General Pathology — MCQs

General Pathology Indian Medical PG Practice Questions and MCQs

Question 381: What is diapedesis?

A. Immigration of leukocytes through the basement membrane
B. Immigration of leukocytes through the endothelial gap to the site of inflammation (Correct Answer)
C. Aggregation of platelets at the site of inflammation
D. Auto-digestion of cells

Explanation: **Explanation:** **Diapedesis** (also known as **transmigration**) is a critical step in the cellular phase of acute inflammation [1]. It refers to the process where leukocytes (primarily neutrophils) crawl through the intercellular junctions (gaps) between endothelial cells to exit the bloodstream and enter the extravascular space [1], [2]. 1. **Why Option B is Correct:** After leukocytes undergo rolling and firm adhesion to the endothelium, they extend pseudopods into the junctions between endothelial cells [1]. This movement is mediated by adhesion molecules, most notably **PECAM-1 (CD31)** [2], which is expressed on both the leukocytes and the endothelial cell junctions. This allows the cells to "squeeze" through the gap toward the site of injury [2]. 2. **Why Other Options are Incorrect:** * **Option A:** While leukocytes must eventually cross the basement membrane, diapedesis specifically refers to the movement through the **endothelial layer** [1]. Crossing the basement membrane occurs via the secretion of collagenases [2]. * **Option C:** This describes **platelet aggregation**, a component of hemostasis/thrombosis, not the leukocyte extravation cascade [2]. * **Option D:** This describes **autolysis**, a process of cell self-destruction by its own enzymes, typically seen in post-mortem changes or necrosis. **High-Yield Clinical Pearls for NEET-PG:** * **Key Molecule:** **PECAM-1 (CD31)** is the most important molecule for diapedesis [2]. * **Site of Action:** Diapedesis occurs predominantly in the **post-capillary venules** [1]. * **Sequence of Extravasation:** Margination → Rolling (Selectins) → Adhesion (Integrins) → **Diapedesis (PECAM-1)** → Chemotaxis [2], [3]. * **Clinical Correlation:** Deficiencies in these steps lead to **Leukocyte Adhesion Deficiency (LAD)**, characterized by recurrent infections and delayed umbilical cord separation [2]. **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. 188-189. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Inflammation and Repair, pp. 87-89. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Migration in the tissues toward a chemotactic stimulus, pp. 86-87.

Question 382: Which cells are primarily affected by HIV?

A. CD4 cells (Correct Answer)
B. CD8 cells
C. T cells
D. Plasma cells

Explanation: **Explanation:** The Human Immunodeficiency Virus (HIV) primarily targets and destroys **CD4+ T-lymphocytes** (Helper T cells) [1]. The hallmark of HIV pathogenesis is the high affinity between the viral envelope glycoprotein **gp120** and the **CD4 molecule** expressed on the surface of these cells [1]. Once gp120 binds to CD4, it undergoes a conformational change allowing it to bind to co-receptors (**CCR5** or **CXCR4**), leading to viral entry and subsequent cell lysis or apoptosis [1]. **Analysis of Options:** * **CD4 cells (Correct):** These are the primary targets. The progressive depletion of these cells leads to profound immunosuppression, defining the transition to AIDS [1]. * **CD8 cells (Incorrect):** These are Cytotoxic T cells. While they play a role in the immune response *against* HIV, they lack the CD4 receptor and are not the primary targets for viral entry [1]. * **T cells (Incorrect):** This is too broad. T cells include both CD4+ and CD8+ subsets. While HIV affects a subset of T cells, the specificity lies with the CD4+ population [1]. * **Plasma cells (Incorrect):** These are terminally differentiated B cells that produce antibodies. They are not directly infected by HIV, although their function is impaired due to the lack of "help" from depleted CD4 cells [1]. **High-Yield Clinical Pearls for NEET-PG:** * **Co-receptors:** **CCR5** is essential for "Macrophage-tropic" (R5) strains (early infection), while **CXCR4** is used by "T-cell-tropic" (X4) strains (late-stage/progression) [1]. * **Other Targets:** HIV also infects other CD4-expressing cells like **Macrophages** and **Dendritic cells** (which act as reservoirs) and **Microglial cells** in the brain (leading to HIV-associated dementia) [1]. * **Diagnosis:** A CD4 count below **200 cells/mm³** is a diagnostic criterion for AIDS [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of the Immune System, pp. 255-260.

Question 383: Autoimmunity is caused by which of the following mechanisms?

A. The pressure of forbidden clones
B. Expression of cryptic antigens
C. Defective negative selection of T-cells in the thymus (Correct Answer)
D. Inappropriate expression of MHC proteins

Explanation: **Explanation:** **Central Tolerance and Autoimmunity** The fundamental mechanism preventing autoimmunity is **Central Tolerance**. This process occurs in the thymus for T-cells and the bone marrow for B-cells [1]. During T-cell maturation, **negative selection** occurs: developing T-cells that recognize self-antigens with high affinity are induced to undergo apoptosis (deletion) [1]. If this process is defective, self-reactive T-cells escape into the peripheral circulation, where they can attack the body's own tissues, leading to autoimmune diseases [4]. **Analysis of Options:** * **Option C (Correct):** Defective negative selection is a primary failure of central tolerance. A classic example is a mutation in the **AIRE (Autoimmune Regulator) gene**, which leads to APECED (Autoimmune Polyendocrinopathy-Candidiasis-Ectodermal Dystrophy) because self-antigens aren't properly presented in the thymus [1]. * **Option A (Incorrect):** This is a distractor. The actual theory is the **"Persistence of forbidden clones,"** not "pressure." It refers to self-reactive lymphocytes that should have been deleted but survived [2]. * **Option B (Incorrect):** While the *exposure* of sequestered (cryptic) antigens (e.g., post-trauma to the eye or testes) can trigger autoimmunity, the "expression" of these antigens is a normal physiological state; it is their **release/exposure** to the immune system that is pathological. * **Option D (Incorrect):** While certain MHC (HLA) types are *associated* with autoimmune risks (e.g., HLA-B27), "inappropriate expression" is not a primary mechanism of autoimmunity compared to the failure of tolerance [2]. **High-Yield Clinical Pearls for NEET-PG:** * **AIRE Gene:** Essential for expressing peripheral tissue antigens in the thymus for negative selection [1]. * **Peripheral Tolerance:** Includes Anergy (functional inactivation via CTLA-4/PD-1), Suppression by T-regs (CD24+, CD25+, FoxP3+), and Deletion [3], [5]. * **Molecular Mimicry:** A key trigger where foreign antigens (e.g., Streptococcal M protein) cross-react with self-antigens (cardiac myosin), causing Rheumatic Heart Disease. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of the Immune System, pp. 220-221. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of the Immune System, pp. 228-230. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of the Immune System, pp. 221-222. [4] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of the Immune System, pp. 222-223. [5] 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. 176-177.

Question 384: A phenotypically normal woman with difficulties in conceiving was found to have three Barr bodies on karyotype analysis, with no translocations or large deletions. Her karyotype would be best represented by which one of the following?

A. 48 XXXXY
B. 46 XX
C. 48 XXXX (Correct Answer)
D. 48 XXXY

Explanation: ### Explanation **1. Understanding the Lyon Hypothesis (X-inactivation)** The number of Barr bodies (sex chromatin) in a somatic cell follows the **"N-1 Rule,"** where 'N' is the total number of X chromosomes present [1]. In any human cell, only one X chromosome remains active; all additional X chromosomes undergo heterochromatinization to become inactive Barr bodies. In this case, the patient has **three Barr bodies**. Applying the formula: * $N - 1 = 3$ * $N = 4$ Therefore, the individual must have **four X chromosomes** [1]. **2. Why 48, XXXX is Correct** The patient is described as **phenotypically female** and has four X chromosomes. This karyotype (Tetrasomy X) results in three Barr bodies. While often associated with mild intellectual disability or physical tallness, many cases remain undiagnosed due to a relatively normal phenotype, consistent with the "difficulties in conceiving" mentioned in the stem [1]. **3. Analysis of Incorrect Options** * **48, XXXXY (Option A):** This individual would have three Barr bodies but would be **phenotypically male** due to the presence of the Y chromosome (a variant of Klinefelter syndrome) [1]. * **46, XX (Option B):** A normal female has one Barr body ($2 - 1 = 1$). * **48, XXXY (Option D):** This individual would have **two Barr bodies** ($3 - 1 = 2$) and would be phenotypically male [1]. **Clinical Pearls for NEET-PG:** * **Barr Body Location:** Seen as a small, dense mass of chromatin against the inner nuclear membrane (e.g., in buccal smears) or as a "drumstick" in neutrophils. * **Turner Syndrome (45, XO):** Zero Barr bodies (phenotypic female) [1]. * **Klinefelter Syndrome (47, XXY):** One Barr body (phenotypic male) [1]. * **Rule of Thumb:** The presence of a **Y chromosome** (specifically the SRY gene) determines male phenotype, regardless of the number of X chromosomes [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Genetic Disorders, pp. 173-177.

Question 385: Chromosomal non-disjunction is responsible for all of the following conditions EXCEPT:

A. Down's syndrome
B. Neurofibromatosis type 1 (Correct Answer)
C. Prader-Willi syndrome
D. Angelman syndrome

Explanation: **Explanation:** The core concept tested here is the mechanism of genetic inheritance. **Chromosomal non-disjunction** refers to the failure of homologous chromosomes or sister chromatids to separate properly during meiosis or mitosis, leading to **aneuploidy** (an abnormal number of chromosomes) [1]. **Why Neurofibromatosis type 1 (NF1) is the correct answer:** NF1 is an **Autosomal Dominant** disorder caused by a specific **gene mutation** (point mutation, insertion, or deletion) in the *NF1* gene located on chromosome **17q11.2** [4]. It is not caused by a numerical chromosomal abnormality or non-disjunction. **Analysis of incorrect options:** * **Down’s Syndrome (Trisomy 21):** The most common cause (95% of cases) is meiotic non-disjunction, resulting in an extra copy of chromosome 21 [1]. * **Prader-Willi (PWS) and Angelman Syndromes:** While these are classic examples of genomic imprinting, they can both be caused by **Uniparental Disomy (UPD)** [2]. UPD occurs when a zygote starts as a trisomy (due to non-disjunction) and subsequently loses one chromosome ("trisomy rescue"), leaving two chromosomes from a single parent. **High-Yield NEET-PG Pearls:** * **NF1 Gene:** Encodes **Neurofibromin**, a negative regulator of the RAS pathway (a tumor suppressor). * **NF1 Clinical Features:** Café-au-lait spots, Lisch nodules (iris hamartomas), and neurofibromas [4]. * **Non-disjunction Risk:** The risk of meiotic non-disjunction increases significantly with **advanced maternal age** [1]. * **PWS vs. Angelman:** PWS is the loss of the *paternal* 15q11-q13 (Mnemonic: **P**aternal **P**rader), while Angelman is the loss of the *maternal* 15q11-q13 (Mnemonic: **M**aternal **M**atthew/Angelman) [2][3]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Genetic Disorders, pp. 170-171. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Genetic Disorders, pp. 181-182. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Genetic Disorders, pp. 182-183. [4] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Peripheral Nerves and Skeletal Muscles, pp. 1249-1250.

Question 386: Integrins are associated with all of the following processes except:

A. Rolling (Correct Answer)
B. Adhesion
C. Arrest
D. Transmigration of cells

Explanation: The process of leukocyte extravasation occurs in a sequential manner, and understanding the specific molecules involved in each step is high-yield for NEET-PG. **Why "Rolling" is the correct answer:** Rolling is the initial, loose, and transient attachment of leukocytes to the endothelium [2]. This step is mediated by **Selectins** (L-selectin on leukocytes; E and P-selectins on endothelium) and their carbohydrate ligands (Sialyl-Lewis X) [2]. Integrins are not involved in rolling; they are expressed in a low-affinity state during this phase and only become activated later. **Explanation of Incorrect Options:** * **Adhesion (Firm Adhesion):** This is the primary function of integrins [1]. Once leukocytes are activated by chemokines, their surface **Integrins** (like LFA-1 and VLA-4) switch to a high-affinity state and bind to **Immunoglobulin superfamily** ligands (ICAM-1 and VCAM-1) on the endothelium [2]. * **Arrest:** This refers to the cessation of leukocyte movement. Firm adhesion mediated by integrins leads directly to the "arrest" of the cell on the vessel wall, preventing it from being swept away by blood flow. * **Transmigration (Diapedesis):** While PECAM-1 (CD31) is the primary molecule for squeezing through junctions [3], integrins play a crucial role in the crawling movement (haptotaxis) toward the endothelial junctions and the initial docking required for transmigration [1]. **High-Yield Clinical Pearls:** * **Leukocyte Adhesion Deficiency (LAD) Type 1:** Caused by a defect in the **CD18** subunit of integrins (LFA-1/MAC-1) [3]. Clinical signs: Delayed separation of the umbilical cord, recurrent bacterial infections, and lack of pus formation. * **LAD Type 2:** Caused by a defect in Sialyl-Lewis X (Selectin ligand), affecting the **Rolling** phase. * **Memory Trick:** **S**electins = **S**low down (Rolling); **I**ntegrins = **I**mmobilize (Adhesion). **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. With Illustrations By, pp. 36-37. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Migration in the tissues toward a chemotactic stimulus, pp. 86-87. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Inflammation and Repair, pp. 87-89.

Question 387: MIC-2 is a marker of:

A. Ewing's sarcoma (Correct Answer)
B. Osteosarcoma
C. Dermatofibrous protruberans
D. Alveolar cell sarcoma

Explanation: **Explanation:** **MIC-2 (CD99)** is a cell surface glycoprotein encoded by the *MIC2* gene. It is the most sensitive immunohistochemical marker for the **Ewing’s Sarcoma/Primitive Neuroectodermal Tumor (PNET)** family of tumors. In Ewing’s sarcoma, MIC-2 typically shows a strong, diffuse membranous staining pattern, which is crucial for differentiating it from other "small round blue cell tumors" of childhood. **Analysis of Options:** * **Ewing's Sarcoma (Correct):** Characterized by the chromosomal translocation **t(11;22)(q24;q12)**, leading to the *EWS-FLI1* fusion gene. MIC-2/CD99 is positive in over 95% of cases. * **Osteosarcoma:** The primary markers are **SATB2** and Osteonectin. While some variants may show focal CD99 positivity, it is not a diagnostic marker for Osteosarcoma [1], [2]. * **Dermatofibrosarcoma Protuberans (DFSP):** This is characterized by the marker **CD34** and the translocation t(17;22). * **Alveolar Soft Part Sarcoma:** This tumor is characterized by the **ASPSCR1-TFE3** fusion gene and shows nuclear positivity for **TFE3**. **High-Yield Clinical Pearls for NEET-PG:** * **CD99 (MIC-2)** is highly sensitive but **not specific**; it can also be positive in T-cell Lymphoblastic Lymphoma, Synovial Sarcoma, and Solitary Fibrous Tumors. * **Ewing’s Sarcoma Radiology:** Classically presents with an "onion-skin" periosteal reaction. * **PAS Positivity:** Ewing’s sarcoma cells are often PAS-positive due to the presence of cytoplasmic glycogen (diastase sensitive). * **Homer-Wright Rosettes:** Their presence indicates neuroectodermal differentiation (PNET). **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] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Bones, Joints, and Soft Tissue Tumors, p. 1200.

Question 388: Migratory thrombophlebitis is seen in which of the following conditions?

A. Disseminated cancer (Correct Answer)
B. Rheumatic heart disease
C. Libman-Sacks endocarditis
D. All of the above

Explanation: **Explanation:** **Migratory thrombophlebitis**, also known as **Trousseau sign of malignancy**, is a paraneoplastic syndrome characterized by recurrent episodes of venous thrombosis that appear in different (migratory) locations over time [1]. **1. Why Option A is Correct:** In **disseminated cancer** (most classically **adenocarcinoma of the pancreas**, but also lung and gastric cancers), tumor cells release procoagulants such as **tissue factor** and **mucins** [1]. These substances activate the coagulation cascade systemically, leading to a hypercoagulable state. This results in the formation of venous thrombi that resolve in one site only to reappear in another [1]. **2. Why Other Options are Incorrect:** * **Option B (Rheumatic Heart Disease):** While RHD can lead to atrial fibrillation and subsequent systemic embolization (usually from the left atrium), it does not cause the systemic, migratory venous inflammation characteristic of Trousseau syndrome. * **Option C (Libman-Sacks Endocarditis):** This is characterized by small, sterile vegetations on the heart valves in patients with Systemic Lupus Erythematosus (SLE) [2]. While it represents a form of non-bacterial thrombotic endocarditis (NBTE), it does not manifest as migratory thrombophlebitis of the peripheral veins [2]. **Clinical Pearls for NEET-PG:** * **Trousseau Sign:** Do not confuse this with the "Trousseau sign of latent tetany" (carpopedal spasm induced by BP cuff inflation in hypocalcemia). * **Association:** Most strongly associated with **tail/body of the pancreas** carcinoma. * **Pathogenesis:** Involves the interaction of circulating mucins with L-selectin and P-selectin, triggering microthrombi. * **NBTE:** Both Migratory Thrombophlebitis and Non-Bacterial Thrombotic Endocarditis can occur as paraneoplastic manifestations of advanced malignancy [2]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of Infancy and Childhood, pp. 522-523. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Heart, p. 570.

Question 389: What is LATS?

A. IgM
B. IgG (Correct Answer)
C. Glycoprotein
D. IgA

Explanation: **Explanation:** **LATS (Long-Acting Thyroid Stimulator)** is a clinical term historically used to describe the autoantibodies found in patients with **Graves' Disease**. [1] **Why IgG is the correct answer:** LATS belongs to the **IgG (Immunoglobulin G)** class of antibodies. Specifically, these are **Thyroid Stimulating Immunoglobulins (TSI)**. They act as agonists by binding to the TSH receptors on the thyroid follicular cells. [1] Unlike physiological TSH, which is regulated by negative feedback, LATS provides prolonged stimulation (hence "Long-Acting"), leading to excessive production of T3 and T4 and the characteristic hyperthyroidism of Graves' disease. **Analysis of Incorrect Options:** * **IgM:** While IgM is the first antibody produced in an immune response, it is not the mediator of Graves' disease. LATS is a high-affinity, mature IgG antibody. * **Glycoprotein:** TSH (Thyroid Stimulating Hormone) itself is a glycoprotein, but LATS is an antibody (protein). * **IgA:** IgA is primarily involved in mucosal immunity and is not associated with the pathogenesis of autoimmune thyroiditis. **NEET-PG High-Yield Pearls:** * **Type of Hypersensitivity:** Graves' disease (mediated by LATS/TSI) is a classic example of **Type II Hypersensitivity** (specifically Type IIb or stimulating type). [1] * **Placental Transfer:** Because LATS is an **IgG**, it can cross the placenta. This explains why infants born to mothers with Graves' disease may suffer from **Neonatal Thyrotoxicosis**. * **Triad of Graves:** Hyperthyroidism, Exophthalmos (due to retro-orbital inflammation), and Pretibial Myxedema. * **HLA Association:** Strongly associated with **HLA-DR3** and **HLA-B8**. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of the Immune System, pp. 213-214.

Question 390: Gamna Gandy bodies contain hemosiderin and what else?

A. Na+
B. Ca++ (Correct Answer)
C. Mg++
D. Cl-

Explanation: **Explanation:** **Gamna-Gandy bodies** (also known as Siderofibrotic nodules) are small, firm, brownish-yellow nodules found in the spleen. They represent organized areas of focal hemorrhage within the splenic parenchyma. [1] 1. **Why Ca++ is correct:** When focal hemorrhage occurs (commonly due to portal hypertension), the hemoglobin from extravasated red blood cells breaks down into **hemosiderin**. [1] Over time, these areas undergo fibrosis. A key pathological feature is the deposition of inorganic salts—specifically **Calcium (Ca++)**—along with iron onto the fibrous connective tissue and elastic fibers. This process is a form of dystrophic calcification. Under a microscope, they appear as golden-yellow or brown deposits that stain positive with Prussian Blue (for iron) and Von Kossa (for calcium). 2. **Why other options are wrong:** * **Na+ (Sodium) and Cl- (Chloride):** These are the primary extracellular electrolytes involved in fluid balance and action potentials; they do not form solid precipitates or "bodies" within fibrotic tissues. * **Mg++ (Magnesium):** While magnesium can be found in some physiological crystals (like struvite), it is not a constituent of Gamna-Gandy bodies. **Clinical Pearls for NEET-PG:** * **Most Common Cause:** Portal Hypertension (leading to congestive splenomegaly). * **Other Causes:** Sickle Cell Anemia, Hemochromatosis, and Leukemia. * **Imaging:** On MRI, they show a characteristic **"blooming effect"** on Gradient Echo (GRE) sequences due to the paramagnetic properties of iron. * **Composition:** Fibrous tissue + Hemosiderin (Iron) + Calcium salts. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Cellular Responses to Stress and Toxic Insults: Adaptation, Injury, and Death, pp. 75-76.

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