General Pathology — MCQs

General Pathology Indian Medical PG Practice Questions and MCQs

Question 1241: Which of the following is a known effect of bradykinin?

A. Vasoconstriction
B. Pain at the site of inflammation (Correct Answer)
C. Bronchodilatation
D. Decreased vascular permeability

Explanation: **Explanation:** Bradykinin is a potent inflammatory mediator belonging to the **Kinin system**. It is derived from high-molecular-weight kininogen (HMWK) through the action of the enzyme kallikrein [1]. **Why the correct answer is right:** Bradykinin is one of the primary chemical mediators responsible for the sensation of **pain** during acute inflammation (along with prostaglandins) [1]. It acts by sensitizing and stimulating nociceptors (sensory nerve endings) at the site of injury. **Analysis of incorrect options:** * **A. Vasoconstriction:** Bradykinin is a powerful **vasodilator**, not a vasoconstrictor [1]. It acts on endothelial cells to release nitric oxide and PGI2, leading to smooth muscle relaxation. * **C. Bronchodilatation:** Bradykinin causes **bronchoconstriction** (contraction of bronchial smooth muscle) [1]. This is particularly relevant in allergic reactions and asthma. * **D. Decreased vascular permeability:** Bradykinin significantly **increases vascular permeability** by causing endothelial cell contraction, leading to the formation of intercellular gaps (exudation/edema) [1]. **High-Yield NEET-PG Pearls:** * **The "Triple Response" of Bradykinin:** Vasodilation, increased vascular permeability, and pain. * **ACE Inhibitor Link:** Angiotensin-Converting Enzyme (ACE) normally degrades bradykinin [1]. Therefore, ACE inhibitors lead to increased bradykinin levels, which can cause the classic side effects of **dry cough** and **angioedema**. * **C1 Esterase Inhibitor Deficiency:** This leads to Hereditary Angioedema due to the overproduction of bradykinin. * **Short Half-life:** Bradykinin is rapidly inactivated by kinases (like kininase II/ACE) [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Inflammation and Repair, pp. 100-101.

Question 1242: Coagulative necrosis is commonly seen in all except:

A. Tuberculosis
B. Encephalitis (Correct Answer)
C. Sarcoidosis
D. Wet gangrene

Explanation: **Explanation:** The correct answer is **Encephalitis (Option B)**. **Core Concept:** Coagulative necrosis is the most common pattern of cell death, characterized by the preservation of the basic structural outline of the tissue for several days [2]. This occurs because the injury denatures not only structural proteins but also the enzymes responsible for proteolysis (autolysis) [2]. However, the **Central Nervous System (CNS)** is the major exception to this rule. Ischemic or inflammatory injury to the brain (such as encephalitis or stroke) results in **Liquefactive Necrosis**. This is due to the high lipid content of the brain and the abundance of lysosomal enzymes in microglial cells [1], which rapidly digest the tissue into a liquid viscous mass. **Analysis of Options:** * **Tuberculosis (A) & Sarcoidosis (C):** These are characterized by **Granulomatous inflammation**. While TB typically shows *Caseous necrosis* (a subtype of coagulative necrosis with a "cheese-like" appearance), the underlying framework is a modified form of coagulative necrosis. In many MCQ formats, if liquefactive necrosis (CNS) is an option, it is the "more correct" exception. * **Wet Gangrene (D):** Gangrenous necrosis is essentially coagulative necrosis (due to loss of blood supply) involving multiple tissue layers. When a bacterial infection is superimposed, it becomes "wet" gangrene, which adds a liquefactive component, but the primary underlying process in gangrene is coagulative. **NEET-PG High-Yield Pearls:** * **Coagulative Necrosis:** Seen in all solid organ infarcts (Heart, Kidney, Spleen) **EXCEPT** the Brain. * **Liquefactive Necrosis:** Seen in Brain infarcts/infections and Abscesses (due to neutrophils). * **Fat Necrosis:** Classic in Acute Pancreatitis (enzymatic) and Breast trauma (non-enzymatic). * **Fibrinoid Necrosis:** Seen in immune-mediated vascular damage (e.g., Polyarteritis Nodosa, Malignant Hypertension). **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Peripheral Nerves and Skeletal Muscles, pp. 1255-1256. [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. 51-53.

Question 1243: Which of the following inflammatory mediators does not cause fever?

A. Nitric oxide (Correct Answer)
B. Prostaglandin
C. IL-1
D. TNF-alpha

Explanation: ### Explanation The correct answer is **Nitric oxide (A)**. **1. Why Nitric Oxide is the correct answer:** Fever (pyrexia) is primarily mediated by **pyrogens**. Nitric oxide (NO) is a potent vasodilator and a free radical involved in microbial killing and vascular permeability, but it does not act on the thermoregulatory center of the hypothalamus to raise body temperature [1]. In fact, in the context of septic shock, excessive NO production leads to severe hypotension rather than being a direct mediator of the febrile response. **2. Why the other options are incorrect:** * **Prostaglandins (PGE2):** This is the ultimate mediator of fever [1]. Cytokines stimulate the perivascular cells of the hypothalamus to produce PGE2, which resets the hypothalamic thermostat to a higher level. Aspirin and NSAIDs reduce fever by inhibiting the cyclooxygenase (COX) enzyme responsible for PGE2 synthesis. * **IL-1 and TNF-alpha:** These are **endogenous pyrogens** [1]. They are released by macrophages in response to bacterial products (like LPS/endotoxins). They travel through the bloodstream to the hypothalamus, where they induce the production of PGE2. **3. NEET-PG High-Yield Pearls:** * **Exogenous Pyrogen:** Bacterial Lipopolysaccharide (LPS) is the most common example. * **Endogenous Pyrogens:** IL-1, TNF-α, and IL-6 [1]. * **The "Master Mediator" of Fever:** Prostaglandin E2 (PGE2) [1]. * **Nitric Oxide Functions:** Vasodilation (via cGMP), inhibition of platelet aggregation, and microbicidal activity (via reactive nitrogen species) [1]. It is produced by the enzyme Nitric Oxide Synthase (NOS). **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Inflammation and Repair, pp. 91, 95-96, 101.

Question 1244: What is a characteristic of exudative fluid?

A. Low protein content
B. Specific gravity < 1.012
C. Normal vascular permeability
D. Cellular debris (Correct Answer)

Explanation: ### Explanation The fundamental difference between an **exudate** and a **transudate** lies in the mechanism of fluid formation. An exudate is the result of **increased vascular permeability** caused by inflammation [2]. **Why "Cellular Debris" is correct:** In inflammatory states, the gaps between endothelial cells widen, allowing large molecules and cells to escape the intravascular space. Exudative fluids are typically "cloudy" or "turbid" because they contain high concentrations of proteins, white blood cells (leukocytes), and **cellular debris** resulting from tissue injury or the inflammatory process itself [1, 2]. **Analysis of Incorrect Options:** * **A. Low protein content:** Incorrect. Exudates have **high protein content** (>3 g/dL) because the leaky capillary membrane allows albumin and globulins to pass through. * **B. Specific gravity < 1.012:** Incorrect. Due to the high concentration of proteins and cells, the specific gravity of an exudate is **high (>1.020)**. A specific gravity < 1.012 is characteristic of a transudate. * **C. Normal vascular permeability:** Incorrect. Exudates occur specifically when vascular permeability is **increased** (e.g., infection, malignancy) [2]. Normal permeability with altered hydrostatic or oncotic pressure leads to a transudate (e.g., Congestive Heart Failure). **High-Yield NEET-PG Pearls:** * **Light’s Criteria:** Used to distinguish pleural exudates. A fluid is an exudate if: 1. Effusion protein / Serum protein ratio **> 0.5** 2. Effusion LDH / Serum LDH ratio **> 0.6** 3. Effusion LDH **> 2/3rd** the upper limit of normal serum LDH. * **Mechanism:** Transudate = Pressure imbalance; Exudate = Inflammation/Membrane damage. * **Fibrin:** Exudates often contain fibrinogen, which can clot; transudates do not [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. 192-193. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Inflammation and Repair, pp. 85-86. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Inflammation and Repair, pp. 101-103.

Question 1245: Which autoantibody is associated with Sjögren's syndrome?

A. Anti centromere antibody
B. Anti Ro and Anti La antibodies (Correct Answer)
C. Anti ds DNA antibody
D. Anti RNP antibody

Explanation: **Explanation:** Sjögren's syndrome is a chronic autoimmune disorder characterized by lymphocytic infiltration of exocrine glands, primarily leading to keratoconjunctivitis sicca (dry eyes) and xerostomia (dry mouth) [1]. **Why Option B is Correct:** The hallmark autoantibodies for Sjögren's syndrome are **Anti-Ro (SS-A)** and **Anti-La (SS-B)** [1]. These are directed against ribonucleoprotein antigens. Anti-Ro is found in about 60-90% of patients, while Anti-La is found in approximately 30-60%. Their presence is a key diagnostic criterion and is often associated with earlier disease onset, longer duration, and extraglandular manifestations (like vasculitis). **Analysis of Incorrect Options:** * **A. Anti-centromere antibody:** Highly specific for **Limited Cutaneous Systemic Sclerosis** (formerly CREST syndrome). * **C. Anti-dsDNA antibody:** Highly specific for **Systemic Lupus Erythematosus (SLE)** and correlates with disease activity and lupus nephritis. * **D. Anti-RNP antibody:** The defining serological marker for **Mixed Connective Tissue Disease (MCTD)**. **High-Yield Clinical Pearls for NEET-PG:** * **Schirmer’s Test:** Used to quantify decreased tear production. * **Lip Biopsy:** The gold standard for diagnosis, showing focal lymphocytic sialadenitis in minor salivary glands [1]. * **Malignancy Risk:** Patients with Sjögren's syndrome have a 40-fold increased risk of developing **B-cell Non-Hodgkin Lymphoma** (specifically MALT lymphoma) [1]. * **Neonatal Lupus:** Pregnant women with Anti-Ro/SSA antibodies are at risk of having infants with neonatal lupus and **congenital heart block**. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of the Immune System, pp. 234-236.

Question 1246: Fatty change is typically seen in which of the following organs?

A. Brain
B. Kidney (Correct Answer)
C. Adrenal
D. Bladder

Explanation: **Explanation:** **Fatty change (Steatosis)** refers to the abnormal accumulation of triglycerides within parenchymal cells [1]. It is a manifestation of reversible cell injury [1]. **1. Why Kidney is Correct:** Fatty change occurs in organs that are heavily involved in **lipid metabolism** [1]. While the **liver** is the most common site, the **kidney** and **heart** are also frequently affected [1]. In the kidney, lipid vacuoles are typically seen in the cells of the **proximal convoluted tubules (PCT)**. This occurs due to increased delivery of free fatty acids or toxic injury (e.g., hypoxia, chemicals) that impairs the cell's ability to metabolize or export lipids [2]. **2. Analysis of Incorrect Options:** * **A. Brain:** The brain is rich in lipids (myelin), but it does not undergo "fatty change" as a form of reversible injury. Injury to the brain typically results in **liquefactive necrosis**. * **C. Adrenal:** The adrenal cortex normally contains high amounts of cholesterol for steroid synthesis (often appearing "clear" or foamy), but this is a physiological state, not the pathological process of steatosis. * **D. Bladder:** The urinary bladder consists primarily of transitional epithelium and smooth muscle, which are not involved in significant lipid metabolism; therefore, they do not exhibit fatty change. **3. NEET-PG High-Yield Pearls:** * **Most common organ:** Liver (due to its central role in fat metabolism) [2]. * **Stains for Fat:** Since routine H&E processing dissolves fat (leaving clear vacuoles), special stains on **frozen sections** are required: **Sudan IV, Sudan Black, and Oil Red O**. * **Heart Involvement:** Presents in two patterns: **"Tigered effect"** (striated appearance due to prolonged hypoxia) and uniform involvement (due to profound toxemia/diphtheria). * **Etiology:** Alcohol is the most common cause of fatty liver in developed nations; protein-energy malnutrition (Kwashiorkor) and Diabetes Mellitus are other major causes [2]. **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. 51-53. [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, p. 73.

Question 1247: Protein level more than 4-5 g/100ml is seen in all of the following except:

A. Dentigerous cyst.
B. Odontogenic keratocyst (OKC). (Correct Answer)
C. Radicular cyst.
D. None of the above.

Explanation: This question tests the biochemical differentiation between odontogenic cysts based on their luminal contents, a high-yield topic in oral pathology. ### **Core Concept: Cystic Fluid Protein Levels** The protein content of cystic fluid is primarily determined by the nature of the cyst lining and the mechanism of fluid accumulation. Most inflammatory and developmental cysts (like Dentigerous and Radicular cysts) act as semi-permeable membranes, allowing serum proteins to leak into the lumen, resulting in high protein levels (typically **>5 g/100ml**). ### **Why Odontogenic Keratocyst (OKC) is the Correct Answer** In contrast to other cysts, the **Odontogenic Keratocyst (OKC)** is characterized by a low soluble protein level, usually **less than 4 g/100ml**. This occurs because the OKC lining is a highly keratinized, thick stratified squamous epithelium that acts as an effective barrier, preventing the passive diffusion of serum proteins. Furthermore, the OKC grows via cellular proliferation rather than osmotic pressure. ### **Analysis of Incorrect Options** * **A. Dentigerous Cyst:** This is a developmental cyst where fluid accumulates between the reduced enamel epithelium and the tooth crown. The lining is thin and non-keratinized, allowing significant protein exudation (>5 g/100ml). * **C. Radicular Cyst:** Being an inflammatory cyst, it involves an active inflammatory exudate. The increased capillary permeability leads to very high protein concentrations, often exceeding 5-7 g/100ml. ### **NEET-PG High-Yield Pearls** * **OKC Protein:** <4 g/100ml (Diagnostic marker). * **Aspiration Cytology:** OKC fluid often contains **keratin squames** and has a "cheesy" or "creamy" appearance. * **Electrophoresis:** OKC shows low albumin and globulin levels compared to Radicular or Dentigerous cysts. * **Clinical Significance:** Low protein levels in OKC help differentiate it from the more aggressive Ameloblastoma or other odontogenic cysts during preoperative diagnosis.

Question 1248: A patient is a known case of polyarteritis nodosa. On examination of a biopsy, accumulation of amorphous, eosinophilic, proteinaceous material in the vessel wall was seen. This finding is suggestive of:

A. Fibrinoid necrosis (Correct Answer)
B. Leukocytoclastic vasculitis
C. Hyaline arteriosclerosis
D. Caseous necrosis

Explanation: **Explanation:** The correct answer is **Fibrinoid Necrosis**. This is a specialized form of cell death typically seen in immune-mediated vascular damage. **Why it is correct:** In conditions like **Polyarteritis Nodosa (PAN)** or malignant hypertension, antigen-antibody complexes are deposited in the arterial walls [1]. These complexes, along with leaked plasma proteins (such as fibrin), create a distinct histological appearance [2]. Under the microscope, this manifests as a bright pink, **amorphous, eosinophilic, and proteinaceous** deposit that resembles fibrin, hence the term "fibrinoid." **Why other options are incorrect:** * **Leukocytoclastic vasculitis:** While this is a form of small-vessel vasculitis, the hallmark histological finding is "nuclear dust" (karyorrhexis) from infiltrating neutrophils, not just proteinaceous material [3]. * **Hyaline arteriosclerosis:** This involves the thickening of arteriolar walls seen in chronic hypertension or diabetes. While it appears pink and homogeneous, it is due to basement membrane thickening and plasma protein leakage, not the acute necrotizing inflammatory process characteristic of PAN. * **Caseous necrosis:** This is the "cheese-like" necrosis characteristic of Tuberculosis. It consists of fragmented cells and granular debris, typically enclosed within a granuloma, not localized to vessel walls. **High-Yield Clinical Pearls for NEET-PG:** * **Fibrinoid Necrosis** is classically associated with: **PAN, Aschoff bodies (Rheumatic heart disease), Malignant Hypertension, and Preeclampsia (placental vessels).** * **Polyarteritis Nodosa (PAN)** typically involves medium-sized muscular arteries and characteristically **spares the pulmonary circulation** [1]. * PAN is strongly associated with **Hepatitis B surface antigen (HBsAg)** in about 30% of cases. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of Infancy and Childhood, pp. 517-518. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Cardiovascular Disease, pp. 277-278. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of Infancy and Childhood, pp. 518-519.

Question 1249: Pathologic calcification is seen in which of the following conditions?

A. Scleroderma (Correct Answer)
B. Lichen planus
C. Dystrophic epidermolysis bullosa
D. Lupus erythematosus

Explanation: **Explanation:** The correct answer is **Scleroderma**. Pathologic calcification in this context refers specifically to **Dystrophic Calcification**, which occurs in damaged, necrotic, or degenerating tissues despite normal serum calcium and phosphate levels. **Why Scleroderma is correct:** In Systemic Sclerosis (Scleroderma), particularly the **Limited Cutaneous subtype (formerly CREST syndrome)**, dystrophic calcification is a hallmark feature [1]. The "C" in CREST stands for **Calcinosis Cutis**, where calcium salts are deposited in the skin and subcutaneous tissues due to chronic ischemia and tissue damage caused by microvascular injury and fibrosis [1], [2]. **Analysis of Incorrect Options:** * **Lichen Planus:** This is an inflammatory mucocutaneous condition characterized by "P"s (Planar, Purple, Polygonal, Pruritic, Papules). While it involves basal cell degeneration (Civatte bodies), it does not typically lead to tissue calcification. * **Dystrophic Epidermolysis Bullosa (DEB):** Although the name contains "dystrophic," it refers to the level of scarring and basement membrane involvement (anchoring fibrils) in this blistering disorder, not dystrophic calcification. * **Lupus Erythematosus:** While rare cases of calcinosis can occur in systemic lupus, it is not a classic or defining pathologic feature compared to the strong association seen in Scleroderma. **High-Yield Pearls for NEET-PG:** 1. **Dystrophic Calcification:** Serum calcium is **normal** [3]. Seen in: Areas of necrosis (caseous, liquefactive, fat), Atherosclerotic plaques, Damaged heart valves, and Psammoma bodies (Papillary thyroid CA, Serous cystadenocarcinoma of ovary, Meningioma) [3]. 2. **Metastatic Calcification:** Serum calcium is **elevated** [3]. Occurs in normal tissues, primarily affecting "acid-excreting" organs (Lungs, Kidneys, Gastric mucosa) due to an internal alkaline environment [4]. 3. **CREST Syndrome Components:** **C**alcinosis, **R**aynaud’s phenomenon, **E**sophageal dysmotility, **S**clerodactyly, **T**elangiectasia [1], [2]. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Osteoarticular And Connective Tissue Disease, pp. 689-690. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of the Immune System, p. 238. [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. 134-135. [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. 76-77.

Question 1250: What is the most common trisomy?

A. Trisomy 21
B. Trisomy 18
C. Trisomy 16 (Correct Answer)
D. Trisomy 13

Explanation: **Explanation:** The correct answer is **Trisomy 16**. While Trisomy 21 (Down Syndrome) is the most common trisomy observed in **live births** [1], Trisomy 16 is the most common trisomy occurring in **human conceptions** overall. **Why Trisomy 16 is correct:** Trisomy 16 is the most frequent chromosomal abnormality found in spontaneous abortions (miscarriages). It is estimated to occur in approximately 1% of all pregnancies but is virtually always lethal in its full form [3]. It typically results in early first-trimester pregnancy loss [3], which is why it is rarely seen in clinical practice outside of cytogenetic studies of products of conception. **Analysis of Incorrect Options:** * **Trisomy 21 (Down Syndrome):** This is the most common trisomy among **live-born infants** [1], [2]. Because it is compatible with life, it is often mistakenly thought to be the most common overall, but it occurs less frequently in total conceptions than Trisomy 16. * **Trisomy 18 (Edwards Syndrome):** The second most common autosomal trisomy in live births [1]. It is associated with severe malformations (clenched fists, rocker-bottom feet) and high infant mortality. * **Trisomy 13 (Patau Syndrome):** The third most common autosomal trisomy in live births [1]. It presents with midline defects like holoprosencephaly, cleft lip/palate, and polydactyly. **High-Yield Clinical Pearls for NEET-PG:** * **Most common cause of spontaneous abortion:** Chromosomal abnormalities (approx. 50%). * **Most common specific chromosomal anomaly in miscarriages:** Trisomy 16. * **Most common single chromosomal abnormality in miscarriages:** Monosomy X (Turner Syndrome, 45,X). Note the distinction: Trisomy 16 is the most common *trisomy*, but 45,X is the most common *single anomaly*. * **Risk Factor:** Advanced maternal age is the strongest risk factor for all autosomal trisomies due to non-disjunction during meiosis [2], [3]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Genetic Disorders, pp. 171-172. [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. 40-41. [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. 92-93.

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Cell Injury and Cell Death

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Adaptations of Cellular Growth

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Acute and Chronic Inflammation

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Hemodynamic Disorders

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Genetic Disorders

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Environmental Pathology

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Nutritional Diseases

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Molecular Basis of Disease

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