General Pathology — MCQs

General Pathology Indian Medical PG Practice Questions and MCQs

Question 961: Storiform pattern of tumor cells in histopathology is seen in which of the following tumors?

A. Retinoblastoma
B. Rhabdomyosarcoma
C. Fibrous histiocytoma (Correct Answer)
D. Medulloepithelioma

Explanation: ### Explanation **Correct Option: C. Fibrous histiocytoma** The term **"Storiform"** is derived from the Latin word *storea* (meaning a woven mat). In histopathology, it refers to a growth pattern where spindle-shaped cells (fibroblasts) are arranged in a radiating or cartwheel-like fashion around a central point. This pattern is the hallmark of **Dermatofibrosarcoma Protuberans (DFSP)** and **Benign Fibrous Histiocytoma (Dermatofibroma)** [1]. It occurs due to the proliferation of fibroblasts and histiocytes in a whorled, interlacing arrangement. **Analysis of Incorrect Options:** * **A. Retinoblastoma:** Characteristically shows **Flexner-Wintersteiner rosettes** (true rosettes with a central lumen) and Homer Wright rosettes. * **B. Rhabdomyosarcoma:** Typically shows a "cambium layer" (subepithelial crowding) in the botryoid variant or a "tadpole/strap cell" morphology. It does not exhibit a storiform pattern. * **D. Medulloepithelioma:** A rare primitive neuroepithelial tumor that typically shows tubular, canalicular, or papillary patterns mimicking the embryonic neural tube. **High-Yield Clinical Pearls for NEET-PG:** * **Storiform Pattern Differential:** Besides Fibrous Histiocytoma, it is classically seen in **DFSP** (Dermatofibrosarcoma Protuberans), where it is often described as a "cartwheel" or "pinwheel" pattern [1]. * **Rosette Review:** * **Homer Wright Rosettes:** Neuroblastoma, Medulloblastoma (pseudorosettes, no central lumen). * **Flexner-Wintersteiner Rosettes:** Retinoblastoma, Pinealoblastoma. * **Perivascular Pseudorosettes:** Ependymoma [2]. * **Schiller-Duval Bodies:** Pathognomonic for Yolk Sac Tumor. * **Psammoma Bodies:** Seen in Papillary Thyroid Carcinoma, Serous Cystadenocarcinoma of Ovary, and Meningioma. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Skin, pp. 1160-1162. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Peripheral Nerves and Skeletal Muscles, p. 1250.

Question 962: All of the following are intermediate filaments except?

A. Lamin
B. Cadherin (Correct Answer)
C. Vimentin
D. Desmin

Explanation: **Explanation:** The cytoskeleton of a cell consists of three main components: microfilaments (actin), microtubules (tubulin), and **intermediate filaments (IFs)**. Intermediate filaments (10 nm) provide structural stability to cells and are tissue-specific markers. **Why Cadherin is the correct answer:** **Cadherins** are not cytoskeletal filaments; they are **transmembrane cell adhesion molecules** (CAMs) [1]. They play a critical role in cell-cell adhesion by forming "adherens junctions" and "desmosomes." They are calcium-dependent proteins that link the internal cytoskeleton of one cell to another, but they do not function as intermediate filaments themselves [1]. **Why the other options are incorrect:** * **Lamin (Option A):** These are type V intermediate filaments found in the **nucleus** (nuclear lamina) of all nucleated cells. They provide structural support to the nuclear envelope. * **Vimentin (Option C):** This is the most common type III intermediate filament. It is the characteristic marker for cells of **mesenchymal origin** (e.g., fibroblasts, endothelium, and most sarcomas). * **Desmin (Option D):** Also a type III intermediate filament, desmin is specific to **muscle cells** (skeletal, cardiac, and smooth muscle). It links myofibrils together. **High-Yield Clinical Pearls for NEET-PG:** * **Cytokeratin:** IF marker for **Epithelial** cells (used to diagnose Carcinomas). * **GFAP (Glial Fibrillary Acidic Protein):** IF marker for **Astrocytes** and ependymal cells (used to diagnose Gliomas). * **Neurofilaments:** IF marker for **Neurons** (used to diagnose Pheochromocytoma or Neuroblastoma). * **Mallory Hyaline bodies** (seen in alcoholic liver disease) are composed of tangled **cytokeratin** intermediate filaments. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. With Illustrations By, pp. 23-24.

Question 963: Which mutation is most commonly associated with prostate carcinoma?

A. p16/INK4a
B. PTEN
C. GPST1 (Correct Answer)
D. APC

Explanation: **Explanation:** The correct answer is **GPST1** (Glutathione S-transferase P1). **Why GPST1 is correct:** In prostate carcinoma, the most frequent epigenetic alteration is the **hypermethylation of the GSTP1 gene promoter** [1]. This leads to the silencing of the gene, which normally encodes an enzyme that protects cells against oxidative stress and DNA damage from carcinogens. The loss of GSTP1 expression occurs in approximately 90% of prostate cancers and is also frequently seen in the precursor lesion, Prostatic Intraepithelial Neoplasia (PIN). **Analysis of Incorrect Options:** * **p16/INK4a (Option A):** This is a tumor suppressor gene primarily associated with **Melanoma** and Pancreatic carcinoma [3]. It regulates the cell cycle by inhibiting CDK4/6. * **PTEN (Option B):** While PTEN deletions are common in advanced or metastatic prostate cancer (occurring in about 30-50% of cases), **GSTP1 remains the most common** overall epigenetic change found in the vast majority of cases [2]. * **APC (Option C):** Mutations in the APC (Adenomatous Polyposis Coli) gene are the hallmark of **Familial Adenomatous Polyposis (FAP)** and are associated with colorectal carcinoma, not primarily prostate cancer. **High-Yield Clinical Pearls for NEET-PG:** * **Most common genetic rearrangement:** Fusion of the **TMPRSS2** (androgen-regulated gene) and **ETS family transcription factors** (specifically **ERG**) is found in ~50% of prostate cancers [2]. * **Precursor lesion:** High-grade Prostatic Intraepithelial Neoplasia (HGPIN). * **Metastasis:** Prostate cancer characteristically spreads to the bone (lumbar spine) causing **osteoblastic** (bone-forming) lesions [2]. * **Tumor Marker:** PSA (Prostate-Specific Antigen) is organ-specific but not cancer-specific. **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. 230-231. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Lower Urinary Tract and Male Genital System, pp. 993-994. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Pancreas, pp. 897-898.

Question 964: In which type of necrosis is tissue architecture preserved?

A. Liquefaction necrosis
B. Coagulative necrosis (Correct Answer)
C. Fat necrosis
D. All of the above

Explanation: **Explanation:** **Coagulative necrosis** is the correct answer because it is characterized by the **preservation of basic tissue architecture** for at least several days [1]. The underlying mechanism involves the denaturation of not only structural proteins but also enzymatic proteins. This denaturation blocks the proteolysis (digestion) of the dead cells; as a result, firm, opaque, "ghost-like" cell outlines persist without nuclei until phagocytes eventually clear the debris [1]. **Why other options are incorrect:** * **Liquefaction necrosis:** In contrast to coagulative necrosis, the tissue is completely digested by hydrolytic enzymes, transforming it into a liquid viscous mass (pus). The architecture is entirely lost. This is typically seen in focal bacterial infections or brain infarcts. * **Fat necrosis:** This refers to focal areas of fat destruction, typically resulting from the release of activated pancreatic lipases [1]. It results in the formation of "chalky white" calcium deposits (saponification), which destroys the original cellular structure [1]. **High-Yield Clinical Pearls for NEET-PG:** * **Most Common Type:** Coagulative necrosis is the most common pattern of necrosis. * **Etiology:** It is characteristic of **hypoxic/ischemic death** in all solid organs **except the brain**. * **Microscopic Hallmark:** "Ghost cells" (cells with preserved outlines but loss of nuclei/organelles) [1]. * **Macroscopic Hallmark:** The affected area is typically firm and pale (infarct) [1]. * **Key Exception:** Ischemia in the **Central Nervous System (CNS)** results in liquefaction necrosis, not coagulative necrosis. **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. 53-55.

Question 965: Which interleukin is responsible for causing pyrexia?

A. IL1 (Correct Answer)
B. IL6
C. Interferon gamma
D. Interferon alpha

Explanation: **Explanation:** **IL-1 (Interleukin-1)** is the primary endogenous pyrogen responsible for inducing fever (pyrexia) [1]. When the body encounters pathogens or inflammatory stimuli, macrophages and other immune cells release IL-1. This cytokine travels through the bloodstream to the hypothalamus, where it stimulates the synthesis of **Prostaglandin E2 (PGE2)** via the induction of the cyclooxygenase (COX) enzyme [1]. PGE2 then resets the hypothalamic thermostat to a higher level, resulting in fever. **Analysis of Options:** * **IL-1 (Correct):** Known as the "master" endogenous pyrogen. Along with TNF-α, it is the most potent inducer of the febrile response [1]. * **IL-6:** While IL-6 is a major mediator of the **acute-phase response** (stimulating the liver to produce CRP, fibrinogen, and hepcidin), it is considered a secondary pyrogen compared to the direct action of IL-1 [1]. * **Interferon-gamma (IFN-γ):** Primarily involved in activating macrophages (Type IV hypersensitivity) and antiviral responses; it does not play a primary role in the central induction of fever. * **Interferon-alpha (IFN-α):** Mainly functions in antiviral defense by inhibiting viral replication in neighboring cells. **High-Yield Clinical Pearls for NEET-PG:** * **Pyrogen Hierarchy:** The most important endogenous pyrogens are **IL-1, TNF-α, and IL-6** [1]. * **Exogenous Pyrogens:** The most common example is **LPS (Lipopolysaccharide)** from Gram-negative bacteria, which triggers the release of IL-1. * **Mechanism of Action:** Antipyretics like Paracetamol and NSAIDs reduce fever by inhibiting the COX enzyme, thereby blocking the synthesis of PGE2 in the hypothalamus [1]. * **Acute Phase Reactants:** Remember that **IL-6** is the chief stimulator for the production of C-Reactive Protein (CRP) [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Inflammation and Repair, pp. 110-111.

Question 966: Which of the following is an example of a non-dividing/permanent cell?

A. Hepatocyte
B. Lymphocyte
C. Respiratory epithelium
D. Neuron (Correct Answer)

Explanation: The classification of cells based on their proliferative capacity (the Cell Cycle) is a high-yield topic in General Pathology. Cells are categorized into three types: Labile, Stable, and Permanent. **1. Why the Correct Answer is Right:** **Neurons (Option D)** are classified as **Permanent (Non-dividing) cells** [1]. These cells have exited the cell cycle and are considered to be in a terminal differentiated state (G0 phase). They cannot undergo mitotic division in postnatal life. Therefore, any injury to the central nervous system results in healing by fibrosis (gliosis) rather than regeneration. Other examples include cardiac myocytes and skeletal muscle cells [1]. **2. Why the Incorrect Options are Wrong:** * **Hepatocytes (Option A):** These are **Stable (Quiescent) cells**. They normally reside in the G0 phase but retain the capacity to re-enter the cell cycle (G1 phase) in response to injury or loss of tissue mass (e.g., partial hepatectomy). * **Lymphocytes (Option B):** These are also **Stable cells**. While they are mature cells, they can rapidly proliferate when stimulated by specific antigens. * **Respiratory Epithelium (Option C):** This is an example of **Labile (Continuously dividing) cells**. These cells are constantly being lost and replaced by maturation from stem cells and rapid proliferation. Other examples include the epidermis and GI tract lining. **Clinical Pearls for NEET-PG:** * **Regeneration vs. Repair:** Only labile and stable cells can undergo *regeneration*. Permanent cells can only undergo *repair* (scarring/fibrosis). * **Cardiac Exception:** While cardiac myocytes are permanent, recent research suggests very limited turnover, but for exam purposes, they remain the classic example of non-dividing cells alongside neurons [1]. * **Stem Cells:** The regenerative capacity of stable and labile cells is dependent on the preservation of the underlying **extracellular matrix (ECM)** and the presence of tissue stem cells. **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. 78-79.

Question 967: Metastatic calcification is seen in:

A. Cysts
B. Atheroma
C. Normal tissues (Correct Answer)
D. Infarcts

Explanation: **Explanation:** Pathologic calcification is the abnormal deposition of calcium salts in tissues. It is categorized into two types: **Dystrophic** and **Metastatic**. **Why "Normal Tissues" is correct:** Metastatic calcification occurs in **normal (viable) tissues** due to a disturbance in calcium metabolism, specifically **hypercalcemia** [1]. When serum calcium levels are elevated (due to hyperparathyroidism, Vitamin D toxicity, or bone destruction), calcium salts precipitate into healthy tissues [1], [2]. It primarily affects interstitial tissues of the gastric mucosa, kidneys, lungs, and systemic arteries because these sites lose acid, creating an internal alkaline environment that favors calcium deposition [3]. **Why the other options are incorrect:** * **A, B, and D (Cysts, Atheroma, Infarcts):** These represent areas of dead, dying, or degenerated tissue. Calcification occurring in damaged or necrotic tissue despite **normal** serum calcium levels is termed **Dystrophic calcification**. * **Atheroma:** Advanced atherosclerosis often undergoes dystrophic calcification. * **Infarcts:** Areas of ischemic necrosis (e.g., old infarcts) are classic sites for dystrophic calcification. * **Cysts:** Long-standing cysts (like a sebaceous cyst) often show calcification in their walls due to chronic inflammation/degeneration. **High-Yield NEET-PG Pearls:** * **Dystrophic Calcification:** Serum calcium is normal; occurs in necrotic tissue (e.g., Psammoma bodies, Monckeberg’s sclerosis, Caseous necrosis). * **Metastatic Calcification:** Serum calcium is elevated; occurs in healthy tissue [1]. * **Morphology:** On H&E stain, both types appear as **basophilic (blue/purple)**, amorphous granular clumps [3]. * **Special Stains:** Von Kossa (turns black) and Alizarin Red S (turns red). **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. 134-135. [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. 127-128. [3] 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 968: All of the following statements about the typical features of a periapical granuloma are true EXCEPT?

A. It consists of proliferating granulation tissue
B. It can form only if the periapical bone is resorbed
C. It shows evidence of local antibody production (Correct Answer)
D. It results from immunologically mediated tissue damage

Explanation: ### Explanation **1. Why Option C is the Correct Answer (The "Except" Statement):** In the context of standard pathology textbooks (like Shafer’s) and competitive exams, the periapical granuloma is primarily characterized as a **Type IV hypersensitivity reaction** (cell-mediated immunity) [3]. While plasma cells are present in the lesion, the hallmark of a periapical granuloma is the presence of granulation tissue and a chronic inflammatory infiltrate (macrophages, lymphocytes). The statement regarding "local antibody production" is traditionally considered less characteristic or a "distractor" compared to the definitive features of granulation tissue and bone resorption. In many classic MCQ banks, this is identified as the "incorrect" feature because the lesion is defined more by its **cellular response** than a humoral (antibody) secretory function. **2. Analysis of Incorrect Options:** * **Option A (Proliferating granulation tissue):** This is a **true** statement. By definition, a periapical granuloma is a mass of chronically inflamed granulation tissue at the apex of a non-vital tooth [1]. * **Option B (Periapical bone resorption):** This is a **true** statement. For a granuloma to form and expand at the apex, the surrounding alveolar bone must undergo resorption (mediated by osteoclasts) to create space for the inflammatory tissue. * **Option D (Immunologically mediated tissue damage):** This is a **true** statement. The lesion is a result of the body’s immune response to bacterial toxins and breakdown products from a necrotic pulp, involving both innate and adaptive (Type IV) immunity [3]. **3. Clinical Pearls for NEET-PG:** * **Radiographic Appearance:** Appears as a well-defined, unilocular radiolucency at the apex of a non-vital tooth. * **Histology:** Look for **Rushton bodies** (in the epithelium of associated cysts) and **Cholesterol clefts** with giant cells. * **Sequelae:** If left untreated, the stimulation of **Rest cells of Malassez** within the granuloma can lead to the formation of a **Radicular Cyst** (the most common inflammatory odontogenic cyst). * **Key Difference:** Unlike a true "granuloma" (like TB), a periapical granuloma is actually **granulation tissue**, not necessarily a collection of epithelioid histiocytes [1], [2]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Head and Neck, pp. 741-742. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Inflammation and Repair, p. 109. [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. 173-174.

Question 969: Which of the following does not occur in lysosomal storage disorders?

A. Increased number and size of lysosomes
B. Accumulation of polyubiquinated proteins
C. No neurological deficit (Correct Answer)
D. Apoptosis defects

Explanation: **Explanation:** Lysosomal Storage Disorders (LSDs) are a group of approximately 50 genetic diseases characterized by a deficiency of specific lysosomal enzymes, leading to the accumulation of undigested substrates [1]. **Why Option C is the Correct Answer:** The statement "No neurological deficit" is incorrect because **neurological involvement is a hallmark of most LSDs.** Since the brain is highly metabolic and dependent on lysosomal degradation for cellular homeostasis, the accumulation of substrates (like sphingolipids or mucopolysaccharides) leads to progressive neurodegeneration, developmental delay, and seizures [1], [2]. For example, Tay-Sachs and Gaucher Type 2/3 present with severe CNS symptoms [1], [4]. **Analysis of Incorrect Options:** * **Option A:** Due to the enzyme deficiency, undigested metabolites accumulate within the lysosomes. This leads to an **increase in both the number and size of lysosomes** (forming "distended" lysosomes), which is the primary morphological feature of these diseases [3], [4]. * **Option B:** Defective lysosomal function impairs autophagy. This leads to the buildup of damaged organelles and **polyubiquitinated proteins** that would normally be degraded, contributing to cellular toxicity. * **Option C:** Lysosomal dysfunction triggers multiple pathways of programmed cell death. Conversely, it can also lead to **apoptosis defects** where the cell fails to clear damaged components, eventually leading to chronic inflammation and tissue damage [2]. **NEET-PG High-Yield Pearls:** * **Most Common LSD:** Gaucher Disease (Glucocerebrosidase deficiency) [4]. * **Inheritance:** Most are Autosomal Recessive, **except** Fabry disease and Hunter syndrome (X-linked Recessive). * **Zebra Bodies:** Characteristic electron microscopy finding in Fabry disease. * **Cherry Red Spot:** Seen in Tay-Sachs, Niemann-Pick, and Sandhoff disease [1]. * **Gaucher Cells:** "Wrinkled tissue paper" appearance of macrophages [5]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Genetic Disorders, p. 161. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Central Nervous System, pp. 1304-1305. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Genetic Disorders, pp. 163-164. [4] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Genetic Disorders, pp. 162-163. [5] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Genetic Disorders, p. 163.

Question 970: All of the following are seen in Thymoma except?

A. Hypogammaglobulinemia
B. Hyperalbuminemia (Correct Answer)
C. Red cell aplasia
D. Myasthenia gravis

Explanation: Hypogammaglobulinemia [5] is also known as Good’s Syndrome; this triad consists of thymoma, hypogammaglobulinemia, and low B-cell counts [3, 5], leading to increased susceptibility to infections. Analysis of Incorrect Options: Myasthenia Gravis (Option D): This is the most common association, seen in approximately 30–45% of thymoma patients. It is caused by autoantibodies against acetylcholine receptors (AChR) [1, 2] at the neuromuscular junction. Red Cell Aplasia (Option C): Pure Red Cell Aplasia (PRCA) is seen in about 5–10% of cases. Most common mediastinal tumor: Thymoma (specifically in the anterior mediastinum) [3]. Histology: Look for a mixture of neoplastic epithelial cells and non-neoplastic T-lymphocytes (thymocytes) [4]. Staging: The Masaoka Staging System is used to determine the prognosis based on capsular invasion [4]. **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. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Peripheral Nerves and Skeletal Muscles, pp. 1237-1238. [3] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Diseases Of The Urinary And Male Genital Tracts, pp. 571-572. [4] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of White Blood Cells, Lymph Nodes, Spleen, and Thymus, pp. 634-635. [5] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Diseases Of The Urinary And Male Genital Tracts, pp. 549-551.

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Cell Injury and Cell Death

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Adaptations of Cellular Growth

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Hemodynamic Disorders

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Genetic Disorders

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Nutritional Diseases

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Molecular Basis of Disease

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