General Pathology — MCQs

General Pathology Indian Medical PG Practice Questions and MCQs

Question 81: Calcification in necrotic tissue is called?

A. Dystrophic calcification (Correct Answer)
B. Metastatic calcification
C. Calcinosis
D. Tumoral calcinosis

Explanation: **Explanation:** **1. Why Dystrophic Calcification is Correct:** Dystrophic calcification refers to the deposition of calcium salts in **dead, dying, or necrotic tissues**. The hallmark of this process is that it occurs despite **normal serum calcium levels** and normal calcium metabolism. In necrotic cells, calcium entry is facilitated by the loss of membrane integrity; it then binds to phospholipids in membrane vesicles, forming crystalline calcium phosphate. Common examples include calcification in areas of caseous necrosis (Tuberculosis), fat necrosis [1], and atherosclerotic plaques. **2. Why Other Options are Incorrect:** * **Metastatic Calcification:** This occurs in **normal (viable) tissues** and is always associated with **deranged calcium metabolism** (hypercalcemia) [1]. Causes include hyperparathyroidism, vitamin D toxicity, or bone resorption due to tumors. It primarily affects interstitial tissues of the gastric mucosa, kidneys, and lungs [1]. * **Calcinosis:** This is a general term for the deposition of calcium in soft tissues (e.g., *Calcinosis cutis*), often seen in connective tissue disorders like systemic sclerosis (CREST syndrome). * **Tumoral Calcinosis:** A rare hereditary condition characterized by large, periarticular (near joints) calcified masses, usually due to hyperphosphatemia. **3. NEET-PG High-Yield Pearls:** * **Morphology:** On H&E stain, calcification appears **basophilic** (blue-purple), amorphous, and granular [1]. * **Psammoma Bodies:** These are laminated, concentric calcifications seen in specific tumors (e.g., Papillary thyroid carcinoma, Serous cystadenocarcinoma of the ovary, Meningioma). They are a form of **dystrophic calcification**. * **Initiation:** Dystrophic calcification starts in the **mitochondria** of dead cells [2]. * **Monckeberg Arteriosclerosis:** Calcification of the tunica media of medium-sized arteries; it is a classic example of dystrophic calcification. **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. 76-77. [2] 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. 53-55.

Question 82: At what time frame does reversible injury in the myocardium typically occur?

A. 2 minutes
B. 30 minutes (Correct Answer)
C. 2 hours
D. 5 hours

Explanation: **Explanation:** The correct answer is **B. 30 minutes**. [3] In the context of myocardial ischemia, the transition from reversible to irreversible injury is time-dependent. When blood flow to the myocardium is obstructed, aerobic metabolism ceases within seconds, leading to a drop in ATP levels. However, the structural integrity of the cell is maintained for a short window. **Reversible injury** (characterized by cellular swelling and fatty change) typically persists for up to **20 to 30 minutes**. [2], [3] If perfusion is restored within this timeframe, the myocytes can recover. Beyond 30 minutes, the injury becomes **irreversible**, leading to coagulative necrosis and cell death. [1], [3] **Analysis of Options:** * **A. 2 minutes:** Within 1–2 minutes of ischemia, myocardial contractility ceases (functional failure), but the cellular damage remains entirely reversible. [2], [4] * **C. 2 hours:** By this time, the injury is firmly irreversible. Microscopic changes like "wavy fibers" may begin to appear, and the process of coagulative necrosis is well underway. [1] * **D. 5 hours:** At this stage, irreversible damage is extensive. Gross changes are still not visible, but histopathological features of necrosis are prominent. [1] **High-Yield NEET-PG Pearls:** * **First change in Ischemia:** Loss of contractility (occurs within 60 seconds). [4] * **Earliest ultrastructural change:** Depletion of glycogen and mitochondrial swelling. [1], [3] * **Irreversible injury hallmark:** Severe mitochondrial vacuolization and **amorphous densities** (calcium-rich) in the mitochondrial matrix. [1] * **Golden Window:** Reperfusion within 20–30 minutes can prevent necrosis; this is the physiological basis for emergency interventions like primary PCI or thrombolysis. [2] **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Heart, p. 552. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Heart, pp. 554-556. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Heart, pp. 548-550. [4] 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. 61-62.

Question 83: Most commonly, paraneoplastic syndromes are associated with which type of carcinoma?

A. Bronchial carcinoid
B. Small cell carcinoma (Correct Answer)
C. Broncho-alveolar carcinoma
D. Bronchial adenocarcinoma

Explanation: **Explanation:** **Small cell carcinoma (SCLC)** of the lung is the correct answer because it is a **neuroendocrine tumor** derived from Kulchitsky cells [1]. These cells possess the biochemical machinery to synthesize and secrete various polypeptide hormones and bioactive amines [2]. Approximately 10% of patients with SCLC develop paraneoplastic syndromes, making it the most frequent culprit among all malignancies. **Analysis of Options:** * **Small cell carcinoma (Option B):** It is most strongly associated with **Ectopic ACTH secretion** (leading to Cushing syndrome) and **SIADH** (Syndrome of Inappropriate Antidiuretic Hormone). It is also linked to **Lambert-Eaton Myasthenic Syndrome**. * **Bronchial carcinoid (Option A):** While also a neuroendocrine tumor, it is generally slow-growing and less frequently associated with systemic paraneoplastic effects compared to the aggressive SCLC, though it can cause Carcinoid Syndrome (flushing, diarrhea). * **Bronchial adenocarcinoma (Option D):** This is the most common lung cancer in non-smokers and females. Its classic paraneoplastic association is **Hypertrophic Osteoarthropathy (HOA)** and digital clubbing, but it lacks the diverse endocrine profile of SCLC. * **Broncho-alveolar carcinoma (Option C):** Now classified under adenocarcinoma in situ, it is not a primary driver of systemic paraneoplastic syndromes. **High-Yield NEET-PG Pearls:** * **Squamous Cell Carcinoma** of the lung is most commonly associated with **Hypercalcemia** due to the secretion of Parathyroid Hormone-related Protein (PTHrP) [3]. (Mnemonic: **S**quamous = **S**tones/Calcium). * **Small Cell Carcinoma** is associated with **S**IADH and **S**ubacute cerebellar degeneration. * **Lambert-Eaton Syndrome** is an autoimmune attack against presynaptic voltage-gated calcium channels, often serving as a sentinel sign for underlying SCLC. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Respiratory Tract Disease, pp. 337-338. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Lung, pp. 725-727. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, pp. 338-339.

Question 84: From which source are stem cells typically harvested?

A. Skin
B. Bone marrow (Correct Answer)
C. Oral mucosa
D. Elementary tract

Explanation: **Explanation:** The correct answer is **Bone marrow (Option B)**. This is because bone marrow is the primary reservoir for **Hematopoietic Stem Cells (HSCs)** and **Mesenchymal Stem Cells (MSCs)** in adults [1]. HSCs are multipotent cells capable of differentiating into all blood cell lineages (erythroid, myeloid, and lymphoid) [1]. In clinical practice, bone marrow aspiration (typically from the iliac crest) remains a gold-standard source for stem cell harvesting used in transplants to treat various hematological malignancies and aplastic anemias [2]. **Analysis of Incorrect Options:** * **Skin (Option A):** While the skin contains epidermal stem cells (located in the "bulge" area of hair follicles), they are unipotent or bipotent, primarily responsible for skin regeneration [4]. They are not a standard source for systemic stem cell harvesting. * **Oral Mucosa (Option C):** This tissue contains progenitor cells for local epithelial repair, but it is not a recognized source for harvesting therapeutic stem cells for systemic use. * **Alimentary Tract (Option D):** The gastrointestinal tract has rapid turnover driven by stem cells located in the crypts of Lieberkühn [4]. However, these are difficult to isolate and are not used for clinical transplantation. **High-Yield NEET-PG Pearls:** * **Sources of HSCs:** The three main clinical sources are **Bone Marrow**, **Peripheral Blood** (after mobilization with G-CSF), and **Umbilical Cord Blood** [3]. * **Markers:** The most important surface marker for identifying and quantifying Hematopoietic Stem Cells is **CD34+**. * **Potency:** Adult stem cells (like those in bone marrow) are **multipotent**, whereas embryonic stem cells are **pluripotent**. * **Plasticity:** The ability of an adult stem cell from one tissue to differentiate into cells of another tissue is known as **stem cell plasticity** (e.g., HSCs forming hepatocytes) [4]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Heart, pp. 588-589. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 584-585. [3] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 585-586. [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. 104-105.

Question 85: Increased functional demand on the heart produces an increased size of the myocardium by which of the following mechanisms?

A. Hyperplasia
B. Hypertrophy (Correct Answer)
C. Calcification
D. Fatty infiltration

Explanation: **Explanation:** The correct answer is **Hypertrophy**. **Mechanism of Hypertrophy:** Hypertrophy refers to an increase in the size of cells, resulting in an increase in the size of the organ [1]. In the heart, cardiac myocytes are **permanent cells**, meaning they have lost the capacity for cell division (mitosis) in postnatal life. When the heart faces increased functional demand (e.g., systemic hypertension or aortic stenosis), the myocytes cannot divide to share the load [3]. Instead, they adapt by synthesizing more intracellular proteins and myofilaments, leading to larger individual cells and a thickened myocardium [1]. **Why other options are incorrect:** * **Hyperplasia:** This is an increase in the *number* of cells. It occurs in tissues capable of replication (e.g., uterine smooth muscle during pregnancy) [2]. Since adult cardiac muscle cells cannot divide, hyperplasia does not occur in the myocardium [1]. * **Calcification:** This is the abnormal deposition of calcium salts. While it can occur in heart valves (e.g., calcific aortic stenosis), it is a sign of cell injury or aging, not a primary adaptive mechanism to increased demand. * **Fatty infiltration:** This involves the deposition of stromal fat between myocardial cells (often seen in the right ventricle). It is not a functional adaptation to increased workload and often occurs in obesity or aging. **NEET-PG High-Yield Pearls:** * **Pure Hypertrophy:** Occurs in Permanent cells (Cardiac muscle, Skeletal muscle, and Neurons). * **Hypertrophy + Hyperplasia:** Occurs simultaneously in Labile and Stable cells (e.g., Gravid uterus) [1]. * **Molecular Trigger:** Cardiac hypertrophy is often mediated by the induction of the **fetal gene program** (e.g., ANP secretion and switch from $\beta$-MHC to $\alpha$-MHC) [4]. * **Pathological vs. Physiological:** Exercise causes physiological hypertrophy (proportional), while hypertension causes pathological hypertrophy (often leading to fibrosis and failure) [1][3]. **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. 45-46. [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. 85-87. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Heart, p. 536. [4] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of Infancy and Childhood, pp. 535-536.

Question 86: Marfan syndrome is due to a mutation of which of the following proteins?

A. Collagen
B. Elastin
C. Fibrillin (Correct Answer)
D. Fibronectin

Explanation: **Explanation:** **Marfan Syndrome** is an autosomal dominant disorder of connective tissue caused by a mutation in the **FBN1 gene** located on chromosome **15q21**. This gene encodes **Fibrillin-1**, a glycoprotein that serves as the major structural component of microfibrils. These microfibrils act as a scaffold for the deposition of elastin and are essential for maintaining the structural integrity of tissues, particularly in the skeletal system, eyes, and cardiovascular system [1]. * **Why Fibrillin is correct:** Fibrillin-1 not only provides structural support but also regulates **TGF-β signaling** [2]. Mutations lead to decreased microfibril formation and excessive TGF-β activation, causing weakened connective tissue and the characteristic clinical features (e.g., arachnodactyly, ectopia lentis, and aortic root dilation) [2]. **Analysis of Incorrect Options:** * **Collagen:** Mutations in collagen lead to disorders like **Osteogenesis Imperfecta** (Type I collagen) or **Ehlers-Danlos Syndrome** (various types), but not Marfan syndrome. * **Elastin:** While elastin is associated with fibrillin in elastic fibers [1], primary mutations in the elastin gene (ELN) result in **Williams syndrome** or supravalvular aortic stenosis. * **Fibronectin:** This is an adhesive glycoprotein involved in cell adhesion and wound healing; it is not the primary defect in Marfan syndrome. **High-Yield Clinical Pearls for NEET-PG:** * **Cardiovascular:** Most common cause of death is **Aortic Dissection** (preceded by cystic medial necrosis). * **Ocular:** **Ectopia lentis** (dislocation of the lens) typically occurs **upward and outward** (superior-temporal). * **Skeletal:** High-arched palate, pectus excavatum, and a positive **Walker-Murdoch sign** (wrist sign). * **Inheritance:** 75% familial (Autosomal Dominant), 25% sporadic mutations. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. With Illustrations By, pp. 35-36. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Genetic Disorders, pp. 153-154.

Question 87: Which CD marker is expressed by NK cells?

A. CD 3
B. CD 56 (Correct Answer)
C. CD 19
D. CD 13

Explanation: **Explanation:** Natural Killer (NK) cells are a subset of innate lymphoid cells that play a critical role in the host defense against viral infections and tumor surveillance [1]. **Why CD 56 is correct:** **CD 56** (Neural Cell Adhesion Molecule or NCAM) is the characteristic phenotypic marker used to identify **NK cells** in clinical practice and flow cytometry. Along with **CD 16** (an Fc receptor for IgG), CD 56 defines the NK cell population. NK cells are unique because they are "large granular lymphocytes" that lack the T-cell receptor (TCR) complex [1]. **Analysis of Incorrect Options:** * **CD 3:** This is the pan-T-cell marker [1]. It is part of the T-cell receptor (TCR) complex. Its absence is a key feature used to distinguish NK cells (CD3 negative) from NKT cells (CD3 positive). * **CD 19:** This is a primary marker for **B-cells** [1]. It is expressed from the early stages of B-cell development until the plasma cell stage. * **CD 13:** This is a **myeloid marker**, typically expressed on granulocytes, monocytes, and their precursors. It is frequently used in the diagnosis of Acute Myeloid Leukemia (AML). **High-Yield Clinical Pearls for NEET-PG:** * **NK Cell Markers:** CD 16, CD 56, and CD 94. * **Mechanism of Action:** NK cells kill target cells via **perforins and granzymes**, inducing apoptosis. * **Inhibitory Receptors:** NK cells express **KIR (Killer-cell Immunoglobulin-like Receptors)**, which recognize MHC Class I molecules on healthy cells to prevent "self-attack" [1]. * **Cytokine Activation:** NK cell activity is significantly enhanced by **IL-2 and IL-12** [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of the Immune System, pp. 200-201.

Question 88: What is the primary role of P-selectin in the process of inflammation?

A. Rolling of leukocytes along the vascular endothelium (Correct Answer)
B. Stable adhesion of leukocytes to the vascular endothelium
C. Directing leukocytes to specific lymphoid tissues
D. Movement of leukocytes across the vascular endothelium

Explanation: ### Explanation The recruitment of leukocytes to the site of inflammation is a multi-step process known as the **Leukocyte Adhesion Cascade**. **1. Why Option A is Correct:** **P-selectin** (along with E-selectin) is responsible for the **Rolling** phase [1]. Selectins are carbohydrate-binding adhesion molecules. P-selectin is stored in the **Weibel-Palade bodies** of endothelial cells and is rapidly redistributed to the cell surface upon stimulation by mediators like histamine or thrombin. It binds to **Sialyl-Lewis X** ligands on leukocytes, creating weak, transient bonds that cause the cells to "roll" along the vessel wall, slowing them down for subsequent steps. **2. Why the Other Options are Incorrect:** * **Option B (Stable Adhesion):** This step is mediated by **Integrins** (e.g., LFA-1, VLA-4) on leukocytes binding to **ICAM-1** and **VCAM-1** on the endothelium [1]. * **Option C (Homing to Lymphoid Tissues):** This is primarily the role of **L-selectin**, which is expressed on leukocytes and facilitates their entry into high endothelial venules (HEVs) of lymph nodes [1]. * **Option D (Transmigration/Diapedesis):** The movement across the endothelium is mediated by **PECAM-1 (CD31)**, located at the intercellular junctions of endothelial cells. **High-Yield NEET-PG Pearls:** * **Storage:** P-selectin is stored in **Weibel-Palade bodies** (which also store von Willebrand factor). * **Deficiency:** A defect in the synthesis of Sialyl-Lewis X (the ligand for selectins) leads to **Leukocyte Adhesion Deficiency (LAD) Type 2**, characterized by recurrent infections and a lack of pus formation. * **Sequence:** Rolling (Selectins) [1] → Activation (Chemokines) → Adhesion (Integrins) [1] → Transmigration (PECAM-1). **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Inflammation and Repair, p. 87.

Question 89: Which of the following conditions is characterized by epithelioid granulomas?

A. Sarcoidosis (Correct Answer)
B. Eosinophilia
C. Tuberculosis
D. Mycosis Fungoides

Explanation: **Explanation:** The hallmark of **Sarcoidosis** is the presence of **non-caseating epithelioid granulomas** [3]. A granuloma is a focal collection of inflammatory cells, primarily consisting of activated macrophages that have transformed into "epithelioid cells" (so named for their resemblance to epithelial cells with abundant pink cytoplasm) [2], surrounded by a rim of lymphocytes and occasionally multinucleated giant cells [1][2]. **Analysis of Options:** * **A. Sarcoidosis (Correct):** It is the classic example of a systemic disease characterized by well-formed, non-caseating granulomas [1]. High-yield microscopic findings include **Schumann bodies** (laminated calcium concretions) and **Asteroid bodies** (stellate inclusions within giant cells). * **B. Eosinophilia:** This refers to an increased count of eosinophils in the blood or tissues, typically associated with Type I hypersensitivity (allergies) or parasitic infections, not granulomatous inflammation. * **C. Tuberculosis:** While TB is a granulomatous disease, it is classically characterized by **caseating** (cheesy, necrotic center) granulomas. While the question asks for "epithelioid granulomas," Sarcoidosis is the more specific answer for "pure" epithelioid granulomas without central necrosis. * **D. Mycosis Fungoides:** This is a cutaneous T-cell lymphoma. Histologically, it is characterized by **Pautrier’s microabscesses** (clusters of malignant T-cells in the epidermis), not granulomas. **NEET-PG High-Yield Pearls:** * **Epithelioid cells** are derived from **CD14+ monocytes/macrophages** under the influence of **IFN-gamma** [2]. * **Non-caseating granulomas** are also seen in Crohn’s disease, Berylliosis, and Cat-scratch disease [1]. * **Kveim-Siltzbach test** (though largely historical) was used for Sarcoidosis diagnosis. * The most common site of involvement in Sarcoidosis is the **lung and intrathoracic lymph nodes** (bilateral hilar lymphadenopathy) [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. 198-200. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Inflammation and Repair, p. 109. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Lung, pp. 700-701.

Question 90: Which of the following are stable cells?

A. The lining mucosa of the glands
B. Mesenchymal cells (Correct Answer)
C. Nerve cells
D. Stratified squamous epithelium of the oral cavity

Explanation: **Explanation:** The classification of cells based on their proliferative capacity (Labile, Stable, and Permanent) is a fundamental concept in cell injury and repair [3]. **Correct Answer: B. Mesenchymal Cells** Stable cells (Quiescent cells) are those that normally have a low level of replication but can undergo rapid division in response to stimuli, such as injury or loss of tissue mass [3]. They are considered to be in the **G0 phase** of the cell cycle but can be recruited into the **G1 phase** [3]. Mesenchymal cells (including fibroblasts, osteoblasts, and chondrocytes), as well as vascular endothelial cells and parenchymal cells of solid organs (liver, kidney, pancreas), fall into this category [1]. **Analysis of Incorrect Options:** * **A & D (Lining mucosa and Stratified squamous epithelium):** These are **Labile cells**. They are continuously dividing to replace cells that are constantly being lost [3]. They follow a continuous cell cycle (never entering G0) and have a high regenerative capacity [2]. * **C (Nerve cells):** These are **Permanent cells**. They are terminally differentiated and non-proliferative in postnatal life [3]. Once destroyed, they are replaced by non-functional scar tissue (gliosis). Cardiac myocytes and skeletal muscle cells are also permanent cells [3]. **High-Yield NEET-PG Pearls:** * **Cell Cycle Phase:** Labile (always in cycle), Stable (G0 phase), Permanent (left the cycle) [3]. * **Liver Regeneration:** The liver is the classic example of stable cell regeneration (compensatory hyperplasia) following a partial hepatectomy [4]. * **Stem Cells:** Labile cells regenerate from stem cells (e.g., hematopoietic stem cells in bone marrow or basal layer of the skin) [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. 108-109. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Inflammation and Repair, pp. 113-115. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. With Illustrations By, pp. 37-38. [4] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Inflammation and Repair, p. 113.

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