrial biopsy (to rule out hyperplasia/malignancy). * **Unopposed Estrogen:** Long-term anovulation increases the risk of endometrial hyperplasia and adenocarcinoma. * **Management:** First-line medical management for acute bleeding is often high-dose Estrogen or OCPs to stabilize the endometrial lining.

Q: Intratubular germ cell neoplasia (ITGCN) is most commonly seen in association with which of the following conditions?

Seminoma. **Explanation:** **Intratubular Germ Cell Neoplasia (ITGCN)**, now officially termed **Germ Cell Neoplasia In Situ (GCNIS)**, is the precursor lesion for the majority of testicular germ cell tumors (TGCTs) in adults [1]. **1. Why Seminoma is correct:** GCNIS arises from primordial germ cells that fail to differentiate and instead remain in a dormant, fetal-like state within the seminiferous tubules [1]. It is found in the adjacent parenchyma of approximately **95-100% of Seminomas** and non-seminomatous germ cell tumors (NSGCTs) in adults [1]. These tumors share the same genetic hallmark as GCNIS: **isochromosome 12p [i(12p)]**. **2. Why the other options are incorrect:** * **Pediatric Yolk Sac Tumor & Pediatric Teratoma:** These are "Type I" germ cell tumors. Unlike adult tumors, they are **not** derived from GCNIS and do not show i(12p) abnormalities [1]. They are typically benign (teratomas) or have a distinct pathogenesis in children. * **Spermatocytic Seminoma:** Now called **Spermatocytic Tumor**, this is a clinically distinct entity occurring in older men (age >50). It does **not** arise from GCNIS, is not associated with cryptorchidism, and lacks i(12p) [1]. It has an excellent prognosis and rarely metastasizes. **Clinical Pearls for NEET-PG:** * **Markers for GCNIS:** Positive for **OCT3/4, PLAP, and c-KIT (CD117)** [2]. * **Risk Factors:** Cryptorchidism (undescended testis) and Dysgenetic gonads (e.g., Swyer Syndrome) [1]. * **Exceptions:** The only germ cell tumors **NOT** associated with GCNIS are Pediatric Yolk Sac Tumors, Pediatric Teratomas, and Spermatocytic Tumors [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Lower Urinary Tract and Male Genital System, pp. 979-980. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Lower Urinary Tract and Male Genital System, pp. 980-982.

Question 1

What is true about endodermal sinus tumors?

Accepted Answer

Schiller-Duval bodies are seen.

Answer

It is a benign tumor.

Answer

It is associated with hCG.

Answer

It is seen in young individuals.

Question 2

An obese woman with type 2 diabetes and hypertension is diagnosed with endometrioid type of endometrial carcinoma. What is the most probable gene defect expected in this condition?

Accepted Answer

PTEN

Answer

p53

Answer

MSH2

Answer

BRCA2

Question 3

The Ki 67 antigen is a marker associated with which carcinoma?

Accepted Answer

Breast

Answer

Stomach

Answer

Lung

Answer

None of the above

Question 4

A 58-year-old man presents with severe back pain. His history is negative for trauma and he has no other complaints. He denies urinary frequency, hesitancy, or dysuria. A digital rectal examination confirms the presence of a firm, hard, asymmetrical, and stony prostate, suggestive of prostatic malignancy. In addition to PSA, which of the following markers can be demonstrated in the tumor cells?

Accepted Answer

AMACR

Answer

AFP

Answer

Podoplanin

Answer

OCT-3/4

Question 5

Which of the following causes orchitis without epididymitis?

Accepted Answer

Syphilis

Answer

Tuberculosis

Answer

Gonorrhoea

Answer

Chlamydia trachomatis

Question 6

A 70-year-old man presents with urinary retention and back pain. Which investigation should be performed?

Accepted Answer

Serum acid phosphatase

Answer

Serum calcium

Answer

Serum alkaline phosphatase

Answer

Serum electrophoresis

Question 7

A 26-year-old female presents with menstrual bleeding occurring 10 days prior to her usual menses. She reports her last menstrual period was heavier than usual. After a negative pregnancy test, a physician diagnoses dysfunctional uterine bleeding likely due to anovulation. If an endometrial biopsy were performed, what would be the most likely histologic appearance of the endometrium?

Accepted Answer

Proliferative endometrium with stromal breakdown

Answer

Asynchronous secretory endometrium

Answer

Decidualized stroma with inactive glands

Answer

Early proliferative endometrium

Question 8

Bilateral ovarian masses are identified on pelvic examination of a 40-year-old woman. Ultrasound examination reveals multiloculated cystic masses involving both ovaries. The patient is treated with total abdominal hysterectomy with removal of both adnexa. Pathologic examination demonstrates papillary carcinoma producing serous fluid. Which of the following tumor markers would be most useful in monitoring for recurrence?

Accepted Answer

CA-125

Answer

Alpha-fetoprotein

Answer

Bombesin

Answer

PSA

Question 9

Intratubular germ cell neoplasia (ITGCN) is most commonly seen in association with which of the following conditions?

Accepted Answer

Seminoma

Answer

Pediatric yolk sac tumor

Answer

Pediatric teratoma

Answer

Adult spermatocytic seminoma

Question 10

A 3-year-old boy presents with an abnormal mass in his scrotum. Workup demonstrates elevated levels of serum alpha-fetoprotein. What is the most likely diagnosis?

Accepted Answer

Endodermal sinus (yolk sac) tumor

Answer

Choriocarcinoma

Answer

Hepatocellular carcinoma

Answer

Teratoma

Reproductive Pathology — MCQs

Reproductive Pathology — MCQs

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