Neoplasia — MCQs

A 70-year-old man has smoked for years despite a chronic productive cough. He notices blood in his sputum and sees his physician. A chest x-ray reveals a mass in the left lung, which is biopsied during a fiberoptic bronchoscopy. Assuming that this patient's cancer is etiologically related to his smoking, which of the following diagnoses are most likely to be returned by the pathology laboratory?

Q659Medium

A 59-year-old man complains of progressive weakness and very dark stools. Physical examination demonstrates fullness in the right lower quadrant. Laboratory studies show iron deficiency anemia (serum hemoglobin 7.4 g/dL) and positive occult blood in stool specimens. Colonoscopy discloses an ulcerating lesion of the cecum. Which of the following serum tumor markers is most likely to be useful for monitoring this patient after surgery?

Q660Medium

All are true about salivary gland tumors except:

Neoplasia Indian Medical PG Practice Questions and MCQs

Question 651: Which of the following is an antibody against tumor cells?

A. MHC-I (Correct Answer)
B. MHC-II
C. Anti-viral
D. Differentiated antigen

Explanation: **Explanation:** In the context of tumor immunology, the immune system recognizes tumor cells primarily through the presentation of **Tumor-Associated Antigens (TAAs)**. [1] **Why MHC-I is the correct answer:** Cytotoxic T Lymphocytes (CD8+ T cells) are the primary immune cells responsible for anti-tumor immunity. For these T cells to recognize and kill a tumor cell, the tumor antigens must be presented on the cell surface. **MHC Class I molecules** are expressed on all nucleated cells and serve as the "display windows" that present intracellular tumor proteins to CD8+ T cells. [1], [2] Without MHC-I, the immune system cannot "see" the tumor cell. Interestingly, many tumors downregulate MHC-I expression as an immune-evasion mechanism. [1] **Analysis of Incorrect Options:** * **MHC-II:** These molecules are primarily expressed on professional **Antigen-Presenting Cells (APCs)** like macrophages and B cells. [2], [3] They present exogenous antigens to CD4+ Helper T cells, rather than being the direct target or primary recognition molecule on the tumor cell itself. [3] * **Anti-viral:** While some tumors are caused by viruses (e.g., HPV, EBV), "anti-viral" refers to a broad category of drugs or immune responses against viral particles, not a specific molecule used by the immune system to identify tumor cells. * **Differentiated antigen:** These are molecules expressed by specific lineages (e.g., PSA in prostate tissue). While they can be used as tumor markers, they are not the primary mechanism of immune recognition in the way MHC-I facilitates T-cell mediated killing. **NEET-PG Clinical Pearls:** * **CD8+ T cells** are the most important cells for anti-tumor immunity. * **NK Cells** kill tumor cells that have *downregulated* MHC-I (the "missing self" hypothesis). * **Immune Evasion:** Tumors evade the immune system by losing MHC expression or expressing inhibitory molecules like **PD-L1**. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, pp. 318-319. [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. 156-157. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of the Immune System, pp. 202-203.

Question 652: Which of the following neoplasms is not typically seen in children?

A. Neuroblastoma
B. Retinoblastoma
C. Hepatoblastoma
D. Seminoma (Correct Answer)

Explanation: **Explanation:** The correct answer is **D. Seminoma**. **1. Why Seminoma is the correct answer:** The term **"-blastoma"** refers to a tumor composed of primitive, undifferentiated cells (blasts) that resemble embryonic tissue [1]. These tumors are characteristically seen in infants and young children (usually <5 years) [1]. In contrast, a **Seminoma** is a germ cell tumor of the testis that typically occurs in young adults, with a peak incidence between **30 and 50 years of age**. It is extremely rare in the prepubertal pediatric population [4]. **2. Analysis of Incorrect Options:** * **A. Neuroblastoma:** This is the most common extracranial solid tumor of childhood [2]. It arises from the neural crest cells of the sympathetic nervous system, most commonly in the adrenal medulla [1], [2]. * **B. Retinoblastoma:** This is the most common intraocular malignancy of childhood [2]. It is associated with the *RB1* gene mutation and typically presents with leukocoria (white pupillary reflex) before age 3 [1]. * **C. Hepatoblastoma:** This is the most common primary liver tumor in children, usually occurring before the age of 3 [1], [2]. It is associated with Beckwith-Wiedemann syndrome and Familial Adenomatous Polyposis (FAP). **3. High-Yield Clinical Pearls for NEET-PG:** * **Small Round Blue Cell Tumors:** All the "blastomas" listed belong to this category histologically. * **Seminoma Marker:** The most characteristic marker is **PLAP** (Placental-like Alkaline Phosphatase) [3]. Unlike other germ cell tumors, pure seminomas do **not** produce AFP. * **Homer-Wright Rosettes:** Classically seen in Neuroblastoma and Medulloblastoma. * **Flexner-Wintersteiner Rosettes:** Pathognomonic for Retinoblastoma. * **Age Rule:** If a tumor name ends in "-blastoma," think pediatric; if it is a "Seminoma" or "Carcinoma," think adults. **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. 211-212. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of Infancy and Childhood, pp. 483-484. [3] 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. [4] 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.

Question 653: What is the most successful application of tumor markers?

A. Screening in asymptomatic individuals
B. Monitoring the effect of treatment and early detection of recurrence (Correct Answer)
C. Differentiating benign from malignant lesions
D. Staging the extent of disease

Explanation: ### Explanation Tumor markers are substances (proteins, hormones, or enzymes) produced by neoplastic cells or by the body in response to cancer. While they are valuable tools, their utility is limited by specific constraints in sensitivity and specificity. **1. Why Option B is Correct:** The most successful and clinically significant application of tumor markers is **monitoring the response to therapy and detecting recurrence**. [1] * **Concept:** If a marker is elevated at diagnosis, a successful surgical resection or chemotherapy should cause the levels to drop (often to undetectable levels). A subsequent rise in the marker level is frequently the first objective evidence of tumor recurrence or metastasis, often preceding clinical or radiological findings. **2. Why Other Options are Incorrect:** * **Option A (Screening):** Most markers are not specific enough for screening asymptomatic populations because they can be elevated in inflammatory or benign conditions (e.g., PSA in prostatitis) [2]. *Exceptions:* PSA (Prostate) and AFP (Hepatocellular carcinoma in high-risk groups) are used for screening, but this is not their "most successful" universal application. [2] * **Option C (Diagnosis):** Tumor markers cannot definitively differentiate benign from malignant lesions. A biopsy remains the gold standard. Markers are "adjuncts" to diagnosis, not replacements. * **Option D (Staging):** While some markers (like LDH in melanoma or AFP/HCG in germ cell tumors) correlate with tumor burden, staging is primarily determined by TNM (Tumor, Node, Metastasis) clinical and pathological criteria. **High-Yield Clinical Pearls for NEET-PG:** * **PSA (Prostate Specific Antigen):** Most widely used, but organ-specific, not cancer-specific. [2] * **CEA (Carcinoembryonic Antigen):** Used for monitoring Colorectal Cancer; elevated in smokers. [2] * **CA-125:** Used for monitoring Ovarian Cancer; can be elevated in endometriosis or menstruation. * **AFP (Alpha-fetoprotein):** Marker for HCC and Yolk Sac Tumors. [2] * **Calcitonin:** Marker for Medullary Carcinoma of the Thyroid. * **Rule of Thumb:** Tumor markers are for **"Follow-up,"** not for **"First Diagnosis."** [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. 254-255. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, p. 346.

Question 654: Which of the following is a testicular tumor marker?

A. a-Fetoprotein (Correct Answer)
B. Ectopic hormones
C. CEA
D. Testosterone

Explanation: **Explanation:** **Alpha-Fetoprotein (AFP)** is a classic oncofetal antigen and a highly specific tumor marker for certain Germ Cell Tumors (GCTs). In the context of testicular cancer, AFP is synthesized by **Yolk Sac Tumor** elements [1]. It is also elevated in Embryonal Carcinomas. Crucially, AFP is **never** elevated in pure Seminomas; therefore, an elevated AFP in a patient with a seminoma suggests a mixed germ cell component [1]. **Analysis of Incorrect Options:** * **Ectopic hormones:** While some tumors produce ectopic hormones (e.g., ACTH in Small Cell Lung Cancer), they are not standard diagnostic markers for testicular tumors. Note that hCG is a hormone produced by trophoblastic tissue, but it is not classified as "ectopic" in this context. * **CEA (Carcinoembryonic Antigen):** This is primarily a marker for colorectal, gastrointestinal, and pancreatic carcinomas. It has no diagnostic utility for testicular malignancies. * **Testosterone:** While Leydig cell tumors (sex cord-stromal tumors) may secrete testosterone, it is not a general or reliable marker for the more common germ cell tumors. **High-Yield Clinical Pearls for NEET-PG:** 1. **The Triple Marker Profile:** Testicular GCTs are monitored using **AFP**, **hCG** (produced by syncytiotrophoblasts [3]), and **LDH** (reflects tumor burden/growth rate). 2. **Yolk Sac Tumor:** AFP is the gold standard marker; look for "Schiller-Duval bodies" on histology. 3. **Seminoma Rule:** If a biopsy says "Seminoma" but AFP is high, the diagnosis must be changed to **Mixed Germ Cell Tumor** [2]. 4. **Choriocarcinoma:** Characterized by 100% elevation of hCG [3]; AFP remains normal. **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] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Diseases Of The Urinary And Male Genital Tracts, pp. 512-513. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Lower Urinary Tract and Male Genital System, p. 982.

Question 655: A benign epithelial cell neoplasm derived from non-glandular surfaces is referred to as:

A. papilloma (Correct Answer)
B. sarcoma
C. adenoma
D. hamartoma

Explanation: ### Explanation **Correct Option: A. Papilloma** In pathology, the nomenclature of tumors is based on their origin and behavior. A **papilloma** is a benign epithelial neoplasm that arises from non-glandular surfaces (such as the skin, squamous mucosa, or transitional epithelium) [1]. These tumors characteristically produce microscopic or macroscopic finger-like fronds or projections [2]. Examples include squamous cell papilloma of the skin or transitional cell papilloma of the bladder [2]. **Analysis of Incorrect Options:** * **B. Sarcoma:** This term refers to **malignant** tumors arising from **mesenchymal** (connective) tissues, such as bone (osteosarcoma) or fat (liposarcoma) [1]. * **C. Adenoma:** This is a benign epithelial neoplasm, but it is specifically derived from **glandular tissues** or forms glandular patterns (e.g., colonic adenoma or thyroid adenoma) [1]. * **D. Hamartoma:** This is a non-neoplastic, disorganized mass of cells and tissues indigenous to a particular site (e.g., a pulmonary hamartoma containing cartilage and bronchial epithelium). It is considered a developmental malformation rather than a true neoplasm. **High-Yield NEET-PG Pearls:** * **Nomenclature Rule:** Benign tumors usually end in the suffix **"-oma"** (with exceptions like Melanoma, Lymphoma, and Seminoma, which are malignant) [1]. * **Mixed Tumors:** A single germ cell layer tumor that differentiates into more than one cell type is called a **Pleomorphic Adenoma** (e.g., in the parotid gland). * **Teratoma:** A tumor containing cells from more than one germ cell layer (ectoderm, mesoderm, and endoderm). * **Choristoma:** Ectopic rest of normal tissue in an abnormal location (e.g., pancreatic tissue in the stomach wall). **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. 208-209. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Disorders Involving Inflammatory And Haemopoietic Cells, pp. 642-643.

Question 656: A chronic alcoholic has elevated serum alpha fetoprotein levels. Which of the following neoplasms is most likely?

A. Prostatic adenocarcinoma
B. Multiple myeloma
C. Hepatocellular carcinoma (Correct Answer)
D. Glioblastoma multiforme

Explanation: ### Explanation **Correct Answer: C. Hepatocellular carcinoma (HCC)** **Underlying Concept:** Alpha-fetoprotein (AFP) is a glycoprotein normally synthesized by the fetal liver and yolk sac. In adults, it serves as a highly specific **tumor marker** for certain malignancies. Chronic alcoholism is a leading cause of liver cirrhosis, which is the strongest predisposing factor for **Hepatocellular Carcinoma** [2]. In the context of chronic liver disease, a significant elevation in AFP (typically >400 ng/mL) is highly suggestive of HCC [1]. **Analysis of Incorrect Options:** * **A. Prostatic adenocarcinoma:** The primary tumor marker is **PSA (Prostate-Specific Antigen)**. AFP is not associated with prostate cancer. * **B. Multiple myeloma:** This is a plasma cell dyscrasia characterized by **M-protein spikes** on electrophoresis and Bence-Jones proteins in urine. AFP levels remain normal. * **C. Glioblastoma multiforme:** This is a high-grade glial tumor of the CNS. It does not secrete systemic oncofetal antigens like AFP. **High-Yield Clinical Pearls for NEET-PG:** * **AFP is elevated in:** Hepatocellular carcinoma, Yolk sac tumors (Endodermal sinus tumors), and occasionally in Cirrhosis/Hepatitis (usually lower levels) [1]. * **Screening:** In cirrhotic patients, USG abdomen + Serum AFP every 6 months is the standard screening protocol for HCC [1][3]. * **Non-neoplastic AFP elevation:** Neural tube defects (e.g., Spina bifida) and abdominal wall defects (Omphalocele) in pregnancy. * **Decreased AFP in pregnancy:** Associated with **Down Syndrome (Trisomy 21)**. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Liver And Biliary System Disease, pp. 399-400. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Liver and Gallbladder, pp. 876-877. [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. 223-224.

Question 657: Squamous cell carcinoma commonly spreads via which route?

A. Implantation
B. Hematogenous spread
C. Lymphatic spread (Correct Answer)
D. Trancoelomic spread

Explanation: **Explanation:** The correct answer is **C. Lymphatic spread.** **1. Why Lymphatic Spread is Correct:** In oncology, the general rule for malignant dissemination is that **carcinomas** (malignant tumors of epithelial origin) primarily spread via the **lymphatic system**, while **sarcomas** (malignant tumors of mesenchymal origin) primarily spread via the **hematogenous route** [1], [2]. Squamous cell carcinoma (SCC) is an epithelial malignancy; therefore, it typically involves regional lymph nodes first before spreading to distant organs [3]. The tumor cells invade local lymphatics and travel to the sentinel nodes, following the natural drainage pattern of the primary site [1]. **2. Analysis of Incorrect Options:** * **A. Implantation:** Also known as "seeding," this occurs when tumor cells fall onto a surface (e.g., a surgeon’s scalpel or needle tract). While possible, it is not the *common* or primary route for SCC. * **B. Hematogenous spread:** This is the preferred route for sarcomas [1]. While SCC can eventually spread via the blood in advanced stages (leading to lung or liver metastasis), it is not the initial or most characteristic route. * **D. Transcoelomic spread:** This refers to spread across body cavities (e.g., peritoneal or pleural spaces) [3]. It is classic for ovarian cancer (Krukenberg tumor) or gastric cancer, but not SCC. **3. NEET-PG High-Yield Pearls:** * **The "Exceptions" Rule:** While most carcinomas spread via lymphatics, remember the four carcinomas that prefer **hematogenous spread**: **R**enal Cell Carcinoma, **H**epatocellular Carcinoma, **F**ollicular Carcinoma of Thyroid, and **C**horiocarcinoma (Mnemonic: **R**ich **H**eirs **F**eel **C**ool). * **Sarcoma Exception:** Most sarcomas spread via blood, but **Rhabdomyosarcoma** and **Epithelioid Sarcoma** often spread via lymphatics. * **Sentinel Lymph Node:** This is the first node that receives lymph drainage from a primary tumor; it is the first site of metastasis for SCC. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, p. 282. [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. 233-234. [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. 234-235.

Question 658: A 70-year-old man has smoked for years despite a chronic productive cough. He notices blood in his sputum and sees his physician. A chest x-ray reveals a mass in the left lung, which is biopsied during a fiberoptic bronchoscopy. Assuming that this patient's cancer is etiologically related to his smoking, which of the following diagnoses are most likely to be returned by the pathology laboratory?

A. Adenocarcinoma or bronchioloalveolar carcinoma
B. Adenocarcinoma or small cell carcinoma
C. Bronchioloalveolar carcinoma or small cell carcinoma
D. Small cell carcinoma or squamous cell carcinoma (Correct Answer)

Explanation: ### Explanation **Correct Answer: D. Small cell carcinoma or squamous cell carcinoma** #### 1. Why the Correct Answer is Right The association between cigarette smoking and lung cancer is strongest for **Squamous Cell Carcinoma (SCC)** and **Small Cell Carcinoma (SCLC)** [1], [4]. These two types typically arise **centrally** (near the hilum) from the major bronchi [1], [2]. * **Pathogenesis:** Chronic smoking induces squamous metaplasia of the bronchial epithelium, which progresses to dysplasia and eventually invasive SCC [3]. * **Clinical Correlation:** The patient’s history of chronic productive cough and hemoptysis, combined with a central mass (accessible via fiberoptic bronchoscopy), is classic for these smoking-related subtypes. #### 2. Why Other Options are Wrong * **Adenocarcinoma (Options A & B):** While adenocarcinoma is now the most common type of lung cancer overall (even in smokers), it is the most common type found in **non-smokers**. It typically arises **peripherally**, making it less likely to be the primary diagnosis in a heavy smoker with a central bronchial mass [1]. * **Bronchioloalveolar Carcinoma (now called Adenocarcinoma in situ) (Options A & C):** This is a subtype of adenocarcinoma that is notably **unrelated to smoking**. It typically presents as a peripheral interstitial infiltrate mimicking pneumonia. #### 3. NEET-PG High-Yield Pearls * **The "S" Rule:** **S**moking is most strongly linked to **S**quamous and **S**mall cell carcinoma; both are usually **S**entral in location. * **Paraneoplastic Syndromes:** * **Squamous Cell:** Produces PTHrP (leads to **Hypercalcemia**). * **Small Cell:** Produces ACTH (Cushing’s) or ADH (SIADH); associated with Lambert-Eaton Syndrome. * **Most Common:** Adenocarcinoma is the most common lung cancer in women and non-smokers. * **Genetics:** Small cell carcinoma is almost universally associated with **TP53** and **RB1** mutations [4]. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Respiratory Tract Disease, pp. 336-337. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Respiratory Tract Disease, pp. 337-338. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Lung, p. 723. [4] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Lung, p. 721.

Question 659: A 59-year-old man complains of progressive weakness and very dark stools. Physical examination demonstrates fullness in the right lower quadrant. Laboratory studies show iron deficiency anemia (serum hemoglobin 7.4 g/dL) and positive occult blood in stool specimens. Colonoscopy discloses an ulcerating lesion of the cecum. Which of the following serum tumor markers is most likely to be useful for monitoring this patient after surgery?

A. Alpha-fetoprotein
B. Carcinoembryonic antigen (Correct Answer)
C. Chorionic gonadotropin
D. Chromogranin

Explanation: ### Explanation **Correct Option: B. Carcinoembryonic antigen (CEA)** The clinical presentation—a 59-year-old male with iron deficiency anemia (IDA), occult blood in stools, and a mass in the cecum—is a classic textbook description of **Right-sided Colorectal Carcinoma (CRC)** [1]. In elderly males, IDA is considered colon cancer until proven otherwise. **Carcinoembryonic antigen (CEA)** is the most widely used tumor marker for colorectal adenocarcinoma [1]. It is important to note that CEA is **not used for screening or diagnosis** due to low sensitivity and specificity (it can be elevated in smokers, cirrhosis, and ulcerative colitis). Its primary clinical utility lies in **monitoring for recurrence** and assessing the response to therapy after surgical resection [1]. A rising CEA level post-surgery is often the first sign of tumor recurrence. **Analysis of Incorrect Options:** * **A. Alpha-fetoprotein (AFP):** Marker for Hepatocellular Carcinoma (HCC) and Non-seminomatous germ cell tumors (specifically Yolk Sac Tumors). * **C. Chorionic gonadotropin (hCG):** Marker for Choriocarcinoma and Hydatidiform moles; also elevated in some germ cell tumors. * **D. Chromogranin:** A marker for neuroendocrine tumors (e.g., Carcinoid tumors, Small cell carcinoma). While carcinoids can occur in the appendix/cecum, they typically do not present with chronic occult blood loss and severe IDA like adenocarcinomas. **High-Yield Clinical Pearls for NEET-PG:** * **Right-sided CRC:** Presents with "Exophytic" masses, occult bleeding, and IDA. * **Left-sided CRC:** Presents with "Napkin-ring" constriction, altered bowel habits, and intestinal obstruction. * **CEA Rule:** High pre-operative CEA levels correlate with a poorer prognosis. * **Other Markers:** CA 19-9 (Pancreatic cancer), CA-125 (Ovarian cancer), PSA (Prostate cancer). **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, pp. 819-821.

Question 660: All are true about salivary gland tumors except:

A. Parotid gland is the most common site of involvement.
B. Warthin tumor is almost always found in the parotid gland.
C. Minor gland tumors are mostly malignant.
D. Parotid tumors are mostly malignant. (Correct Answer)

Explanation: ### Explanation The correct answer is **D**, as it is a false statement. In salivary gland pathology, there is an **inverse relationship** between the size of the gland and the likelihood of malignancy. **1. Why Option D is the correct answer (False statement):** While the parotid gland is the most common site for salivary tumors, approximately **75-80% of parotid tumors are benign** (most commonly Pleomorphic Adenoma). Only about 20-25% are malignant. Therefore, stating they are "mostly malignant" is factually incorrect [1]. **2. Analysis of other options:** * **Option A:** The **Parotid gland** is indeed the most common site, accounting for nearly 65-80% of all salivary gland neoplasms [1]. * **Option B:** **Warthin tumor** (Papillary Cystadenoma Lymphomatosum) is unique because it occurs almost exclusively in the parotid gland [1]. It is also associated with smoking and can be bilateral or multifocal. * **Option C:** According to the "Rule of Proportion," as the gland size decreases, the risk of malignancy increases. About **50-80% of minor salivary gland tumors are malignant** (most commonly Adenoid Cystic Carcinoma) [1]. **3. High-Yield Clinical Pearls for NEET-PG:** * **Most common overall tumor:** Pleomorphic Adenoma (Benign Mixed Tumor). * **Most common malignant tumor (Adults & Children):** Mucoepidermoid Carcinoma [1]. * **Most common site for Mucoepidermoid Carcinoma:** Parotid gland [1]. * **Tumor with propensity for perineural invasion:** Adenoid Cystic Carcinoma (presents with pain/palsy) [1]. * **Hot spot on Technetium-99m scan:** Warthin Tumor. * **The "Rule of 80s" for Parotid:** 80% are in the parotid, 80% are benign, 80% are Pleomorphic Adenoma. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Head and Neck, pp. 750-755.

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Neoplasia — MCQs

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