General Pathology Practice Questions

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

AA amyloid. ***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.

Q: White infarcts are seen in all the following organs except:

Lung. ***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.

Q: Ataxia telangiectasia is characterized by all of the following except:

Decreased level of α-fetoprotein. ***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.

Q: Which of the following statements is true about apoptosis?

No inflammation is associated with apoptosis.. ***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.

Q: Which immunohistochemistry marker is associated with histiocytosis X?

CD1a. ***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.

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

Malformation. ***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.

Q: Apoptotic bodies are

Clumped chromatin in membrane-bound structures. ***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 1

Amyloidosis is associated with all of the following conditions except:

Accepted Answer

Acute inflammatory conditions

Answer

Multiple myeloma

Answer

Renal failure

Answer

Chronic inflammatory conditions

Question 2

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

Accepted Answer

AA amyloid

Answer

Amyloid light chain

Answer

ATTR

Answer

Amyloid beta (Aβ)

Question 3

White infarcts are seen in all the following organs except:

Accepted Answer

Lung

Answer

Kidney

Answer

Heart

Answer

Spleen

Question 4

Ataxia telangiectasia is characterized by all of the following except:

Accepted Answer

Decreased level of α-fetoprotein

Answer

Chromosomal breakage

Answer

IgA deficiency

Answer

Chronic sinopulmonary disease

Question 5

Sun damage causes malignant transformation of the skin by:

Accepted Answer

Induction of pyrimidine dimers

Answer

Direct DNA damage

Answer

Free radical formation

Answer

Mutation of p53 due to UV exposure

Question 6

Which of the following statements is true about apoptosis?

Accepted Answer

No inflammation is associated with apoptosis.

Answer

Apoptosis is an unregulated process.

Answer

Plasma membrane integrity is lost during apoptosis.

Answer

Cell swelling and organelle rupture occur during apoptosis.

Question 7

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

Accepted Answer

Enzymatic degradation of proteoglycans is increased

Answer

Total water content of cartilage is decreased

Answer

Synthesis of proteoglycans is decreased

Answer

Total proteoglycan content is decreased

Question 8

Which immunohistochemistry marker is associated with histiocytosis X?

Accepted Answer

CD1a

Answer

CD57

Answer

CD3

Answer

CD68

Question 9

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

Accepted Answer

Malformation

Answer

Disruption

Answer

Deformation

Answer

Association

Question 10

Apoptotic bodies are

Accepted Answer

Clumped chromatin in membrane-bound structures

Answer

Membrane-bound structures containing organelles

Answer

No nucleus, but contains organelles

Answer

Pyknotic nucleus in membrane-bound structures

General Pathology — MCQs

General Pathology — MCQs

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