General Pathology — MCQs

General Pathology Indian Medical PG Practice Questions and MCQs

Question 1471: Amyloidosis is associated with all of the following conditions except:

A. Multiple myeloma
B. Renal failure
C. Chronic inflammatory conditions
D. Acute inflammatory conditions (Correct Answer)

Explanation: ***Acute inflammatory conditions*** - Amyloidosis is primarily associated with chronic inflammatory conditions rather than acute ones, making this option less likely [1]. - Conditions like **chronic infections** and malignancies are more commonly linked to amyloid deposition than acute inflammation [1]. *Multiple myeloma* - A significant association exists between **multiple myeloma** and amyloidosis, as the production of light chains can lead to **AL amyloidosis** [3]. - Patients with myeloma often develop **renal complications** due to amyloid infiltration. *Renal failure* - **Renal failure** is frequently seen in patients with amyloidosis due to renal amyloid deposits, leading to glomerular damage. - The kidneys are one of the primary organs affected in systemic amyloidosis, resulting in significant clinical manifestations. *Alzheimer's disease* - Alzheimer's disease is associated with **amyloid-beta peptide** accumulation, classifying it as AD-related amyloidosis [2]. - This form of amyloidosis is well documented in the literature, making it more relevant compared to acute inflammatory conditions. **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. 136-140. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of the Immune System, pp. 269-270. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of the Immune System, pp. 266-267.

Question 1472: Which of the following amyloid forms is seen in secondary amyloidosis associated with chronic diseases?

A. Amyloid light chain
B. ATTR
C. Amyloid beta (Aβ)
D. AA amyloid (Correct Answer)

Explanation: ***Amyloid Associated Protein*** - This form is particularly linked with **secondary amyloidosis**, commonly seen in conditions like chronic infections or inflammatory diseases [1]. - It is derived from **serum amyloid A (SAA)** protein, which elevates in response to inflammation, leading to the accumulation of amyloid fibrils [1][2]. *ATTR* - Stands for **transthyretin amyloidosis**, associated with genetic mutations or aging, not typically related to chronic secondary causes. - Involves proteins that primarily affect the **heart** and **nervous system**, particularly distinct from secondary amyloid deposits. *Amyloid light chain* - Primarily associated with **primary amyloidosis (AL)**, resulting from monoclonal plasma cell disorders, differing from the context of chronic diseases. - Characterized by deposition of **light chains from immunoglobulins**, rather than the **serum amyloid A** found in secondary amyloidosis [1]. *Beta 2 Amyloid* - Refers to **beta-amyloid** peptide associated with **Alzheimer's disease**, unrelated to secondary amyloidosis or chronic inflammatory states. - It is associated more with **neurological** pathologies, specifically the formation of plaques, rather than systemic amyloid deposition. **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. 136-140. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of the Immune System, pp. 267-268.

Question 1473: White infarcts are seen in all the following organs except:

A. Lung (Correct Answer)
B. Kidney
C. Heart
D. Spleen

Explanation: ***Lung*** - The lung typically exhibits **red infarcts** due to its dual blood supply from the pulmonary and bronchial arteries, which can cause hemorrhagic infarction [1]. - **White infarcts** are usually associated with organs that have a single blood supply, making the lung an exception in this context. *Kidney* - The kidney is prone to **white infarcts** due to its single blood supply via the renal artery, leading to coagulative necrosis upon occlusion [1]. - This characteristic is common in many solid organs with similar vascular anatomy. *Spleen* - The spleen also shows a tendency for **white infarcts**, especially in cases of **splenic artery occlusion** [1]. - Like the kidney, it has a singular arterial supply, which is a key factor in the formation of white infarcts. *Heart* - Myocardial infarction in the heart typically presents as **white infarcts**, particularly in areas where blood flow is compromised [1]. - The heart's blood supply functions primarily through the coronary arteries, justifying the occurrence of white infarcts during occlusion. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Hemodynamic Disorders, Thromboembolic Disease, and Shock, p. 140.

Question 1474: Sun damage causes malignant transformation of the skin by:

A. Direct DNA damage
B. Free radical formation
C. Induction of pyrimidine dimers (Correct Answer)
D. Mutation of p53 due to UV exposure

Explanation: ***Induction of pyrimidine dimers*** - **Ultraviolet (UV) radiation** from the sun causes the formation of **covalent bonds between adjacent pyrimidine bases** (thymine or cytosine) on the same DNA strand, creating pyrimidine dimers [1]. - These dimers lead to **DNA distortion**, interfering with DNA replication and transcription, and if not repaired, can result in **mutations** that contribute to carcinogenesis [2]. *Free radical formation* - While UV radiation can induce **reactive oxygen species** (free radicals) that cause DNA damage, the primary mechanism of malignant transformation leading to skin cancer is the direct formation of pyrimidine dimers. - Free radicals cause a variety of oxidative damage to DNA, proteins, and lipids, but **pyrimidine dimers are unique to UV exposure** and are the main initiators of UV-induced skin cancer. *Direct DNA damage* - This option is too broad; while pyrimidine dimer formation is a form of direct DNA damage, it is the **most specific and significant mechanism** of malignant transformation due to sun exposure [3]. - Non-specific direct DNA damage can also occur from other sources, but the hallmark of UV-induced damage is the creation of **photoproducts like pyrimidine dimers**. *Mutation of p53 due to UV exposure* - **p53 gene mutations** are frequently found in skin cancers, particularly **squamous cell carcinoma**, and are indeed induced by UV radiation. - However, the mutation of p53 is a **consequence** of the initial DNA damage (specifically pyrimidine dimers not being repaired), not the primary mechanism by which sun damage *causes* malignant transformation [2]. The induction of pyrimidine dimers *leads* to these mutations. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, pp. 322-323. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, pp. 332-333. [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. 220-221.

Question 1475: Ataxia telangiectasia is characterized by all of the following except:

A. Chromosomal breakage
B. IgA deficiency
C. Chronic sinopulmonary disease
D. Decreased level of α-fetoprotein (Correct Answer)

Explanation: ***Decreased level of α-fetoprotein*** - Ataxia telangiectasia is typically associated with **elevated levels of α-fetoprotein (AFP)**, not decreased levels, making this the incorrect association. - The high AFP levels are thought to be due to impaired liver development or repair mechanisms related to the ATM gene defect. *Chronic sinopulmonary disease* - Patients with ataxia telangiectasia commonly suffer from **recurrent sinopulmonary infections** due to immune deficiencies, particularly problems with antibody production. - This leads to chronic lung damage, including **bronchiectasis**. *Chromosomal breakage* - A hallmark of ataxia telangiectasia is **increased chromosomal breakage** and genomic instability, particularly in response to ionizing radiation. - This is due to a defect in the **ATM gene**, which is crucial for DNA repair pathways. *IgA deficiency* - **Selective IgA deficiency** or severely reduced IgA levels are frequently observed in individuals with ataxia telangiectasia [1]. - This contributes significantly to their susceptibility to **respiratory and gastrointestinal infections** [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of the Immune System, pp. 250-251.

Question 1476: Which of the following statements is true about apoptosis?

A. Apoptosis is an unregulated process.
B. No inflammation is associated with apoptosis. (Correct Answer)
C. Plasma membrane integrity is lost during apoptosis.
D. Cell swelling and organelle rupture occur during apoptosis.

Explanation: ***Swelling of organelles*** - Apoptosis is characterized by **shrinkage of the cell** and not swelling of organelles, which is more typical of necrosis [1][4]. - During apoptosis, organelles like the mitochondria undergo specific changes, leading to cell death without inflammation [3]. *No inflammation* - Apoptosis is indeed a **non-inflammatory process**, contrasting with necrosis, which typically provokes an inflammatory response [1]. - The cell death in apoptosis occurs quietly without affecting surrounding tissues significantly. *Intact plasma membrane* - During apoptosis, the plasma membrane remains **intact** until the very late stages, unlike in necrosis where it becomes compromised [1]. - The preservation of membrane integrity is crucial for the cell to package its contents effectively. *Affected by dedicated genes* - Apoptosis is regulated by various **genes and signaling pathways**, particularly involving caspases and Bcl-2 family proteins [2][3]. - Genetic factors play a critical role in controlling apoptotic cell death and its proper execution [3]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Cellular Responses to Stress and Toxic Insults: Adaptation, Injury, and Death, pp. 69-71. [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. 63-64. [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. 64-65. [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. 49-50.

Question 1477: Which of the following represents the PRIMARY pathophysiological mechanism underlying age-related changes in articular cartilage?

A. Enzymatic degradation of proteoglycans is increased (Correct Answer)
B. Total water content of cartilage is decreased
C. Synthesis of proteoglycans is decreased
D. Total proteoglycan content is decreased

Explanation: ***Enzymatic degradation of proteoglycans is increased*** - The **primary mechanism** in age-related cartilage degeneration is increased activity of **matrix metalloproteinases (MMPs)** and **aggrecanases** (ADAMTS enzymes) that break down proteoglycans [1]. - This increased enzymatic degradation is the **initiating pathophysiological change** that drives subsequent alterations in cartilage composition and structure [2]. - Understanding this mechanism is crucial for developing therapeutic strategies targeting cartilage preservation. *Synthesis of proteoglycans is decreased* - While proteoglycan synthesis does decline with aging, this is a **secondary change** rather than the primary driving mechanism. - The decrease in synthesis occurs alongside and partly in response to the increased degradative environment. - The key pathophysiological driver is the **imbalance created by increased degradation**, not simply reduced synthesis. *Total water content of cartilage is decreased* - This is **factually incorrect** - water content actually *increases* with aging and early osteoarthritic changes [1]. - Loss of proteoglycans (which normally bind and organize water) leads to increased but **disorganized water content**, reducing cartilage stiffness and load-bearing capacity [1]. *Total proteoglycan content is decreased* - This is a **true consequence** of aging but represents an **end result** rather than the primary mechanism. - The decreased proteoglycan content results from the imbalance between increased enzymatic degradation and decreased synthesis. - Identifying the underlying mechanism (increased degradation) is more important than recognizing the consequence (decreased content). **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Bones, Joints, and Soft Tissue Tumors, pp. 1209-1212. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Osteoarticular And Connective Tissue Disease, pp. 675-676.

Question 1478: A primary structural defect of an organ resulting from an intrinsically abnormal developmental process is termed as:

A. Malformation (Correct Answer)
B. Disruption
C. Deformation
D. Association

Explanation: ***Malformation*** - Refers to a **primary structural defect** present at birth, arising during development, leading to abnormal organ structure. - Typically involves intrinsic factors and can affect any organ or system, making it a key category of congenital anomalies. *Association* - Describes a **non-random occurrence** of two or more anomalies but does not indicate a structural defect of a specific organ. - Does not imply a direct defect, as it can occur without an **underlying structural issue** in a particular organ. *Deformation* - Refers to a change in the **shape or structure** of a normally formed organ or body part due to an external force rather than an intrinsic defect [1]. - Examples include clubfoot or positional plagiocephaly, which are not classified as malformations [1]. *Disruption* - Involves the breakdown of an originally normal tissue or organ due to extrinsic factors, leading to secondary structural defects. - Not inherent to the embryological development process itself, differentiating it from intrinsic faults like malformations. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of Infancy and Childhood, pp. 460-462.

Question 1479: Apoptotic bodies are

A. Clumped chromatin in membrane-bound structures (Correct Answer)
B. Membrane-bound structures containing organelles
C. No nucleus, but contains organelles
D. Pyknotic nucleus in membrane-bound structures

Explanation: ***Cell membrane bound with organelles*** - Apoptotic bodies are **membrane-bound structures** containing remnants of the cell's cytoplasm and organelles, formed during the process of apoptosis. - They are crucial for **phagocytosis** by surrounding macrophages [1], facilitating the safe removal of dying cells. *Pyknotic nucleus without organelles* - This describes a **nucleus that has condensed**, indicating cellular injury rather than the distinct structure of apoptotic bodies. - Apoptotic bodies comprise entire sections of cell contents, including **organelles**, not just a pyknotic nucleus. *No nucleus with organelles* - This option inaccurately suggests an absence of a nucleus, which is not characteristic of apoptotic bodies; they contain **nuclear material** at various stages of condensation. - The presence of organelles indicates that the cell is undergoing controlled death, **not complete degradation**. *Clumped chromatin bodies* - While chromatin can become clumped during apoptosis, this term does not accurately reflect the **entire structure** of apoptotic bodies, which include more than just chromatin. - Apoptotic bodies specifically retain **membrane structures and organelles**, distinguishing them from merely clumped chromatin. **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. 67-69.

Question 1480: Which immunohistochemistry marker is associated with histiocytosis X?

A. CD1a (Correct Answer)
B. CD57
C. CD3
D. CD68

Explanation: ***CD1a*** - **CD1a** is a key immunohistochemical marker for **Langerhans cells**, which are the principal cells involved in **Histiocytosis X** (Langerhans Cell Histiocytosis) [1]. - The presence of **CD1a** helps differentiate Langerhans cell lesions from other histiocytic lesions and is essential for the diagnosis [1]. *CD3* - **CD3** is predominantly a marker for **T lymphocytes**, not associated with histiocytosis or Langerhans cells. - Its presence indicates **T-cell** activation, not histiocytic processes. *CD68* - **CD68** is a marker for **macrophages** and tissue histiocytes but is not specific for Langerhans cells or Histiocytosis X. - While it can be present in various histiocytic conditions, it does not specifically identify Histiocytosis X. *CD57* - **CD57** is typically associated with certain **natural killer (NK) cells** and some **T-cell** subsets, not with histiocytes. - Its presence does not indicate involvement in histiocytic proliferative disorders. **References:** [1] 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, p. 630.

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