Neoplasia — MCQs

Neoplasia Indian Medical PG Practice Questions and MCQs

Question 331: Which of the following childhood tumors most frequently metastasizes to the bone?

A. Neuroblastoma (Correct Answer)
B. Ganglioneuroma
C. Wilms' tumor
D. Ewing's sarcoma

Explanation: **Explanation:** **Neuroblastoma** is the most common extracranial solid tumor of childhood [1]. It is notorious for its early and widespread hematogenous metastasis. Approximately 60-70% of patients present with metastatic disease at diagnosis. The most frequent site of metastasis is the **bone (specifically the skull and orbit)** and bone marrow. A classic clinical presentation is "Proptosis and Periorbital Ecchymosis" (Raccoon eyes) due to orbital bone metastasis [1]. **Analysis of Options:** * **A. Neuroblastoma (Correct):** Derived from neural crest cells, it frequently spreads to the cortical bone and bone marrow [1]. It is the most common cause of bone metastasis in children. * **B. Ganglioneuroma:** This is the benign, mature counterpart of neuroblastoma. It is well-differentiated and does not metastasize [1]. * **C. Wilms’ Tumor (Nephroblastoma):** While it is the most common childhood renal tumor [1], it primarily metastasizes to the **lungs**. Bone metastasis is extremely rare in Wilms' tumor (unlike Clear Cell Sarcoma of the Kidney, which is known as the "bone-seeking" renal tumor). * **D. Ewing’s Sarcoma:** This is a primary bone tumor [1]. While it can metastasize to other bones, it is the *source* rather than a tumor that "most frequently" chooses bone as its metastatic destination compared to the systemic spread of Neuroblastoma. **NEET-PG High-Yield Pearls:** * **Homer-Wright Rosettes:** Characteristic histological finding in Neuroblastoma (also seen in Medulloblastoma) [1]. * **Urinary Markers:** Elevated VMA (Vanillylmandelic acid) and HVA (Homovanillic acid) due to catecholamine production [1]. * **N-myc Amplification:** The most important prognostic indicator (indicates poor prognosis) [1]. * **Pepper Syndrome:** Massive hepatomegaly due to neuroblastoma metastasis [1]. * **Blueberry Muffin Baby:** Cutaneous metastases presenting as bluish nodules [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of Infancy and Childhood, pp. 483-487.

Question 332: Thorium dioxide is known to cause which of the following malignancies?

A. Lymphoma
B. Lymphangiosarcoma
C. Angiosarcoma (Correct Answer)
D. Hemangioendothelioma

Explanation: **Explanation:** **Thorium dioxide (Thorotrast)** is a radioactive contrast medium used historically in radiology (1930s–1950s). It is the classic etiological agent associated with **Angiosarcoma of the liver** [1]. 1. **Why Angiosarcoma is correct:** Thorotrast has an extremely long biological half-life (several decades) and emits alpha particles [1]. It is sequestered by the Reticuloendothelial System (RES), primarily in the liver, spleen, and bone marrow. Chronic alpha-particle radiation leads to DNA damage and malignant transformation of the sinusoidal endothelial cells in the liver, resulting in Angiosarcoma—a highly aggressive vascular tumor [1]. 2. **Why other options are incorrect:** * **Lymphoma:** While radiation can increase the risk of certain hematological malignancies, Thorotrast is specifically linked to solid organ tumors (liver, bile duct) rather than lymphoid tissue. * **Lymphangiosarcoma:** This is a malignant tumor of lymphatic vessels, most commonly seen in the arm following radical mastectomy and chronic lymphedema (Stewart-Treves Syndrome), not chemical or radioactive exposure. * **Hemangioendothelioma:** This is a vascular tumor of intermediate malignancy (between hemangioma and angiosarcoma). While it occurs in the liver, it is not the classic malignancy associated with Thorotrast exposure. **High-Yield Clinical Pearls for NEET-PG:** * **Other Risk Factors for Hepatic Angiosarcoma:** Vinyl Chloride monomer (PVC industry workers) and Arsenic (pesticides/Fowler’s solution). * **Latent Period:** Thorotrast-induced malignancies typically appear 20–30 years after exposure. * **Other Thorotrast-linked tumors:** Cholangiocarcinoma and Hepatocellular Carcinoma (HCC). * **Radiological sign:** On X-ray/CT, Thorotrast appears as persistent, opacified branching patterns in the liver and spleen due to its radio-opacity and lifelong retention [1]. **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. 216-217.

Question 333: Which of the following can be a complication of a dentigerous cyst?

A. Ameloblastoma
B. Mucoepidermoid carcinoma
C. Squamous cell carcinoma
D. All of the above (Correct Answer)

Explanation: A **dentigerous cyst** (follicular cyst) is the most common developmental odontogenic cyst, arising from the follicle of an unerupted tooth (most commonly the mandibular third molar). It is characterized by a lining of non-keratinized stratified squamous epithelium derived from the reduced enamel epithelium [1]. **Explanation of the Correct Answer:** The correct answer is **D (All of the above)** because the epithelial lining of a dentigerous cyst possesses multipotentiality, meaning it can undergo neoplastic transformation into several types of tumors: 1. **Ameloblastoma:** This is the most common neoplastic complication. Approximately 15-17% of ameloblastomas arise within the wall of a pre-existing dentigerous cyst (unicystic ameloblastoma) [1]. 2. **Squamous Cell Carcinoma (SCC):** Chronic inflammation or unknown triggers can cause the epithelial lining to undergo malignant transformation into a primary intraosseous squamous cell carcinoma. 3. **Mucoepidermoid Carcinoma:** The lining of the cyst often contains mucous-secreting cells (prosoplasia). These cells can undergo malignant transformation into mucoepidermoid carcinoma, a salivary gland-type tumor occurring within the jaw. **Clinical Pearls for NEET-PG:** * **Radiological Hallmark:** Appears as a well-defined unilocular radiolucency attached to the **cemento-enamel junction (CEJ)** of an unerupted tooth. * **Most Common Site:** Mandibular 3rd molars > Maxillary canines. * **Histopathology:** Lining is typically 2–4 layers of flattened non-keratinized cells. The presence of **Rushton bodies** (linear/curved calcifications) is a characteristic finding. * **Management:** Enucleation is the treatment of choice; however, the specimen must be sent for histopathology to rule out the aforementioned neoplastic changes. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Head and Neck, pp. 741-742.

Question 334: Which of the following markers is not typically expressed by neuroendocrine tumors?

A. Synaptophysin
B. Chromogranin
C. CD56
D. CK7 (Correct Answer)

Explanation: **Explanation:** Neuroendocrine tumors (NETs) are a diverse group of neoplasms derived from cells of the diffuse neuroendocrine system [1]. These cells are characterized by the presence of neurosecretory granules, which express specific proteins used as diagnostic immunohistochemical (IHC) markers. **Why CK7 is the correct answer:** **CK7 (Cytokeratin 7)** is a low-molecular-weight intermediate filament typically expressed by **epithelial cells**, specifically those of glandular origin (e.g., lung, breast, and upper GI tract). While some NETs may show focal positivity for broad-spectrum keratins, CK7 is not a specific or typical marker for neuroendocrine differentiation. Its presence usually points toward an adenocarcinoma rather than a pure neuroendocrine lineage. **Analysis of Incorrect Options:** * **Synaptophysin (Option A):** This is a glycoprotein found in the membrane of presynaptic vesicles. It is considered the **most sensitive** marker for neuroendocrine differentiation. * **Chromogranin (Option B):** Specifically Chromogranin A, this is found within the matrix of neurosecretory granules [2]. It is the **most specific** marker for NETs, though its expression may be low in poorly differentiated tumors (like small cell carcinoma). * **CD56 (Option C):** Also known as Neural Cell Adhesion Molecule (NCAM), it is frequently expressed in neuroendocrine tumors, as well as NK cells and certain neurons. **High-Yield NEET-PG Pearls:** * **Best Screening Marker:** Synaptophysin (High sensitivity). * **Best Confirmatory Marker:** Chromogranin A (High specificity). * **NSE (Neuron-Specific Enolase):** Another marker for NETs, but it is the least specific. * **Ki-67 Index:** Crucial for grading NETs (especially G1, G2, and G3 categories in the GI tract and pancreas). * **Salt and Pepper Chromatin:** The classic histological description of neuroendocrine nuclei [2]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, pp. 780-781. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, pp. 781-782.

Question 335: Which of the following neoplasms is generally considered radioresistant?

A. Ewing's sarcoma
B. Lymphoma
C. Seminoma testis
D. Osteosarcoma (Correct Answer)

Explanation: **Explanation:** The radiosensitivity of a tumor is primarily determined by its cell of origin, growth fraction, and inherent DNA repair mechanisms. **Why Osteosarcoma is the Correct Answer:** **Osteosarcoma** is a primary malignant bone tumor characterized by the production of osteoid [1]. It is classically categorized as **radioresistant**. The tumor cells possess robust DNA repair mechanisms and often have a low growth fraction in certain areas, making ionizing radiation ineffective as a primary treatment modality. Consequently, the standard of care is surgical resection (limb-salvage or amputation) combined with systemic chemotherapy, rather than radiotherapy [1]. **Analysis of Incorrect Options:** * **Ewing’s Sarcoma:** Unlike most bone sarcomas, Ewing’s is highly **radiosensitive**. While surgery and chemotherapy are preferred, radiotherapy is a viable local control measure if the tumor is unresectable [2]. * **Lymphoma:** Lymphocytes are among the most radiosensitive cells in the body. Both Hodgkin and Non-Hodgkin lymphomas respond dramatically to low doses of radiation. * **Seminoma Testis:** This is the "classic" example of a highly **radiosensitive** solid tumor. Even metastatic seminoma can often be cured or significantly debulked using radiotherapy. **NEET-PG High-Yield Pearls:** * **Highly Radiosensitive Tumors:** Dysgerminoma, Seminoma, Lymphoma, Ewing’s Sarcoma, and Wilms’ tumor. * **Radioresistant Tumors:** Osteosarcoma, Malignant Melanoma, Renal Cell Carcinoma (RCC), and Pancreatic Adenocarcinoma. * **Bergonie-Tribondeau Law:** States that radiosensitivity is directly proportional to the reproductive activity (mitotic rate) and inversely proportional to the degree of differentiation of the cells. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Osteoarticular And Connective Tissue Disease, pp. 673-674. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Osteoarticular And Connective Tissue Disease, pp. 671-672.

Question 336: Gleason's classification is used for which of the following conditions?

A. Carcinoma of the breast
B. Carcinoma of the prostate (Correct Answer)
C. Carcinoma of the pancreas
D. Carcinoma of the rectum

Explanation: **Explanation:** The **Gleason Grading System** is the gold standard for determining the prognosis of **Prostate Adenocarcinoma** [1]. Unlike many other grading systems that rely on nuclear atypia, the Gleason system is based solely on the **architectural patterns** of the tumor cells. **Why Option B is Correct:** The Gleason score is calculated by identifying the most prevalent (primary) architectural pattern and the second most prevalent (secondary) pattern. Each is assigned a grade from 1 to 5. * **Grade 1:** Small, uniform glands (well-differentiated). * **Grade 5:** Lack of gland formation, showing sheets of cells or nests (poorly differentiated). * **Gleason Score:** The sum of the two grades (e.g., 3+4=7). A higher score indicates a more aggressive tumor and a poorer prognosis [1]. **Why Other Options are Incorrect:** * **A. Carcinoma of the breast:** Uses the **Nottingham Grading System** (Scarff-Bloom-Richardson scale), which evaluates tubule formation, nuclear pleomorphism, and mitotic count. * **C. Carcinoma of the pancreas:** Generally graded based on the degree of glandular differentiation (Well, Moderate, or Poorly differentiated) without a specific named eponymous system like Gleason. * **D. Carcinoma of the rectum:** Primarily uses the **TNM staging** and the **Astler-Coller modification of Dukes’ classification** for prognosis. **High-Yield Clinical Pearls for NEET-PG:** * **Modified Gleason System:** Currently, the "Grade Group" system (1–5) is used to further simplify the Gleason score (e.g., Grade Group 1 = Gleason ≤6). * **Most common site:** Prostate cancer typically arises in the **peripheral zone** [1]. * **Tumor Marker:** **PSA (Prostate Specific Antigen)** is used for screening and monitoring, but the Gleason score is the best predictor of biological behavior [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. 993-994.

Question 337: The retinoblastoma gene is located on which chromosome?

A. 13 (Correct Answer)
B. 14
C. 17
D. 22

Explanation: The **RB1 gene** (Retinoblastoma gene) is a critical tumor suppressor gene located on the **long arm of chromosome 13 (13q14)** [1], [2]. It encodes the pRB protein, which acts as a "molecular brake" on the cell cycle. pRB prevents the cell from progressing from the G1 to the S phase by binding and inhibiting the **E2F transcription factor** [1], [3]. When pRB is phosphorylated by Cyclin D-CDK4/6 complexes, it releases E2F, allowing DNA synthesis to proceed. **Analysis of Options:** * **Option A (13): Correct.** The RB1 gene is located at 13q14 [1]. Mutations or deletions here lead to Retinoblastoma and increase the risk of Osteosarcoma. * **Option B (14):** This chromosome is associated with the **Immunoglobulin Heavy Chain (IgH)** locus. Translocations involving 14q32 are common in B-cell lymphomas (e.g., Follicular lymphoma t(14;18) and Burkitt lymphoma t(8;14)). * **Option C (17):** This is the location of the **TP53 gene** (17p13.1), the "guardian of the genome," and the **NF1 gene** (17q11) [2]. * **Option D (22):** This chromosome houses the **NF2 gene** (Merlin) and is involved in the Philadelphia chromosome **t(9;22)** seen in CML. **High-Yield Clinical Pearls for NEET-PG:** 1. **Knudson’s "Two-Hit" Hypothesis:** Developed based on RB1; both alleles must be inactivated for tumor formation [1], [2]. 2. **Familial vs. Sporadic:** Familial cases are usually bilateral and carry a high risk of secondary tumors (especially **Osteosarcoma**). Sporadic cases are typically unilateral [1]. 3. **Microscopic Hallmark:** Presence of **Flexner-Wintersteiner rosettes** (lumen-containing) is highly characteristic of Retinoblastoma. 4. **Viral Inactivation:** The E7 protein of High-risk HPV (16, 18) binds and inactivates pRB, leading to cervical cancer. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, p. 300. [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. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, pp. 297-298.

Question 338: What is CD 99 typically associated with?

A. Ewing's sarcoma (Correct Answer)
B. Small lymphocytic lymphoma (SLL)
C. Dermatofibroma
D. Malignant histiocytic fibroma

Explanation: **Explanation:** **CD99 (MIC2 gene product)** is a 32-kDa transmembrane glycoprotein that is highly characteristic of the **Ewing Sarcoma Family of Tumors (ESFT)**. In Ewing’s sarcoma, CD99 typically shows a strong, diffuse, and continuous **membranous staining** pattern. While not 100% specific, it is a highly sensitive marker used to differentiate Ewing’s sarcoma from other small round blue cell tumors. **Analysis of Options:** * **Option A (Correct):** Ewing’s sarcoma is characterized by the translocation **t(11;22)(q24;q12)**, leading to the EWS-FLI1 fusion gene. CD99 expression is the gold standard immunohistochemical marker for its diagnosis. * **Option B (Incorrect):** Small Lymphocytic Lymphoma (SLL) is a B-cell neoplasm characterized by markers such as **CD5, CD19, CD20, and CD23**. It is typically CD99 negative. * **Option C (Incorrect):** Dermatofibroma is a benign fibrous histiocytoma of the skin. Its classic IHC marker is **Factor XIIIa**, and it is typically negative for CD34 (unlike Dermatofibrosarcoma Protuberans). * **Option D (Incorrect):** Malignant Fibrous Histiocytoma (now largely reclassified as Undifferentiated Pleomorphic Sarcoma) shows non-specific staining and is not associated with CD99. **High-Yield Clinical Pearls for NEET-PG:** * **CD99 Pattern:** Must be **membranous** to be significant for Ewing's. * **Other CD99+ conditions:** Lymphoblastic lymphoma, Synovial sarcoma, and Solitary Fibrous Tumor (SFT) can occasionally show positivity. * **Ewing’s Sarcoma Triad:** 1. Onion-skin periosteal reaction (X-ray); 2. Small round blue cells with Homer-Wright rosettes (Histology); 3. CD99 positivity (IHC).

Question 339: The adenoma-carcinoma sequence was prototypically observed in which carcinoma?

A. Colon (Correct Answer)
B. Gastric
C. Salivary gland
D. Lacrimal gland

Explanation: **Explanation:** The **adenoma-carcinoma sequence** refers to the stepwise progression of normal epithelial cells to invasive cancer through a series of well-defined genetic mutations and morphological changes [1]. **1. Why Colon is correct:** The colon is the classic site where this sequence was first described (by Fearon and Vogelstein). It involves a predictable progression [2]: * **Normal Mucosa → Adenoma:** Driven by the loss or mutation of the **APC tumor suppressor gene** (the "gatekeeper" mutation) [3]. * **Adenoma Growth/Dysplasia:** Driven by **K-RAS** mutations [3]. * **Adenoma → Carcinoma:** Driven by the loss of **TP53** and **SMAD4** [2]. This model explains why screening colonoscopies and the removal of precursor polyps (adenomas) can effectively prevent colorectal cancer [4]. **2. Why other options are incorrect:** * **Gastric Carcinoma:** While it follows a sequence (Chronic gastritis → Atrophy → Intestinal metaplasia → Dysplasia → Cancer), it is primarily associated with *H. pylori* infection and the **Correa pathway**, rather than the classic adenoma-carcinoma model. * **Salivary and Lacrimal Glands:** These tumors (like Pleomorphic Adenoma) rarely undergo malignant transformation. When they do (e.g., Carcinoma ex pleomorphic adenoma), the genetic pathway is distinct and does not follow the classic Vogelstein model. **High-Yield Clinical Pearls for NEET-PG:** * **Gatekeeper Mutation:** APC gene (Chromosome 5q21) [4]. * **Microsatellite Instability (MSI) Pathway:** An alternative pathway for colon cancer involving DNA mismatch repair genes (MLH1, MSH2), often seen in Lynch Syndrome [5]. * **Size Matters:** Adenomas >2 cm have a 50% risk of harboring malignancy [3]. * **Morphology:** Villous adenomas have a higher malignant potential than tubular adenomas ("Villous is Villainous"). **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. 224-225. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Alimentary System Disease, pp. 373-374. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, p. 819. [4] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, pp. 821-822. [5] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, p. 817.

Question 340: What is the most common second malignancy in patients with familial retinoblastoma?

A. Teratoma
B. Medullary carcinoma
C. Osteosarcoma (Correct Answer)
D. Malignant melanoma

Explanation: **Explanation:** The correct answer is **C. Osteosarcoma**. **Underlying Concept:** Retinoblastoma is caused by a mutation in the **RB1 gene** (a tumor suppressor gene) located on chromosome **13q14** [1]. In the **familial (hereditary) form**, patients inherit one defective copy of the RB1 gene in all somatic cells (germline mutation) [2]. According to Knudson’s "Two-Hit Hypothesis," a second somatic mutation leads to retinoblastoma [1]. Because the RB1 mutation is present in every cell of the body, these patients are predisposed to other neoplasms later in life. **Osteosarcoma** is the most common radiogenic and spontaneous second primary malignancy in these survivors, followed by soft tissue sarcomas and pinealoblastoma (trilateral retinoblastoma). **Analysis of Incorrect Options:** * **A. Teratoma:** These are germ cell tumors and are not associated with the RB1 pathway or familial retinoblastoma. * **B. Medullary carcinoma:** This is a thyroid malignancy associated with **RET proto-oncogene** mutations (MEN 2A and 2B syndromes), not RB1. * **D. Malignant melanoma:** While survivors of familial retinoblastoma have a slightly increased risk of melanoma, it is significantly less common than osteosarcoma [3]. **High-Yield Clinical Pearls for NEET-PG:** * **RB1 Function:** The RB protein controls the **G1 to S phase** transition of the cell cycle by binding and inhibiting the **E2F transcription factor** [4]. * **Two-Hit Hypothesis:** Familial cases are usually bilateral and multifocal; sporadic cases are typically unilateral and unifocal [2]. * **Flexner-Wintersteiner Rosettes:** These are pathognomonic histological features of retinoblastoma (clusters of cuboidal cells around a central lumen) [3]. * **Trilateral Retinoblastoma:** Bilateral retinoblastoma associated with a pineal tumor (pinealoblastoma). **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, p. 300. [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. [3] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Manifestations Of Central And Peripheral Nervous System Disease, pp. 737-738. [4] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, pp. 297-298.

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