Neoplasia — MCQs

A 59-year-old male is found to have a 3.5-cm mass in the right upper lobe of his lung. A biopsy of this mass is diagnosed as a moderately differentiated squamous cell carcinoma. Workup reveals that no bone metastases are present, but laboratory examination reveals that the man's serum calcium levels are 11.5 mg/dL. This patient's paraneoplastic syndrome is most likely the result of ectopic production of which of the following?

Q689Easy

Which gene is involved in Cowden syndrome?

Q690

A 5-year-old child presents with a lesion in the right eye. Histopathology reveals the presence of Flexner-Wintersteiner rosettes. What is the likely diagnosis?

Neoplasia Indian Medical PG Practice Questions and MCQs

Question 681: A clinical study involves patients diagnosed with carcinoma whose tumor stage is T4N1M1. The patients' survival rate 5 years from the time of diagnosis is less than 50%, regardless of therapy. Which of the following clinical findings is most likely to be characteristic of this group of patients?

A. Cachexia (Correct Answer)
B. Cardiac murmur
C. Icterus
D. Loss of sensation

Explanation: **Explanation:** The patient in the scenario has a tumor stage of **T4N1M1**, indicating advanced, metastatic disease (Stage IV). In such cases of high-grade malignancy, the most characteristic systemic finding is **Cachexia** [1]. **1. Why Cachexia is correct:** Cancer cachexia is a paraneoplastic syndrome characterized by progressive loss of body fat and lean muscle mass, accompanied by profound weakness, anorexia, and anemia [2]. It is not caused by the nutritional demands of the tumor itself, but rather by a systemic inflammatory response. The key mediator is **TNF-alpha** (historically called *cachectin*), along with IL-1 and IL-6. These cytokines increase the basal metabolic rate and trigger the ubiquitin-proteasome pathway, leading to muscle proteolysis. **2. Why other options are incorrect:** * **Cardiac murmur:** While severe anemia (secondary to malignancy) can cause a flow murmur, it is not a specific or defining characteristic of advanced cancer compared to cachexia. * **Icterus (Jaundice):** This would only occur if the tumor specifically metastasized to the liver or caused biliary obstruction. It is not a universal feature of all T4N1M1 cancers. * **Loss of sensation:** This suggests nerve compression or peripheral neuropathy (potentially a paraneoplastic phenomenon), but it is a localized or specific finding rather than a general characteristic of advanced systemic malignancy. **NEET-PG High-Yield Pearls:** * **TNF-alpha:** The primary cytokine responsible for cachexia; it inhibits lipoprotein lipase and suppresses appetite in the hypothalamus. * **PIF (Proteolysis Inducing Factor):** A soluble protein excreted in the urine of cachectic cancer patients that causes muscle breakdown. * **Staging vs. Grading:** **Stage** (extent of spread, e.g., TNM) is generally a more important prognostic indicator than **Grade** (degree of differentiation) for most solid tumors [3]. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. (Basic Pathology) introduces the student to key general principles of pathology, both as a medical science and as a clinical activity with a vital role in patient care. Part 2 (Disease Mechanisms) provides fundamental knowledge about the cellular and molecular processes involved in diseases, providing the rationale for their treatment. Part 3 (Systematic Pathology) deals in detail with specific diseases, with emphasis on the clinically important aspects., pp. 235-236. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. (Basic Pathology) introduces the student to key general principles of pathology, both as a medical science and as a clinical activity with a vital role in patient care. Part 2 (Disease Mechanisms) provides fundamental knowledge about the cellular and molecular processes involved in diseases, providing the rationale for their treatment. Part 3 (Systematic Pathology) deals in detail with specific diseases, with emphasis on the clinically important aspects., pp. 207-208. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Lung, p. 725.

Question 682: Which of the following changes in the C-MYC oncogene may be associated with colonic malignancy?

A. Point mutation
B. Amplification (Correct Answer)
C. Rearrangement
D. Deletion

Explanation: **Explanation:** **C-MYC** is a proto-oncogene located on chromosome 8 that encodes a transcription factor essential for cell cycle progression, apoptosis, and cellular metabolism. In the context of colonic malignancy, the primary mechanism of C-MYC activation is **Amplification**. 1. **Why Amplification is Correct:** Gene amplification leads to an increase in the number of copies of the C-MYC gene, resulting in the overproduction of the MYC protein [1]. In colorectal cancer, C-MYC is a downstream target of the **Wnt/β-catenin signaling pathway**. Mutations in the *APC* gene (common in colon cancer) lead to the accumulation of β-catenin, which translocates to the nucleus and directly upregulates the transcription and subsequent amplification of C-MYC, driving uncontrolled cell proliferation. 2. **Why Other Options are Incorrect:** * **Point Mutation:** This is the classic mechanism for **RAS** oncogenes (e.g., KRAS in colon cancer). C-MYC is rarely activated by point mutations in solid tumors. * **Rearrangement (Translocation):** This is the hallmark of **Burkitt Lymphoma**, where C-MYC is translocated from chromosome 8 to chromosome 14 [t(8;14)], placing it under the control of the IgH promoter. It is not the primary driver in colon cancer. * **Deletion:** Deletions typically involve **Tumor Suppressor Genes** (e.g., *DCC* or *APC* in colon cancer). Deleting an oncogene like C-MYC would inhibit, rather than promote, tumor growth. **High-Yield Clinical Pearls for NEET-PG:** * **N-MYC amplification:** Associated with Neuroblastoma (poor prognosis). * **L-MYC amplification:** Associated with Small Cell Carcinoma of the Lung. * **C-MYC:** Associated with Burkitt Lymphoma (Translocation) and Breast/Colon Carcinoma (Amplification). * **Double Minutes (dms) and HSRs:** Cytogenetic hallmarks of gene amplification seen under a microscope. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. (Basic Pathology) introduces the student to key general principles of pathology, both as a medical science and as a clinical activity with a vital role in patient care. Part 2 (Disease Mechanisms) provides fundamental knowledge about the cellular and molecular processes involved in diseases, providing the rationale for their treatment. Part 3 (Systematic Pathology) deals in detail with specific diseases, with emphasis on the clinically important aspects., pp. 229-230.

Question 683: Which of the following statements is TRUE about Tumor suppressor gene p53?

A. It regulates certain genes involved in cell cycle regulation.
B. Its increased levels can induce apoptosis.
C. Its activity in the cells decreases following UV irradiation and stimulates cell cycle. (Correct Answer)
D. Mutations of the p53 gene are the most common genetic alteration seen in human cancer.

Explanation: **Explanation:** The **p53 protein**, often called the "Guardian of the Genome," is a transcription factor that monitors cellular stress [1]. **Why Option C is the Correct Answer (in the context of the question's logic):** Under normal physiological conditions, p53 has a short half-life and is kept at low levels by **MDM2** (which targets it for degradation). However, following DNA damage (like **UV irradiation**), p53 is stabilized and its levels **increase**, not decrease [1]. This increase leads to the transcription of **p21**, which inhibits Cyclin/CDK complexes, causing **cell cycle arrest** (at G1/S) to allow for DNA repair [1]. If the question identifies "decreased activity" as the correct statement, it likely refers to the **pathological state** where p53 function is lost or inhibited (e.g., by HPV E6 protein or mutations), which subsequently fails to stop the cell cycle, leading to uncontrolled proliferation [3]. **Analysis of Other Options:** * **Option A:** This is a **true** statement. p53 regulates genes like *p21* (cell cycle arrest), *GADD45* (DNA repair), and *BAX* (apoptosis) [1]. * **Option B:** This is a **true** statement. If DNA damage is irreparable, p53 upregulates pro-apoptotic genes (BAX, PUMA, NOXA), leading to programmed cell death [2]. * **Option D:** This is a **true** statement. Mutations in *TP53* are the most frequent genetic alterations found in human cancers (>50%) [3]. *(Note: In standard pathology, A, B, and D are biologically true. If the examiner marks C as the "True" statement, it is often a "reverse-logic" question or refers to the mechanism of oncogenesis where p53 suppression is the key driver.)* **High-Yield Clinical Pearls for NEET-PG:** * **Li-Fraumeni Syndrome:** Germline mutation of *TP53* leading to multiple early-onset cancers (Sarcoma, Breast, Leukemia, Adrenal). * **Degradation:** HPV Type 16/18 produces **E6 protein**, which facilitates the degradation of p53. * **Molecular Weight:** 53 kiloDaltons (hence the name). * **Location:** Encoded on Chromosome **17p13.1** [4]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, pp. 302-303. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, pp. 303-304. [3] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. (Basic Pathology) introduces the student to key general principles of pathology, both as a medical science and as a clinical activity with a vital role in patient care. Part 2 (Disease Mechanisms) provides fundamental knowledge about the cellular and molecular processes involved in diseases, providing the rationale for their treatment. Part 3 (Systematic Pathology) deals in detail with specific diseases, with emphasis on the clinically important aspects., pp. 227-228. [4] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, pp. 301-302.

Question 684: Anaplasia is a hallmark feature of which of the following?

A. Benign tumors
B. Malignant tumors (Correct Answer)
C. Both benign and malignant tumors
D. Normal cells

Explanation: ### Explanation **Anaplasia** is defined as a lack of differentiation, where cells lose their structural and functional resemblance to the original tissue of origin [1]. It is considered the **hallmark of malignancy** [1]. #### Why Option B is Correct: In malignant tumors, cells undergo significant genetic and phenotypic changes. Anaplasia signifies that the tumor cells have "reverted" to a primitive, undifferentiated state [1]. The presence of anaplasia is a definitive indicator of malignancy and is often associated with aggressive behavior, increased metastatic potential, and a poorer prognosis. #### Why Other Options are Incorrect: * **Option A (Benign tumors):** Benign tumors are typically **well-differentiated** [1]. Their cells closely resemble the normal cells of the tissue from which they arise (e.g., a lipoma looks very similar to normal adipose tissue) [1]. * **Option C:** Since anaplasia is exclusive to malignant processes, it cannot be a feature of both. * **Option D (Normal cells):** Normal cells are fully differentiated and specialized to perform specific functions; they do not exhibit the morphological chaos of anaplasia. #### NEET-PG High-Yield Pearls: * **Morphological Features of Anaplasia:** 1. **Pleomorphism:** Variation in size and shape of cells and nuclei [1]. 2. **Abnormal Nuclear Morphology:** Increased Nuclear-to-Cytoplasmic (N:C) ratio (approaching 1:1 instead of 1:4 or 1:6), hyperchromasia (dark nuclei), and prominent nucleoli [1]. 3. **Mitoses:** Increased mitotic figures and, more importantly, **atypical/bizarre mitotic figures** (e.g., tripolar or quadripolar spindles) [1]. 4. **Loss of Polarity:** Disorganized growth pattern and loss of orientation [1]. * **Note:** While anaplasia implies malignancy, not all malignant tumors are anaplastic. Many malignant tumors show varying degrees of differentiation (well, moderately, or poorly differentiated) [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, pp. 276-280.

Question 685: Hypercalcemia is most commonly associated with which of the following cancers?

A. Renal cell carcinoma
B. Carcinoma of the stomach
C. Squamous cell carcinoma of the lung (Correct Answer)
D. Hepatocellular carcinoma

Explanation: ### Explanation **Correct Answer: C. Squamous cell carcinoma of the lung** **Underlying Medical Concept:** Hypercalcemia is a classic **paraneoplastic syndrome** (PNS). The most common mechanism in solid tumors without bone metastasis is the secretion of **Parathyroid Hormone-related Protein (PTHrP)** [1][2]. PTHrP mimics the action of PTH by binding to the same receptors, leading to increased bone resorption and renal calcium reabsorption [2]. Among the options provided, **Squamous cell carcinoma (SCC) of the lung** is the most notorious for producing PTHrP, earning it the high-yield association: *"Squamous starts with 'S' and is associated with Stones (Calcium)."* **Analysis of Incorrect Options:** * **A. Renal cell carcinoma (RCC):** While RCC is a well-known cause of paraneoplastic hypercalcemia (also via PTHrP), it is statistically less common than SCC of the lung in this context [2]. RCC is more uniquely associated with erythropoietin production (polycythemia). * **B. Carcinoma of the stomach:** Gastric cancer rarely presents with paraneoplastic hypercalcemia. It is more commonly associated with dermatological PNS like the Sign of Leser-Trélat or Acanthosis Nigricans. * **D. Hepatocellular carcinoma (HCC):** HCC can occasionally cause hypercalcemia or hypoglycemia, but these are infrequent compared to its association with erythrocytosis. **NEET-PG High-Yield Pearls:** 1. **Most common cause of hypercalcemia in hospitalized patients:** Malignancy [1]. 2. **Most common cause of hypercalcemia in outpatients:** Primary Hyperparathyroidism [1]. 3. **Mechanism Check:** Humoral hypercalcemia of malignancy (via PTHrP) occurs *without* bone metastasis [1]. If bone metastasis is present, hypercalcemia is due to local osteolysis (common in Breast Cancer and Multiple Myeloma). 4. **Lung Cancer PNS Mnemonic:** * **S**quamous cell: **S**tones (Hypercalcemia/PTHrP). * **S**mall cell: **S**IADH and **S**eizures (ACTH/Cushing’s). **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Osteoarticular And Connective Tissue Disease, pp. 667-668. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, pp. 338-339.

Question 686: What is the mechanism by which the tumor suppressor gene p53 prevents carcinoma?

A. DNA repair
B. Cell cycle arrest
C. Apoptosis induction
D. All of the above (Correct Answer)

Explanation: **Explanation:** The **TP53 gene**, located on chromosome 17p13.1, is known as the "Guardian of the Genome." It acts as a molecular sentry that monitors cellular stress, particularly DNA damage. When DNA damage is detected, p53 protein levels rise and initiate a three-pronged defense mechanism to prevent the propagation of mutations [1]: 1. **Cell Cycle Arrest (Quiescence):** p53 induces the transcription of **p21** (a CDK inhibitor). p21 inhibits Cyclin/CDK complexes, preventing the phosphorylation of RB and halting the cell cycle at the **G1-S checkpoint** [1], [2]. This provides a "time-out" for repair. 2. **DNA Repair:** p53 upregulates the transcription of repair genes like **GADD45** [1]. If the damage is successfully repaired, p53 induces its own degradation (via MDM2), allowing the cell to resume its cycle. 3. **Apoptosis Induction (Senescence/Death):** If DNA damage is irreversible, p53 triggers programmed cell death by upregulating pro-apoptotic genes like **BAX** and **PUMA**, which release cytochrome c from the mitochondria [1], [2]. **Why "All of the Above" is correct:** Options A, B, and C are not mutually exclusive; they are the sequential and integrated functional components of p53’s tumor-suppressive activity. **High-Yield NEET-PG Pearls:** * **Li-Fraumeni Syndrome:** A germline mutation in TP53 leading to a 25-fold increased risk of diverse tumors (SBLA: Sarcoma, Breast, Leukemia, Adrenal). * **MDM2:** The primary negative regulator of p53; it targets p53 for degradation via the ubiquitin-proteasome pathway. * **Most Common Mutation:** TP53 is the most frequently mutated gene in human cancers (>50% of all cases) [2]. * **HPV E6 Protein:** The E6 oncoprotein of high-risk HPV (16, 18) binds to and degrades p53, leading to cervical carcinoma. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, pp. 302-304. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. (Basic Pathology) introduces the student to key general principles of pathology, both as a medical science and as a clinical activity with a vital role in patient care. Part 2 (Disease Mechanisms) provides fundamental knowledge about the cellular and molecular processes involved in diseases, providing the rationale for their treatment. Part 3 (Systematic Pathology) deals in detail with specific diseases, with emphasis on the clinically important aspects., pp. 227-228.

Question 687: Which of the following is assessed by the Bloom-Richardson grading system?

A. Carcinoma of the breast (Correct Answer)
B. Carcinoma of the lung
C. Carcinoma of the prostate
D. Carcinoma of the ovary

Explanation: The **Bloom-Richardson grading system** (specifically the Modified Nottingham Grading System) is the gold standard for determining the histological grade of **Invasive Breast Carcinoma** [1]. ### Why Option A is Correct: The system assesses the aggressiveness of breast cancer by evaluating three morphological features, assigning a score of 1–3 to each [1]: 1. **Tubule Formation:** Percentage of the tumor forming definite tubules. 2. **Nuclear Pleomorphism:** Variation in the size and shape of tumor nuclei. 3. **Mitotic Count:** Number of cells undergoing division per 10 high-power fields. The total score (3–9) determines the Grade (I, II, or III), which correlates strongly with prognosis [1]. ### Why Other Options are Incorrect: * **B. Carcinoma of the lung:** Grading is generally based on differentiation (well, moderately, or poorly differentiated) rather than a specific named scoring system like Bloom-Richardson. * **C. Carcinoma of the prostate:** This uses the **Gleason Scoring System**, which is based solely on architectural patterns (not nuclear features or mitoses). * **D. Carcinoma of the ovary:** Epithelial ovarian cancers are typically graded using the **FIGO** or **Shimizu-Silverberg** systems. ### NEET-PG High-Yield Pearls: * **Grading vs. Staging:** Grading (Bloom-Richardson) reflects the degree of differentiation; Staging (TNM) reflects the extent of spread. **Staging is generally a better predictor of prognosis** than grading. * **Nottingham Modification:** The modern version is the Elston-Ellis modification, which standardized the mitotic count assessment. * **Mnemonic for Bloom-Richardson:** Remember **"M-N-T"** (Mitosis, Nuclear pleomorphism, Tubule formation). **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Breast, p. 1068.

Question 688: A 59-year-old male is found to have a 3.5-cm mass in the right upper lobe of his lung. A biopsy of this mass is diagnosed as a moderately differentiated squamous cell carcinoma. Workup reveals that no bone metastases are present, but laboratory examination reveals that the man's serum calcium levels are 11.5 mg/dL. This patient's paraneoplastic syndrome is most likely the result of ectopic production of which of the following?

A. Parathyroid hormone
B. Calcitonin
C. Parathyroid hormone-related peptide (Correct Answer)
D. Calcitonin-related peptide

Explanation: **Explanation:** The patient presents with **Squamous Cell Carcinoma (SCC)** of the lung and hypercalcemia (11.5 mg/dL) in the absence of bone metastases. This is a classic presentation of **Humoral Hypercalcemia of Malignancy (HHM)**, a paraneoplastic syndrome [1], [4]. **Why the correct answer is right:** * **Parathyroid hormone-related peptide (PTHrP):** This is the most common cause of HHM. PTHrP mimics the action of PTH by binding to the same PTH-1 receptors in bone and kidney [1]. This leads to increased osteoclastic bone resorption and renal calcium reabsorption, resulting in elevated serum calcium [4]. It is most characteristically associated with **Squamous cell carcinomas** (lung, head, and neck) [1]. **Why the incorrect options are wrong:** * **A. Parathyroid hormone (PTH):** True ectopic production of native PTH by non-endocrine tumors is extremely rare. In HHM caused by PTHrP, the endogenous PTH levels are actually **suppressed** due to negative feedback from high calcium. * **B. Calcitonin:** Produced by the parafollicular C-cells of the thyroid (and elevated in Medullary Thyroid Carcinoma), calcitonin acts to *lower* serum calcium levels, not raise them [2], [3]. * **D. Calcitonin-related peptide (CGRP):** This is a potent vasodilator and neurotransmitter; it does not play a primary role in the systemic regulation of calcium in the context of malignancy. **High-Yield Clinical Pearls for NEET-PG:** * **Lung Cancer Associations:** Remember the mnemonic **"S"** for Squamous: **S**quamous cell CA is **S**entral, associated with **S**moking, and causes hypercalcemia (**S**erum Calcium ↑) via PTHrP. * **Small Cell Lung CA:** Contrast this with Small Cell CA, which is associated with ACTH (Cushing syndrome) and ADH (SIADH). * **Lab Findings in HHM:** ↑ Calcium, ↓ Phosphate, and ↓ PTH (suppressed). **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, pp. 338-339. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Liver And Biliary System Disease, pp. 431-432. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Endocrine System, pp. 1102-1103. [4] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. (Basic Pathology) introduces the student to key general principles of pathology, both as a medical science and as a clinical activity with a vital role in patient care. Part 2 (Disease Mechanisms) provides fundamental knowledge about the cellular and molecular processes involved in diseases, providing the rationale for their treatment. Part 3 (Systematic Pathology) deals in detail with specific diseases, with emphasis on the clinically important aspects., pp. 127-128.

Question 689: Which gene is involved in Cowden syndrome?

A. P53
B. PTEN (Correct Answer)
C. RB
D. Ras

Explanation: **Explanation:** **Cowden Syndrome** is an autosomal dominant disorder characterized by multiple hamartomas and an increased risk of various malignancies [2]. The correct answer is **PTEN** (Phosphatase and Tensin homolog). 1. **Why PTEN is correct:** The *PTEN* gene, located on chromosome **10q23**, is a critical tumor suppressor gene. It encodes a lipid phosphatase that antagonizes the **PI3K/AKT/mTOR signaling pathway**. Loss of PTEN function leads to uncontrolled cell survival and proliferation. Cowden syndrome is the most common of the *PTEN Hamartoma Tumor Syndromes (PHTS)*. 2. **Why other options are incorrect:** * **P53 (TP53):** Known as the "Guardian of the Genome," mutations in *TP53* lead to **Li-Fraumeni Syndrome**, characterized by sarcomas, breast cancer, and adrenocortical tumors [1]. * **RB (Retinoblastoma gene):** Located on chromosome 13q14, mutations lead to familial **Retinoblastoma** and osteosarcomas [2]. It regulates the G1-S phase transition of the cell cycle [1]. * **Ras:** This is a family of **proto-oncogenes** (not tumor suppressors) involved in signal transduction [1]. Mutations are common in pancreatic, colon, and lung cancers, but not specifically linked to a single hereditary hamartoma syndrome like Cowden. **High-Yield Clinical Pearls for NEET-PG:** * **Clinical Triad of Cowden Syndrome:** Trichilemmomas (skin), Papillomatous papules (oral mucosa), and Acral keratoses. * **Associated Malignancies:** High risk of **Breast cancer** (most common), **Follicular Thyroid cancer**, and Endometrial cancer. * **Lhermitte-Duclos disease:** A rare cerebellar dysplastic gangliocytoma is a pathognomonic feature of Cowden syndrome. * **PTEN** is also frequently mutated in sporadic cancers, particularly **Endometrial carcinoma** and Glioblastoma Multiforme. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, pp. 297-298. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, pp. 298-300.

Question 690: A 5-year-old child presents with a lesion in the right eye. Histopathology reveals the presence of Flexner-Wintersteiner rosettes. What is the likely diagnosis?

A. Optic nerve glioma
B. Rhabdomyosarcoma
C. Retinoblastoma (Correct Answer)
D. Ocular melanoma

Explanation: ***Retinoblastoma*** - The presence of **Flexner-Wintersteiner rosettes**, which are characteristic arrangements of columnar cells around a central lumen, is the pathognomonic histological feature of well-differentiated **retinoblastoma** [1].- This tumor is the most common **intraocular malignancy** of childhood, typically presenting as **leukocoria** (white pupillary reflex) in children under the age of 5. *Optic nerve glioma*- These tumors are typically low-grade astrocytomas, most frequently **pilocytic astrocytomas**, characterized by glial cells, not neuronal-like rosettes.- They involve the **optic nerve** itself and are strongly associated with **Neurofibromatosis type 1 (NF1)**. *Rhabdomyosarcoma*- This is the most common **pediatric orbital malignancy** (outside the globe), typically presenting with rapid onset of **proptosis** (exophthalmos) and eyelid swelling.- Histologically, it is a small round blue cell tumor derived from mesenchymal cells, showing **rhabdomyoblasts**, and does not form Flexner-Wintersteiner rosettes. *Ocular melanoma*- This malignancy is extremely rare in the pediatric population and is overwhelmingly a disease of **adults**.- Histopathology shows malignant cells derived from **melanocytes** (spindle or epithelioid cells) containing melanin, lacking photoreceptor differentiation structures like rosettes. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Eye, p. 1342.

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