General Pathology — MCQs

General Pathology Indian Medical PG Practice Questions and MCQs

Question 1271: Hemochromatosis affects which of the following organs?

A. Heart
B. Pancreas
C. Skin
D. All of the above (Correct Answer)

Explanation: **Explanation:** **Hemochromatosis** is a disorder of iron metabolism characterized by excessive iron accumulation in various parenchymal organs, leading to tissue damage and functional impairment [2]. The primary defect involves the **HFE gene mutation**, resulting in decreased **hepcidin** levels and uncontrolled intestinal iron absorption [3]. **Why "All of the above" is correct:** Iron (in the form of hemosiderin) deposits in multiple organ systems, leading to a classic clinical triad: 1. **Pancreas:** Iron deposition in islet cells causes cell death and fibrosis, leading to secondary diabetes mellitus (often called **"Bronze Diabetes"**) [1]. 2. **Skin:** Increased melanin production and direct iron deposition result in characteristic **slate-gray or metallic hyperpigmentation**. 3. **Heart:** Deposition in the myocardium leads to **restrictive or dilated cardiomyopathy** and arrhythmias. **Other affected organs:** * **Liver:** The first organ affected; leads to micronodular cirrhosis and significantly increases the risk of **Hepatocellular Carcinoma (HCC)** [2], [3]. * **Gonads:** Pituitary deposition leads to hypogonadotropic hypogonadism (loss of libido, impotence). * **Joints:** Calcium pyrophosphate deposition (pseudogout). **NEET-PG High-Yield Pearls:** * **Stain:** **Prussian Blue** (Perl’s stain) is used to visualize iron deposits (blue color) [2]. * **Classic Triad:** Cirrhosis, Diabetes Mellitus, and Skin Pigmentation. * **Most common cause of death:** Cardiac failure (in early-onset) or Hepatocellular Carcinoma (in long-standing cases). * **Treatment of choice:** Therapeutic phlebotomy [3]. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Liver And Biliary System Disease, pp. 435-436. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Liver and Gallbladder, pp. 854-855. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Liver and Gallbladder, p. 854.

Question 1272: CA 125 is used for what purpose?

A. Follow-up of ovarian cancer (Correct Answer)
B. Diagnosis of pancreatic cancer
C. Diagnosis of stomach cancer
D. Diagnosis of ovarian cancer

Explanation: **CA 125 (Cancer Antigen 125)** is a high-molecular-weight glycoprotein primarily used as a tumor marker for **non-mucinous epithelial ovarian tumors**. [1] 1. **Why Option A is Correct:** The primary clinical utility of CA 125 lies in **monitoring the response to therapy** and **detecting the recurrence** (follow-up) of ovarian cancer. [1] A significant drop in levels post-surgery or chemotherapy indicates a good response, while a subsequent rise often precedes clinical or radiological evidence of recurrence by months. 2. **Why Other Options are Incorrect:** * **Option D (Diagnosis of Ovarian Cancer):** CA 125 is **not** used for primary diagnosis or screening in the general population because it lacks specificity. [1] It can be elevated in various non-malignant conditions such as endometriosis, pelvic inflammatory disease (PID), pregnancy, and menstruation. * **Options B & C (Pancreatic and Stomach Cancer):** While CA 125 can be elevated in various intra-abdominal malignancies due to peritoneal irritation, it is not the marker of choice. **CA 19-9** is the specific marker for pancreatic cancer, and **CEA** is more commonly associated with gastric malignancies. [1] **High-Yield Clinical Pearls for NEET-PG:** * **Most sensitive marker for Ovarian Cancer:** CA 125 (specifically for Serous Cystadenocarcinoma). * **Marker for Mucinous Ovarian Tumors:** CEA (CA 125 is often normal). * **Marker for Yolk Sac Tumor:** Alpha-fetoprotein (AFP). * **Marker for Dysgerminoma:** LDH. * **Marker for Granulosa Cell Tumor:** Inhibin. * **Meigs Syndrome:** Characterized by the triad of ovarian fibroma, ascites, and pleural effusion; it can cause a "false positive" elevation of CA 125. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, pp. 344-346.

Question 1273: Metastatic calcification is commonly seen in all of the following, except:

A. Lungs
B. Kidneys
C. Gastric mucosa
D. Cardiac valves (Correct Answer)

Explanation: **Explanation:** The core concept distinguishing **Metastatic Calcification** from Dystrophic Calcification is the state of the underlying tissue and serum calcium levels. Metastatic calcification occurs in **normal tissues** due to **hypercalcemia** (e.g., hyperparathyroidism, vitamin D toxicity, or bone destruction) [1], [2]. **Why Cardiac Valves is the Correct Answer:** Calcification of cardiac valves (such as Calcific Aortic Stenosis or Mitral Annular Calcification) is a classic example of **Dystrophic Calcification**. This occurs in **damaged or necrotic tissues** (aging, wear-and-tear, or chronic inflammation) while serum calcium levels remain **normal**. Therefore, it is the "except" in this list. **Why the other options are incorrect (Sites of Metastatic Calcification):** Metastatic calcification preferentially affects tissues that lose acid, creating an **internal alkaline environment** which favors calcium deposition [1]. * **Lungs (Option A):** Loss of $CO_2$ via respiration creates relative alkalinity [1]. * **Kidneys (Option B):** Excretion of acid ($H^+$) into urine leaves the renal parenchyma alkaline (often leading to nephrocalcinosis) [1], [3]. * **Gastric Mucosa (Option C):** Secretion of $HCl$ into the stomach lumen creates an alkaline state in the mucosal cells [1]. * **Systemic Arteries:** Also a common site due to the alkaline nature of oxygenated blood [1]. **NEET-PG High-Yield Pearls:** 1. **Dystrophic Calcification:** Normal serum $Ca^{2+}$, damaged tissue (e.g., Psammoma bodies, Atherosclerotic plaques, healed TB lymph nodes). 2. **Metastatic Calcification:** High serum $Ca^{2+}$, normal tissue (e.g., "Milk-alkali syndrome," Sarcoidosis) [2]. 3. **Morphology:** On H&E stain, both appear as basophilic (blue-purple), amorphous granular clumps [1]. 4. **Von Kossa Stain:** Used specifically to identify calcium deposits (appears black). **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] 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. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Endocrine System, pp. 1105-1106.

Question 1274: Coagulative necrosis is typically seen in which organ?

A. Brain
B. Breast
C. Liver (Correct Answer)
D. All of the above

Explanation: **Explanation:** **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. This occurs because the injury denatures not only structural proteins but also enzymatic proteins, thereby blocking the proteolysis (self-digestion) of the dead cells. 1. **Why Liver is Correct:** Coagulative necrosis is the characteristic feature of **hypoxic/ischemic death (infarction)** in all solid visceral organs except the brain [1]. This includes the **liver, heart (Myocardial Infarction), and kidney**. In these organs, the acidic environment and protein denaturation result in firm, opaque tissue [1]. 2. **Why Other Options are Incorrect:** * **Brain:** Ischemic injury to the central nervous system typically results in **Liquefactive Necrosis**. Due to the high lipid content and lack of a supporting stroma, the tissue is completely digested into a liquid viscous mass (pus/fluid) [1]. * **Breast:** Necrosis in the breast is most commonly **Fat Necrosis**, usually resulting from trauma or surgery. This involves the action of lipases on fatty tissue, leading to the formation of "calcium soaps" (saponification). **High-Yield Clinical Pearls for NEET-PG:** * **Mechanism:** Denaturation of structural and enzymatic proteins (acidophilia/eosinophilia on H&E stain). * **Microscopic Hallmark:** "Ghost cells" (cells with preserved outlines but loss of nuclei/organelles). * **Exception Rule:** Ischemia = Coagulative Necrosis (EXCEPT in the Brain) [1]. * **Wet Gangrene:** A combination of coagulative necrosis (from ischemia) and liquefactive necrosis (from superimposed bacterial infection) [1]. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. (Basic Pathology) introduces the student to key general principles of pathology, both as a medical science and as a clinical activity with a vital role in patient care. Part 2 (Disease Mechanisms) provides fundamental knowledge about the cellular and molecular processes involved in diseases, providing the rationale for their treatment. Part 3 (Systematic Pathology) deals in detail with specific diseases, with emphasis on the clinically important aspects., pp. 148-149.

Question 1275: Which of the following is NOT one of the four key cell cycle regulators that are dysregulated in a variety of human cancers?

A. P16/INK4a
B. Cyclin D
C. P21 (Correct Answer)
D. RB

Explanation: The regulation of the **G1/S checkpoint** is a critical step in the cell cycle [3], and its dysregulation is a hallmark of almost all human cancers [4]. This checkpoint is governed by the **RB pathway**. ### **Why P21 is the Correct Answer** While **P21** is a potent Cyclin-Dependent Kinase Inhibitor (CKI) induced by p53 [1], it is **not** considered one of the "four key regulators" that are specifically and frequently mutated or dysregulated as a primary mechanism in the G1/S transition across the majority of cancers. Instead, the "four key regulators" refer to the core components of the RB-governed molecular switch [4]. ### **Explanation of Incorrect Options (The Four Key Regulators)** The G1/S checkpoint is controlled by four specific proteins that function in a single pathway [4]. If one is mutated, the others usually remain normal (as the pathway is already broken): * **RB (Option D):** The "Governor" of the cell cycle [4]. It binds E2F, preventing progression to the S-phase [4]. Loss of RB function leads to uncontrolled division [3]. * **Cyclin D (Option B):** Overexpression of Cyclin D (e.g., in Mantle Cell Lymphoma) leads to persistent phosphorylation (inactivation) of RB [3]. * **CDK4:** (Though not listed as an option, this is the third regulator). It complexes with Cyclin D to phosphorylate RB [1]. * **P16/INK4a (Option A):** A specific inhibitor of CDK4 [5]. Loss of P16 (via deletion or methylation) is a very common event in many cancers (e.g., melanoma, pancreatic cancer), leading to hyperactive CDK4 [2]. ### **NEET-PG High-Yield Pearls** * **The "Four Key Regulators":** P16, Cyclin D1, CDK4, and RB [4]. * **P53 vs. RB:** p53 is the "Guardian of the Genome" (senses DNA damage), while RB is the "Governor of the Cell Cycle" (controls the G1/S switch) [4]. * **P21 Function:** It is a downstream mediator of p53. When DNA is damaged, p53 increases P21, which inhibits CDKs, causing cell cycle arrest [1]. * **HPV Connection:** The E7 protein of HPV binds and inactivates RB [4], while E6 inactivates p53. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, pp. 302-303. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, pp. 297-298. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, pp. 300-301. [4] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, pp. 301-302. [5] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. With Illustrations By, pp. 37-38.

Question 1276: Ectopic rest of normal tissue is known as?

A. Choristoma (Correct Answer)
B. Hamartoma
C. Pseudotumor
D. Lymphoma

Explanation: **Explanation:** The correct answer is **A. Choristoma**. A **Choristoma** is defined as a mass of histologically normal tissue present in an abnormal anatomical location (ectopic rest) [1]. It is a developmental anomaly rather than a true neoplasm [1]. A classic clinical example is a nodule of normal pancreatic tissue found in the submucosa of the stomach or small intestine. **Analysis of Incorrect Options:** * **B. Hamartoma:** This is a focal overgrowth of cells and tissues native to the organ in which it occurs (e.g., a pulmonary hamartoma containing cartilage, bronchial epithelium, and fat). Unlike a choristoma, the tissue is in its **correct** location but is disorganized. * **C. Pseudotumor:** This is a general clinical term for a non-neoplastic mass that mimics a tumor (e.g., inflammatory myofibroblastic tumor or an abscess). It does not specifically refer to ectopic tissue. * **D. Lymphoma:** This is a malignant neoplasm of lymphoid tissue. It is a true malignancy, not a developmental rest. **High-Yield Pearls for NEET-PG:** * **Choristoma = Ectopic/Heterotopic tissue** (Normal tissue, Wrong place) [1]. * **Hamartoma = Disorganized tissue** (Normal tissue, Right place). * Both Choristomas and Hamartomas end in the suffix "-oma" but are **benign developmental malformations**, not true neoplasms [1]. * Common Choristoma: **Meckel’s Diverticulum** containing gastric mucosa [1]. * Common Hamartoma: **Bile duct hamartoma** (Von Meyenburg complex) or **Hypothalamic hamartoma**. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, pp. 757-759.

Question 1277: Patau syndrome is caused by which chromosomal abnormality?

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

Explanation: **Explanation:** **Patau syndrome** is a severe genetic disorder caused by **Trisomy 13** (the presence of an extra copy of chromosome 13) [1]. It is the least common and most severe of the three viable autosomal trisomies. The underlying mechanism is usually **meiotic non-disjunction**, most frequently associated with advanced maternal age. **Analysis of Options:** * **Trisomy 13 (Correct):** Characterized by a classic triad of **Microphthalmia, Cleft lip/palate, and Polydactyly** [1]. It also involves severe CNS malformations like holoprosencephaly and scalp defects (aplasia cutis congenita). * **Trisomy 21 (Option A):** This is **Down Syndrome**, the most common autosomal trisomy [1]. Key features include Brushfield spots, Simian crease, and early-onset Alzheimer’s. * **Trisomy 18 (Option B):** This is **Edwards Syndrome** [1]. It is characterized by "rocker-bottom feet," clenched fists with overlapping fingers, and micrognathia. * **18p deletion (Option C):** This refers to Monosomy 18p, a rare chromosomal deletion syndrome distinct from the numerical trisomies. **High-Yield Clinical Pearls for NEET-PG:** * **Mnemonic for Trisomies:** **P**atau (Trisomy **13** - **P**uberty age), **E**dwards (Trisomy **18** - **E**lection age), **D**own (Trisomy **21** - **D**rinking age). * **Patau Key Features:** Holoprosencephaly (failure of forebrain to divide), Polydactyly, and "punched-out" scalp lesions (**Aplasia cutis**). * **Screening:** On maternal serum screening, Patau syndrome typically shows **decreased** levels of free β-hCG and PAPP-A in the first trimester. * **Prognosis:** Extremely poor; most infants do not survive beyond the first year of life. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Genetic Disorders, pp. 171-172.

Question 1278: Sloughing of necrotic epithelium is characteristic of:

A. Aspirin burn (Correct Answer)
B. Denture sore mouth
C. Traumatic ulcer
D. Contact dermatitis

Explanation: **Explanation:** The correct answer is **Aspirin burn**. **Mechanism of Action:** Aspirin (acetylsalicylic acid) is a common cause of chemical burns in the oral cavity, typically occurring when a patient places a tablet directly against a painful tooth or gingiva instead of swallowing it [1]. The acidic nature of the drug causes **coagulative necrosis** of the epithelium. Clinically, this manifests as a painful, white, friable plaque. The necrotic tissue loses its attachment to the underlying connective tissue, leading to the characteristic **sloughing** or peeling of the epithelium, leaving behind a raw, erythematous, and bleeding base. **Analysis of Incorrect Options:** * **Denture sore mouth (Chronic Atrophic Candidiasis):** This is characterized by diffuse inflammation and erythema under a denture. It does not typically involve the sloughing of necrotic epithelium; rather, it is a reactive mucosal change. * **Traumatic ulcer:** These are usually localized areas of tissue loss (ulceration) caused by mechanical injury (e.g., biting). While the center is denuded, the primary feature is a deep crater rather than widespread necrotic sloughing. * **Contact dermatitis (Stomatitis venenata):** This is a Type IV hypersensitivity reaction. It presents with edema, redness, and itching/burning. While severe cases may blister, the classic "sloughing of necrotic epithelium" is the hallmark of a chemical burn like aspirin [2]. **NEET-PG High-Yield Pearls:** * **Chemical Burns:** Other agents causing similar sloughing include silver nitrate, phenol, and hydrogen peroxide [2]. * **Clinical Appearance:** The white patch in an aspirin burn can be wiped off (unlike leukoplakia), revealing a painful, red surface [3]. * **Histopathology:** Shows coagulative necrosis where cellular outlines are preserved for a short duration but nuclei are lost. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Infectious Diseases, pp. 430-431. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, pp. 761-762. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Lung, pp. 736-737.

Question 1279: Coagulative necrosis is seen in which of the following conditions?

A. Tuberculosis
B. Sarcoidosis
C. Gangrene (Correct Answer)
D. Cryptococcal infection

Explanation: **Explanation:** **Coagulative necrosis** is the most common pattern of necrosis, characterized by the preservation of the basic structural outline of the cell and tissue for several days. This occurs because the injury denatures not only structural proteins but also enzymatic proteins, thereby blocking the proteolysis (autolysis) of the dead cells. * **Why Gangrene is Correct:** Gangrene (specifically **Dry Gangrene**) is essentially a form of coagulative necrosis that occurs in a limb (usually the lower leg) following the loss of blood supply (ischemia) [1]. If a bacterial infection is superimposed, it evolves into "Wet Gangrene," which involves liquefactive necrosis [1]. However, in the context of this question, gangrene is the classic clinical manifestation of coagulative necrosis. **Analysis of Incorrect Options:** * **A. Tuberculosis:** Characterized by **Caseous necrosis** [2], a distinct form of coagulative necrosis where the tissue architecture is completely lost, appearing "cheese-like" and granular. * **B. Sarcoidosis:** Characterized by **Non-caseating granulomas**. Necrosis is typically absent in sarcoidosis; its presence usually points toward an infectious etiology like TB. * **C. Cryptococcal infection:** Fungal infections, particularly Cryptococcus, typically lead to **Liquefactive necrosis** (especially in the brain) or granulomatous inflammation. **High-Yield Clinical Pearls for NEET-PG:** * **Exception Rule:** Ischemia in all solid organs (Heart, Kidney, Spleen) leads to coagulative necrosis **EXCEPT in the Brain**, where ischemia leads to **liquefactive necrosis** [3]. * **Mechanism:** The hallmark of coagulative necrosis is the denaturation of proteins (including lysosomal enzymes). * **Microscopic Appearance:** Cells appear as "tombstones"—they retain their shape but lose their nuclei (karyolysis) and show increased cytoplasmic eosinophilia [4]. **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. 103-104. [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. 55. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Hemodynamic Disorders, Thromboembolic Disease, and Shock, p. 140. [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. 147-148.

Question 1280: The most likely inheritance pattern depicted in the following pedigree is:

A. Autosomal dominant
B. X-linked recessive
C. X-linked dominant (Correct Answer)
D. Autosomal recessive

Explanation: ### Explanation **1. Why X-linked Dominant (XLD) is Correct:** The hallmark of X-linked dominant inheritance is the **transmission pattern from an affected father.** Since a father gives his Y chromosome to his sons and his only X chromosome to his daughters: * **All daughters** of an affected father will be affected (they must inherit the dominant allele). [1] * **No sons** of an affected father will be affected (they inherit the Y chromosome). Additionally, affected females can pass the trait to both sons and daughters with a 50% probability. The pedigree shows vertical transmission (no skipped generations), which is characteristic of dominant traits. [1] **2. Why Other Options are Incorrect:** * **Autosomal Dominant (AD):** While AD also shows vertical transmission, it would allow for male-to-male transmission. If a father passes the trait to his son, X-linked inheritance is ruled out. [2] * **X-linked Recessive (XLR):** In XLR, affected fathers typically have unaffected daughters (who become carriers), and the trait often "skips" generations, predominantly affecting males. * **Autosomal Recessive (AR):** AR traits usually appear in a single generation (horizontal pattern) among siblings and often involve consanguinity. It requires both parents to be carriers. [1] **3. NEET-PG High-Yield Pearls:** * **Key Differentiator:** If you see an affected father with **all** daughters affected and **zero** sons affected, think **X-linked Dominant**. * **Classic Examples:** Vitamin D-resistant rickets (Hypophosphatemic rickets), Alport Syndrome (can also be AR/AD), and Rett Syndrome. * **Fragile X Syndrome:** Follows XLD inheritance but with variable expressivity due to triplet repeat expansion. * **Lethality:** Some XLD conditions (e.g., Incontinentia Pigmenti) are lethal in males, leading to pedigrees showing only affected females and multiple spontaneous abortions (miscarriages of male fetuses). **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. 53-54. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Genetic Disorders, pp. 149-150.

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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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Environmental Pathology

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Nutritional Diseases

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Molecular Basis of Disease

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