General Pathology Practice Questions

Q: Which of the following is NOT a component of Virchow's triad?

Hypotension. ***Hypotension*** - **Hypotension** (low blood pressure) is not a component of Virchow's triad for thrombosis - While hypotension can affect blood flow, it is not one of the classic three factors described by Rudolf Virchow - Virchow's triad specifically consists of: endothelial injury, stasis/abnormal blood flow, and hypercoagulability *Endothelial injury* - Damage to the **blood vessel wall lining** is a key component of Virchow's triad - Causes include trauma, surgery, inflammation, atherosclerosis, and medical devices (catheters, stents) - Exposed subendothelial collagen triggers platelet adhesion and activation of the coagulation cascade *Stasis* - **Abnormal or stagnant blood flow** is the second component of Virchow's triad - Occurs in prolonged immobility, atrial fibrillation, venous obstruction, or varicose veins - Slow flow prevents dilution of activated clotting factors and allows platelet-endothelial interaction *Hypercoagulability* - **Increased tendency to form blood clots** is the third component of Virchow's triad - Can be inherited (Factor V Leiden, Prothrombin G20210A mutation, Protein C/S deficiency) or acquired - Acquired causes include malignancy, pregnancy, oral contraceptives, smoking, and nephrotic syndrome

Q: Which of the following cellular changes is reversible?

Bleb formation. ***Bleb formation*** - **Bleb formation** is a reversible cellular injury process, typically indicating the cell is under stress but not necessarily dead [1,3]. - This process can be a result of **cell swelling**, often due to acute cell injury, which can resolve if the stressor is removed [2,4]. *Karyolysis* - **Karyolysis** refers to the dissolution of the cell nucleus, often indicating irreversible injury leading to cell death (necrosis) [1]. - This process is often associated with **loss of nuclear material**, which is not reversible [1]. *Pyknosis* - **Pyknosis** signifies nuclear condensation and is typically an irreversible process, indicating that the cell is undergoing necrosis [1]. - Cells with **pyknosis** have lost their viability and will not return to a healthy state [1]. *Pyknosis* - As mentioned, **pyknosis** indicates nuclear shrinkage and is an irreversible change, consistent with cell death [1]. - It is a common finding in **necrotic cells**, further demonstrating its non-reversible nature [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, p. 53. [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. 49-50. [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. 51-53.

Q: What is the definition of lipofuscin?

Wear and tear pigment. ***Wear and tear pigment*** - Lipofuscin is known as **wear and tear pigment** that accumulates in cells over time, especially in aging cells [1]. - It is a byproduct of **cellular lipid peroxidation** and protein degradation, indicative of oxidative stress [1]. *Form of calcification* - Not to be confused with calcification, lipofuscin is a **pigment** and not related to calcium deposition [1]. - Calcification usually occurs in response to tissue injury or necrosis, which differs fundamentally from lipofuscin accumulation. *Fat deposits* - Lipofuscin is made up of **an insoluble complex** and is not classified simply as fat or fat deposits [1]. - It is the result of the **degradation of cellular components**, rather than the accumulation of unutilized fats [1]. *Blood pigment* - Lipofuscin is not derived from **hemoglobin** or any blood components, distinguishing it from true blood pigments like **bilirubin**. - It is associated with **cellular aging** rather than with any specific blood function or metabolism [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. 75-77.

Q: What causes the brown color of a contusion?

Hemosiderin. ***Hemosiderin*** - The brown color of a contusion is primarily due to **hemosiderin**, an iron-storage complex formed from the breakdown of **hemoglobin**. - As red blood cells trapped in the tissue degrade, their iron is released and converted into hemosiderin, which has a distinct reddish-brown to brown hue. *Decomposed hemoglobin* - While hemoglobin does decompose, it breaks down into stages that result in different colors (**biliverdin** for green, **bilirubin** for yellow), before the formation of hemosiderin. - The direct "decomposition" itself isn't the primary cause of the enduring brown color, but rather the subsequent iron deposition. *Bilirubin breakdown products* - **Bilirubin** is formed from the breakdown of **biliverdin**, which gives contusions their yellow color late in the healing process. - This stage precedes or coexists with the brown color, but bilirubin itself is responsible for the yellow, not the brown. *Methemoglobin* - **Methemoglobin** is an oxidized form of hemoglobin that can cause a **bluish-brown** discoloration, often seen in conditions like methemoglobinemia. - While it can manifest in some bruises, it is not the primary or universal cause of the typical brown color of a resolving contusion; that is usually due to iron deposition.

Q: Caseous necrosis is seen in -

Tuberculosis. ***Tuberculosis*** - **Caseous necrosis** is the **pathognomonic** and **most characteristic** form of necrosis seen in **tuberculosis (TB)** caused by *Mycobacterium tuberculosis* [1]. - It appears as a **cheesy, friable, granular material** in the center of **tuberculous granulomas** (tubercles) [1], [2]. - The unique **lipid-rich cell wall** of *M. tuberculosis* combined with the host's **type IV hypersensitivity reaction** results in this distinctive pattern of tissue destruction [2]. - This is a **classic histopathological hallmark** of TB and is essential for diagnosis [2]. *Treponemal infection* - **Syphilis**, caused by *Treponema pallidum*, causes **gummatous necrosis**, NOT caseous necrosis [3]. - Gummas have a **rubbery consistency** and different histological appearance compared to the cheesy, friable caseous necrosis. - While syphilis produces granulomatous inflammation, the necrosis pattern is distinctly different from TB [3]. *CMV infection* - **Cytomegalovirus (CMV)** infection typically causes **coagulative necrosis** with **cytopathic effects** (enlarged cells with intranuclear and intracytoplasmic inclusions - "owl's eye" appearance) [3]. - Does NOT produce caseous necrosis. *Staphylococcal infection* - **Staphylococcal infections** (e.g., *Staphylococcus aureus*) cause **liquefactive necrosis** leading to **abscess formation** [3]. - Dead cells are enzymatically digested into **liquid pus**, completely different from the solid, cheesy appearance of caseous 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, p. 55. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Infectious Diseases, pp. 383-384. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Infectious Diseases, p. 360.

Q: What is the major fibril protein associated with Primary Amyloidosis?

Immunoglobulin Light Chain. ***AL*** - In Primary Amyloidosis, **AL amyloid** is derived from immunoglobulin light chains produced by **plasma cell dyscrasias** [1]. - This type of amyloidosis is commonly associated with conditions like **multiple myeloma** or monoclonal gammopathy [1]. *Transthyretin* - This protein is associated with **Familial Amyloid Polyneuropathy** and **Senile Systemic Amyloidosis**, not Primary Amyloidosis. - Transthyretin amyloidosis (ATTR) results from **mutations** or **aging**, contributing to different clinical presentations than AL. *AA* - AA amyloidosis is secondary and occurs due to **chronic inflammatory** conditions, such as rheumatoid arthritis or chronic infections. - It is not the main fibril protein in **Primary Amyloidosis**, which is specifically linked to **light chains**. *Procalcitonin* - Procalcitonin is a **biomarker** used primarily for diagnosing bacterial infections, particularly sepsis, and is not involved in amyloidogenesis. - It does not relate to amyloidosis and is not a component of amyloid fibrils. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of the Immune System, pp. 266-267.

Q: Which of the following is a sign of reversible injury in alcoholic liver disease?

Cytoplasmic vacuole. ***Cytoplasmic vacuole*** - The presence of **cytoplasmic vacuoles** in liver cells indicates fatty change, which is a **reversible injury** in alcoholic liver disease [1][2]. - This injury allows the liver to recover if **alcohol consumption** is ceased, highlighting its reversible nature [1]. *Nuclear karyolysis* - **Nuclear karyolysis** signifies severe cellular damage and necrosis, indicating an irreversible process [2]. - This feature involves the dissolution of the nucleus, which does not align with reversible injury. *Loss of cell membrane* - Loss of the **cell membrane** indicates irreversible damage, leading to cell death rather than a reversible condition [2]. - This change is associated with significant cellular impairment, contrary to the concept of recovery. *Pyknosis* - **Pyknosis**, the condensation of chromatin in the nucleus, suggests irreversible cellular injury and impending necrosis [2]. - It is often a precursor to cell death and is not indicative of reversible damage in liver pathology. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Liver and Gallbladder, pp. 848-850. [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. 51-53.

Question 1

Which type of necrosis is most commonly associated with the spread of infection?

Accepted Answer

Liquefactive necrosis

Answer

Fibrinoid necrosis

Answer

Fat necrosis

Answer

Coagulative necrosis

Question 2

Which of the following is NOT a component of Virchow's triad?

Accepted Answer

Hypotension

Answer

Endothelial injury

Answer

Stasis

Answer

Hypercoagulability

Question 3

Which of the following is not considered an example of excess tissue growth?

Accepted Answer

Granulation tissue

Answer

Neoplasia

Answer

Hyperplasia

Answer

Fibrosis

Question 4

Which of the following cellular changes is reversible?

Accepted Answer

Bleb formation

Answer

Pyknosis

Answer

Karyorrhexis

Answer

Karyolysis

Question 5

Which molecule is primarily responsible for nuclear fragmentation during apoptosis?

Accepted Answer

Caspases

Answer

Apaf - 1

Answer

Oxygen free radicals

Answer

Endonuclease G

Question 6

What is the definition of lipofuscin?

Accepted Answer

Wear and tear pigment

Answer

Fat deposits

Answer

Blood pigment

Answer

Form of calcification

Question 7

What causes the brown color of a contusion?

Accepted Answer

Hemosiderin

Answer

Decomposed hemoglobin

Answer

Bilirubin breakdown products

Answer

Methemoglobin

Question 8

Caseous necrosis is seen in -

Accepted Answer

Tuberculosis

Answer

CMV infection

Answer

Treponemal infection

Answer

Staphylococcal infection

Question 9

What is the major fibril protein associated with Primary Amyloidosis?

Accepted Answer

Immunoglobulin Light Chain

Answer

Amyloid Associated protein (AA)

Answer

Procalcitonin (PCT)

Answer

Transthyretin (TTR)

Question 10

Which of the following is a sign of reversible injury in alcoholic liver disease?

Accepted Answer

Cytoplasmic vacuole

Answer

Pyknosis (nuclear shrinkage)

Answer

Loss of cell membrane integrity

Answer

Nuclear karyolysis (nuclear dissolution)

General Pathology — MCQs

General Pathology — MCQs

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