General Pathology — MCQs

General Pathology Indian Medical PG Practice Questions and MCQs

Question 921: Which gene is involved in Rett syndrome?

A. P53
B. MECP2 (Correct Answer)
C. RB
D. BRCA

Explanation: **Explanation:** **Rett Syndrome** is a rare neurodevelopmental disorder that primarily affects females. The correct answer is **MECP2** (Methyl-CpG-binding protein 2), located on the **X chromosome (Xq28)**. 1. **Why MECP2 is correct:** The *MECP2* gene encodes a protein essential for normal brain development and function. It acts as a transcriptional repressor, binding to methylated DNA to "silence" specific genes. Mutations lead to the failure of gene silencing, causing global developmental regression, loss of purposeful hand movements (stereotypical hand-wringing), and ataxia. Since it is X-linked dominant, it is usually lethal in males, explaining why it is seen almost exclusively in females. 2. **Why other options are incorrect:** * **P53:** Known as the "Guardian of the Genome," this is a tumor suppressor gene. Mutations are associated with **Li-Fraumeni Syndrome** and various cancers, not neurodevelopmental disorders. * **RB (Retinoblastoma gene):** This is a cell cycle regulator (G1 to S phase). Mutations lead to **Retinoblastoma** and osteosarcoma. * **BRCA (BRCA1/2):** These genes are involved in DNA repair via homologous recombination. Mutations significantly increase the risk of **Breast and Ovarian cancers**. **High-Yield Clinical Pearls for NEET-PG:** * **Clinical Presentation:** A girl who develops normally until 6–18 months, followed by a sudden loss of speech and the pathognomonic **"hand-wringing" tremors**. * **Inheritance:** X-linked Dominant (most cases are *de novo* mutations). * **Pathology:** Brain biopsy typically shows decreased dendritic branching rather than neuronal degeneration.

Question 922: Which of the following statements is FALSE regarding Fibrinoid necrosis?

A. It is due to immune complex deposition.
B. It gives an eosinophilic appearance.
C. It is a Type II hypersensitivity reaction. (Correct Answer)
D. It is seen in malignant hypertension.

Explanation: ### Explanation **Fibrinoid necrosis** is a specialized form of cell death characterized by the deposition of immune complexes and plasma proteins (like fibrin) in the walls of blood vessels [1]. **Why Option C is the Correct Answer (The False Statement):** Fibrinoid necrosis is classically associated with **Type III Hypersensitivity reactions**. In these reactions, antigen-antibody complexes are deposited in the vessel walls, triggering complement activation and inflammation [1]. Type II hypersensitivity involves antibodies binding directly to cell surface antigens, which is not the primary mechanism behind fibrinoid necrosis. **Analysis of Other Options:** * **Option A (True):** It occurs when immune complexes (antigen-antibody) leak out of the vessel wall and combine with extravasated fibrin, creating a distinct histological appearance [1]. * **Option B (True):** On H&E staining, fibrinoid necrosis appears as a bright pink, "smudgy," **eosinophilic** area. This is due to the accumulation of proteinaceous material (fibrin and immunoglobulins). * **Option D (True):** In **malignant hypertension**, extreme blood pressure causes sudden damage to the endothelial lining, leading to the leakage of plasma proteins into the vessel wall, resulting in non-immune mediated fibrinoid necrosis [1]. **High-Yield Clinical Pearls for NEET-PG:** * **Common Sites/Conditions:** Polyarteritis Nodosa (PAN), Systemic Lupus Erythematosus (SLE), Rheumatic Heart Disease (Aschoff bodies), and Malignant Hypertension [1]. * **Histology Keyword:** Look for "bright pink, circumferential vessel wall destruction." * **Preeclampsia:** Fibrinoid necrosis is also seen in the placental vessels in preeclampsia. * **Mechanism:** It is essentially a combination of **vascular damage + protein leakage.** **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Cardiovascular Disease, pp. 277-279.

Question 923: Which type of RNA is primarily involved in gene silencing?

A. rRNA
B. tRNA
C. miRNA (Correct Answer)
D. None of the above

Explanation: **Explanation:** **MicroRNA (miRNA)** is a class of small, non-coding RNA molecules (approximately 22 nucleotides long) that play a critical role in the post-transcriptional regulation of gene expression [2]. They function primarily through **gene silencing** by binding to complementary sequences on target messenger RNA (mRNA) transcripts [1]. This binding leads to either mRNA degradation or the inhibition of translation, effectively "silencing" the gene's output [2]. This process is a key component of the RNA interference (RNAi) pathway. **Analysis of Options:** * **rRNA (Ribosomal RNA):** These are structural and functional components of ribosomes. They facilitate the translation of mRNA into proteins but do not possess gene-silencing capabilities. * **tRNA (Transfer RNA):** These act as "adapters" that carry specific amino acids to the ribosome during protein synthesis. Their role is purely translational, not regulatory. * **miRNA (Correct):** As described, these are the primary mediators of endogenous gene silencing [2]. **High-Yield Clinical Pearls for NEET-PG:** * **OncomiRs:** miRNAs that are dysregulated in cancer. They can act as **oncogenes** (by silencing tumor suppressor genes) or **tumor suppressors** (by silencing oncogenes) [1]. * **DICER Enzyme:** The ribonuclease III enzyme that processes pre-miRNA into mature, functional miRNA [2]. * **RISC (RNA-induced Silencing Complex):** The multi-protein complex that miRNA joins to execute the silencing of target mRNA [2]. * **siRNA vs. miRNA:** While both involve silencing, siRNA is typically exogenous (e.g., viral) and requires perfect base pairing, whereas miRNA is endogenous and can function with imperfect pairing [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. 230-231. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. With Illustrations By, pp. 16-18.

Question 924: The Human Leukocyte Antigen (HLA) complex in humans is located on which chromosome?

A. Chromosome 5
B. Chromosome 6 (Correct Answer)
C. Chromosome 7
D. Chromosome 8

Explanation: **Explanation:** The **Human Leukocyte Antigen (HLA)** complex, also known as the **Major Histocompatibility Complex (MHC)** in humans, is a cluster of genes located on the **short arm (p) of Chromosome 6** [2]. These genes encode surface glycoproteins that play a critical role in the immune system by presenting antigens to T-cells. * **Why Chromosome 6 is Correct:** The HLA region on Chromosome 6 (specifically 6p21.3) is the most gene-dense and polymorphic section of the human genome [2]. It contains three classes of genes: * **Class I (HLA-A, B, C):** Found on all nucleated cells; present antigens to CD8+ T-cells [2]. * **Class II (HLA-DP, DQ, DR):** Found on antigen-presenting cells; present antigens to CD4+ T-cells [3]. * **Class III:** Encode components of the complement system (C2, C4) and cytokines (TNF-̑). **Analysis of Incorrect Options:** * **Chromosome 5:** Associated with genes for several interleukins (IL-3, IL-4, IL-5) and the APC gene (Familial Adenomatous Polyposis), but not the HLA complex. * **Chromosome 7:** Contains genes for the T-cell receptor (TCR) gamma chain and the Cystic Fibrosis Transmembrane Conductance Regulator (CFTR). * **Chromosome 8:** Notable for the **c-myc** oncogene, which is involved in Burkitt Lymphoma (t(8;14)). **High-Yield Clinical Pearls for NEET-PG:** * **HLA-B27:** Strongly associated with Seronegative Spondyloarthropathies (e.g., Ankylosing Spondylitis) [1]. * **HLA-DR3/DR4:** Associated with Type 1 Diabetes Mellitus [4]. * **HLA-DQ2/DQ8:** Associated with Celiac Disease. * **Inheritance:** HLA genes are inherited as a **haplotype** (one set from each parent) in a codominant fashion. **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. 49-50. [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. 156-157. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of the Immune System, pp. 202-203. [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. 177-178.

Question 925: What is the most common primary source of brain metastasis?

A. Breast carcinoma
B. Lung carcinoma (Correct Answer)
C. Gastric carcinoma
D. Colo-rectal carcinoma

Explanation: **Explanation:** **1. Why Lung Carcinoma is Correct:** Lung carcinoma is the most common primary source of brain metastasis [1], accounting for approximately **40–50%** of all metastatic brain tumors. The primary reason is the direct access to the systemic circulation. Cancer cells from the lungs enter the pulmonary veins, reach the left side of the heart, and are distributed via the carotid and vertebral arteries directly into the cerebral circulation. Both Small Cell Lung Carcinoma (SCLC) and Adenocarcinoma are highly prone to early hematogenous spread to the brain [2]. **2. Analysis of Incorrect Options:** * **Breast Carcinoma:** This is the **second most common** source of brain metastasis [1]. While it frequently spreads to the brain (especially HER2-positive and Triple-Negative subtypes), it occurs less frequently than lung cancer. * **Gastric Carcinoma:** Metastasis to the brain from the GI tract is relatively rare [1]. Gastric cancers more commonly metastasize to the liver (via portal circulation) or the peritoneum (Krukenberg tumor). * **Colo-rectal Carcinoma:** While it can spread to the brain, it is far less common than lung or breast sources. It typically metastasizes to the liver first due to portal venous drainage. **3. NEET-PG High-Yield Pearls:** * **Most common source (Overall):** Lung > Breast > Melanoma > Renal Cell Carcinoma > GI tract [1]. * **Most common source in Children:** Neuroblastoma, followed by Wilms tumor and Leukemias. * **Melanoma:** Has the **highest propensity** (highest percentage of cases) to spread to the brain [1], although lung cancer is more common in absolute numbers. * **Location:** Metastases are usually multiple and typically occur at the **grey-white matter junction** due to the narrowing of blood vessels at this interface. * **Primary Brain Tumor:** The most common primary malignant brain tumor in adults is **Glioblastoma Multiforme (GBM)**, but overall, metastatic tumors are more common than primary brain tumors [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Central Nervous System, pp. 1317-1318. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Lung, pp. 724-725.

Question 926: What is the confirmatory test for the diagnosis of Amyloidosis?

A. Diagnostic peritoneal lavage
B. Tongue biopsy
C. Rectal biopsy (Correct Answer)
D. Whole body CT scan

Explanation: **Explanation:** **Amyloidosis** is a disorder characterized by the extracellular deposition of misfolded proteins in various tissues [1]. For a definitive diagnosis, tissue biopsy followed by histopathological examination is mandatory [2]. **Why Rectal Biopsy is Correct:** Historically and clinically, **rectal biopsy** has been considered a standard confirmatory test for systemic amyloidosis. The rectum has a rich submucosal vascular network where amyloid fibrils tend to deposit. It has a high diagnostic yield (approximately 75–80%) and is relatively easy to perform. However, in modern practice, **Abdominal Fat Pad Aspiration** is often the initial screening test of choice due to its non-invasive nature, though rectal biopsy remains a classic "confirmatory" gold standard in many textbooks and exams. **Analysis of Incorrect Options:** * **A. Diagnostic Peritoneal Lavage (DPL):** This is used to detect intra-abdominal hemorrhage (usually post-trauma) and has no role in identifying protein deposition. * **B. Tongue Biopsy:** While macroglossia is a classic sign of AL amyloidosis, tongue biopsy is painful and carries a risk of significant bleeding; it is not the preferred site. * **D. Whole body CT scan:** CT scans can show organomegaly (like hepatosplenomegaly), but they cannot identify microscopic amyloid fibrils. **High-Yield Clinical Pearls for NEET-PG:** * **Gold Standard Stain:** **Congo Red stain**, which shows **Apple-green birefringence** under polarized light [2]. * **Most sensitive site:** Abdominal fat pad aspiration (80% sensitivity). * **Most common site of involvement:** Kidney (presents as Nephrotic Syndrome). * **Electron Microscopy:** Shows non-branching fibrils (7.5 to 10 nm diameter) [2]. * **Secondary Amyloidosis (AA):** Associated with chronic inflammation (e.g., TB, Rheumatoid Arthritis) [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of the Immune System, pp. 264-266. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of the Immune System, pp. 268-269.

Question 927: Which CD marker is characteristic of angiosarcoma?

A. CD 10
B. CD 19
C. CD 25
D. CD 31 (Correct Answer)

Explanation: **Explanation:** **1. Why CD 31 is the Correct Answer:** Angiosarcoma is a malignant neoplasm of **vascular endothelial cells**. To confirm the diagnosis histologically, pathologists look for markers specific to the endothelium [1]. **CD 31 (Platelet Endothelial Cell Adhesion Molecule-1 or PECAM-1)** is considered the most sensitive and specific marker for endothelial differentiation [1]. It is expressed on the surface of platelets, monocytes, neutrophils, and, most importantly, at the intercellular junctions of endothelial cells. Other vascular markers often used in conjunction include **CD 34** and **Von Willebrand Factor (Factor VIII-related antigen)** [1]. **2. Analysis of Incorrect Options:** * **CD 10 (CALLA):** This is a marker for Pre-B cell Acute Lymphoblastic Leukemia (ALL) and is also expressed in follicular lymphomas and certain carcinomas (like Renal Cell Carcinoma). * **CD 19:** This is a pan-B cell marker. It is expressed throughout B-cell development (from pro-B cells until just before terminal differentiation into plasma cells) and is used to identify B-cell lymphomas. * **CD 25:** This is the alpha chain of the IL-2 receptor. It is a marker for T-cell activation and is classically associated with **Hairy Cell Leukemia** and Adult T-cell Leukemia/Lymphoma (ATLL). **3. High-Yield Clinical Pearls for NEET-PG:** * **Risk Factors for Angiosarcoma:** Chronic lymphedema (Stewart-Treves Syndrome following mastectomy), prior radiation therapy, and exposure to toxins like **Vinyl Chloride**, Arsenic, or Thorotrast (specifically for hepatic angiosarcoma). * **ERG (ETS-related gene):** A newer, highly specific nuclear marker for vascular tumors (including angiosarcoma) that is frequently tested in recent exams. * **Morphology:** Look for "anastomosing vascular channels" lined by atypical, pleomorphic endothelial cells [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of Infancy and Childhood, pp. 527-528.

Question 928: Irreversible cell injury is primarily caused by which of the following?

A. Membrane damage (Correct Answer)
B. Bleb formation
C. Loss of microvilli
D. Detachment of ribosomes

Explanation: **Explanation:** The hallmark of **irreversible cell injury** is the transition from cellular dysfunction to cell death. The critical "point of no return" is defined by two main phenomena: the inability to reverse mitochondrial dysfunction and, most importantly, **severe damage to plasma and lysosomal membranes.** [1] **1. Why Membrane Damage is Correct:** Extensive membrane damage allows the leakage of intracellular enzymes and proteins into the extracellular space and the influx of calcium into the cell. [1] Specifically: * **Plasma membrane damage** leads to loss of osmotic balance and cellular contents. [1] * **Lysosomal membrane damage** results in the leakage of acid hydrolases into the cytoplasm, which enzymatically digest the cell (autolysis). [1] * **Mitochondrial membrane damage** leads to the permanent loss of ATP production and the release of pro-apoptotic proteins. [1], [2] **2. Why Other Options are Incorrect:** * **B. Bleb formation:** This is a characteristic feature of **reversible** injury. [4] It occurs due to cytoskeleton reorganization and is not necessarily fatal to the cell. * **C. Loss of microvilli:** This is an early, **reversible** change caused by cellular swelling and ATP depletion, leading to the distortion of the cell surface. [3], [4] * **D. Detachment of ribosomes:** This occurs due to the swelling of the Rough Endoplasmic Reticulum (RER) in **reversible** injury, leading to a decrease in protein synthesis. If the stress is removed, ribosomes can reattach. **NEET-PG High-Yield Pearls:** * **First sign of cell injury:** Cellular swelling (Hydropic change). * **Most common cause of cell injury:** Hypoxia (Ischemia being the most common cause of hypoxia). * **Morphological hallmarks of Irreversibility:** Amorphous densities in the mitochondrial matrix and nuclear changes (Pyknosis, Karyorrhexis, Karyolysis). [5] * **Serum markers:** Membrane damage is the reason we can detect enzymes like Troponin (in MI) or ALT/AST (in hepatitis) in the blood. [1] **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. 60-61. [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. 102-103. [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. 53-55. [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. [5] 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. 53.

Question 929: Ormond's disease is characterized by which of the following conditions?

A. Retractile testis
B. Idiopathic retroperitoneal fibrosis (Correct Answer)
C. Idiopathic retroperitoneal lymphadenopathy
D. Idiopathic mediastinitis

Explanation: **Explanation:** **Ormond’s disease** is the eponym for **idiopathic retroperitoneal fibrosis (RPF)**. It is a rare condition characterized by the development of extensive inflammatory fibroblastic proliferation in the retroperitoneum, which typically encases the abdominal aorta, inferior vena cava, and ureters [1]. 1. **Why Option B is correct:** In approximately 70% of cases, RPF is idiopathic (Ormond’s disease). It is now considered part of the spectrum of **IgG4-related diseases**, characterized by a dense infiltrate of IgG4-positive plasma cells and storiform fibrosis. Clinically, it often presents with obstructive uropathy as the fibrous tissue "pulls" the ureters medially [1]. 2. **Why other options are incorrect:** * **Option A:** Retractile testis is a physiological variant where a strong cremasteric reflex pulls the testis into the inguinal canal; it has no association with retroperitoneal fibrosis [2]. * **Option C:** While lymphadenopathy can occur in the retroperitoneum due to lymphoma or metastasis, Ormond’s disease specifically refers to the fibrous plaque formation, not primary lymph node enlargement. * **Option D:** Idiopathic mediastinitis (specifically fibrosing mediastinitis) is a related condition also linked to IgG4-related disease, but the term "Ormond’s disease" is strictly reserved for the retroperitoneal manifestation. **NEET-PG High-Yield Pearls:** * **Radiological Sign:** On intravenous pyelogram (IVP), look for **medial deviation of the ureters** (Maiden-Lash sign). * **Secondary Causes:** RPF can be induced by drugs, most notably **Methysergide** (an ergot alkaloid), as well as beta-blockers and hydralazine. * **Treatment:** Corticosteroids are the first-line medical management to reduce inflammation. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Kidney, pp. 963-964. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Diseases Of The Urinary And Male Genital Tracts, pp. 508-509.

Question 930: When a chromosome breaks from one chromosome and joins another chromosome, what is it called?

A. Translocation (Correct Answer)
B. Isochromosome
C. Ring chromosome
D. Inversion

Explanation: ### Explanation **Correct Answer: A. Translocation** Translocation is a chromosomal abnormality where a segment of one chromosome breaks off and attaches to a **non-homologous chromosome** [1]. This can be **reciprocal** (exchange of fragments between two chromosomes) or **Robertsonian** (fusion of two long arms of acrocentric chromosomes) [5]. Because the question describes genetic material moving from one chromosome to another, translocation is the correct term. **Why other options are incorrect:** * **B. Isochromosome:** This occurs due to the **horizontal** (rather than vertical) division of the centromere during meiosis or mitosis. This results in a chromosome with two identical arms (either two short arms or two long arms), leading to monosomy for one arm and trisomy for the other. * **C. Ring chromosome:** This happens when a chromosome loses both its telomeric ends (breaks at both ends) and the remaining "sticky" ends fuse together to form a circle. * **D. Inversion:** This involves a single chromosome where a segment breaks, flips **180 degrees**, and reattaches. It does not involve a second chromosome. It is classified as *paracentric* (excluding centromere) or *pericentric* (including centromere). **High-Yield Clinical Pearls for NEET-PG:** * **t(8;14):** Burkitt Lymphoma (c-myc activation) [2]. * **t(9;22):** Philadelphia Chromosome (CML; BCR-ABL fusion) [3]. * **t(14;18):** Follicular Lymphoma (BCL-2 activation). * **t(15;17):** Acute Promyelocytic Leukemia (PML-RARα; responds to ATRA) [4]. * **Most common Isochromosome:** i(Xq) seen in some cases of Turner Syndrome. **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. 58-59. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, pp. 324-325. [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. 225-226. [4] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, p. 326. [5] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Genetic Disorders, pp. 170-171.

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