General Pathology Practice Questions

Q: What is the primary cause of hydropic change in cells?

Accumulation of water intracellularly. ***Accumulation of water intracellularly*** - Hydropic change, also known as cellular swelling, is primarily due to the **accumulation of water** within the cells caused by various pathological insults [1]. - This process is often seen in conditions such as **reversible cell injury** where the normal ion gradients are disturbed, leading to increased intracellular water [1]. *Glycogen accumulation intracellularly* - Glycogen accumulation is seen in conditions like **diabetes** or **glycogen storage diseases**, which does not lead to hydropic change. - It is characterized by the presence of **cytoplasmic granules** rather than water accumulation. *Fat accumulation intracellularly* - While fat accumulation indicates **lipidosis**, it is distinct from water accumulation and presents as **fat vacuoles** within the cell. - Commonly associated with conditions like **alcoholic liver disease**, not hydropic change. *Lysozyme degeneration* - Lysozyme degeneration relates to the breakdown of cellular components rather than an accumulation of water. - This process can lead to **cellular damage and necrosis**, but is not a direct cause of hydropic change. **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. 51-53.

Q: Which of the following is an example of coagulative necrosis?

Acute tubular necrosis. ***Acute tubular necrosis*** - It is characterized by **coagulative necrosis** in the renal tubules due to ischemia or toxic injury . - This type of necrosis leads to **cellular swelling**, loss of cellular architecture, but maintains the basic outline of the tissue . *Malignant hypertension* - This condition leads to **fibrinoid necrosis** in the blood vessels rather than coagulative necrosis. - Characterized by severe hypertension causing vascular damage and organ dysfunction but does not exemplify coagulative necrosis. *Acute pancreatitis* - Associated with **fat necrosis** due to the action of pancreatic enzymes on adipose tissue. - Does not demonstrate coagulative necrosis since the process involves the dissolution of fat rather than cell structure preservation. *Stroke* - Typically results in **liquefactive necrosis**, especially in the brain, rather than coagulative necrosis. - In stroke cases, the brain tissue becomes soft and liquid-like due to necrosis, not preserving tissue architecture as seen in coagulative 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, pp. 51-55.

Q: What is the earliest detectable cellular change following injury?

Diminished ATP. ***Mitochondrial dysfunction*** [1] - Mitochondrial dysfunction is often the **first metabolic change** following cellular injury, impacting ATP production [1]. - Since mitochondria are crucial for energy homeostasis, dysfunction can lead to severe cellular effects and initiate the injury cascade [1]. *Diminished ATP* [1] - While diminished ATP is a consequence of injury, it is not the **initial sign**; it results from mitochondrial dysfunction [1]. - ATP depletion typically occurs **after** mitochondrial impairment has begun, indicating further progression of injury [1]. *Membrane damage* [1] - Membrane integrity can be compromised due to **various insults**, but this happens **after** mitochondrial dysfunction when the cell's economy fails [1]. - Early injury signs primarily involve **functional deficits** rather than structural changes like membrane damage [1]. *Release of lysosomal enzymes* - Release of lysosomal enzymes indicates **cell death** or severe cellular injury, which occurs later in the injury process. - It is not a primary indicator, but rather a response to **critical conditions** post-injury. **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. 49-62.

Q: What is the first stage of tissue damage in an alkali burn?

Liquefactive necrosis. ***Liquefactive necrosis*** - Alkali burns cause **liquefactive necrosis** as the **first stage of tissue damage**, which is the hallmark mechanism of alkali injury. - The alkali reacts with tissue lipids causing **saponification of fats** and **protein denaturation**, resulting in dissolution and liquefaction of tissues. - This liquefactive process allows the alkali to **penetrate deeper** into tissues progressively, causing ongoing and extensive damage as it continues to dissolve cellular structures. - This is why alkali burns are generally more severe than acid burns, despite potentially appearing less dramatic initially. *Coagulation necrosis* - **Coagulation necrosis** is characteristic of **acid burns**, not alkali burns. - Acids cause proteins to coagulate and denature, forming a **protective eschar** (dry, hard layer). - This eschar acts as a barrier that **limits penetration** of the acid into deeper tissues, often resulting in less extensive damage compared to alkali burns. *Tissue necrosis* - **Tissue necrosis** is a general term for cell death but does not specify the mechanism or type. - While liquefactive necrosis is indeed a type of tissue necrosis, this option is **too broad and non-specific** to answer what the first stage of damage is. - The question requires identification of the specific **pattern or mechanism** of necrosis, not just a general acknowledgment that cell death occurs. *Full thickness necrosis* - **Full-thickness necrosis** describes the **extent or depth** of tissue damage (involving all layers), not the mechanism or type of cellular injury. - While severe alkali burns can eventually progress to full-thickness necrosis, this is a **consequence of progressive liquefaction**, not the initial cellular process. - This term describes "how deep" rather than "how" the damage occurs.

Q: Neurofibromatosis shows which of the following mode of inheritance ?

AD. ***AD*** - **Neurofibromatosis type 1 (NF1)** and **Neurofibromatosis type 2 (NF2)** are both classic examples of **autosomal dominant (AD)** inheritance [1]. - This means that only one copy of the altered gene (on a non-sex chromosome) is sufficient to cause the disorder, and there is a **50% chance** of passing the condition to each child [1]. *AR* - **Autosomal recessive (AR)** disorders require two copies of the altered gene (one from each parent) for the condition to manifest [1]. - Examples include **cystic fibrosis** and **sickle cell anemia**, which have a different pattern of inheritance than neurofibromatosis. *X linked dominant* - **X-linked dominant** disorders are caused by a mutation on the X chromosome, where only one copy of the mutated gene is needed for the condition to appear [1]. - These disorders typically affect females more often than males and show a specific inheritance pattern through X chromosome transmission, which is not seen in neurofibromatosis. *X linked recessive* - **X-linked recessive** disorders are also caused by mutations on the X chromosome but typically affect males more severely as they only have one X chromosome [1]. - Females are often carriers, and the inheritance pattern differs significantly from the clinical presentation and genetic transmission of neurofibromatosis. **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.

Q: Which of the following conditions is characterized by the absence of Barr bodies?

Turner syndrome. ***Turner syndrome*** - Females with **Turner syndrome** have a 45,XO karyotype, meaning they have only one X chromosome. - Since a **Barr body** is formed from the inactivation of one X chromosome in normal females (46,XX), individuals with Turner syndrome have **no Barr bodies** due to the absence of a second X chromosome. *Klinefelter syndrome* - Individuals with **Klinefelter syndrome** typically have a 47,XXY karyotype, meaning they have two X chromosomes. - The presence of two X chromosomes leads to the formation of **one Barr body** (from inactivation of one of the two X chromosomes), making this option incorrect. *Down's syndrome* - **Down's syndrome** is caused by trisomy 21 (extra copy of chromosome 21), which is an autosomal abnormality. - The number of Barr bodies in individuals with Down's syndrome depends on their sex chromosome complement (normal pattern: 46,XX females have one Barr body, 46,XY males have none). *Marfan's syndrome* - **Marfan's syndrome** is an autosomal dominant disorder affecting connective tissue, caused by a mutation in the **FBN1 gene**. - This condition does not involve abnormalities in sex chromosomes, so the number of Barr bodies follows the normal pattern (one in 46,XX females, none in 46,XY males).

Q: In which condition are positive Periodic Acid-Schiff (PAS) macrophages typically observed?

Whipple's disease. ***Whipple's disease*** - **Whipple's disease** is characterized by the presence of **foamy macrophages** in the lamina propria of the small intestine [1]. - These macrophages contain intracellular rod-shaped bacilli and are strongly **Periodic Acid-Schiff (PAS)-positive** due to the presence of bacterial glycoproteins [1]. *Crohn's disease* - Crohn's disease is an **inflammatory bowel disease** characterized by transmural inflammation and non-caseating granulomas. - While macrophages are present, they are not typically **PAS-positive** in the distinctive way seen in Whipple's disease. *AIDS* - AIDS (Acquired Immunodeficiency Syndrome) is caused by the **Human Immunodeficiency Virus (HIV)** and leads to immune compromise. - While various opportunistic infections and pathologies can occur, **PAS-positive macrophages** are not a characteristic diagnostic feature of HIV/AIDS itself. *None of the options* - This option is incorrect because **Whipple's disease** clearly matches the description of having positive PAS macrophages. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, pp. 798-799.

Q: Caseating necrosis most commonly occurs in

Lung. ***lung*** - **Caseating necrosis** is classically associated with **tuberculosis**, which primarily affects the lungs [1]. - It is characterized by the presence of **granulomatous inflammation**, often leading to the formation of cavities in pulmonary tissue. *Brain* - While certain infections can lead to necrosis in the brain, they typically do not present as **caseating necrosis**, which is specific to certain conditions like tuberculosis. - The brain may show **liquefactive necrosis** or other types of necrosis, rather than **caseation**. *liver* - The liver usually shows **macrovesicular steatosis** or **apoptosis** in conditions like hepatitis, not caseating necrosis. - **Granulomatous hepatitis** can occur, but it does not typically result in **caseating** type necrosis associated with lung pathology. *kidney* - The kidneys can experience necrosis from various causes, but caseating necrosis is not typical; they are more often involved in **focal segmental glomerulosclerosis** or **acute tubular necrosis**. - Chronic kidney conditions may involve granulomas, but they usually are not characterized by **caseation** similar to that seen in pulmonary tissue. **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.

Question 1

What is the primary cause of hydropic change in cells?

Accepted Answer

Accumulation of water intracellularly

Answer

Fat accumulation intracellularly

Answer

Glycogen accumulation intracellularly

Answer

Lysosomal degeneration

Question 2

Which of the following is an example of coagulative necrosis?

Accepted Answer

Acute tubular necrosis

Answer

Stroke

Answer

Malignant hypertension

Answer

Acute pancreatitis

Question 3

What is the earliest detectable cellular change following injury?

Accepted Answer

Diminished ATP

Answer

Membrane damage

Answer

Release of lysosomal enzymes

Answer

Mitochondrial dysfunction

Question 4

What is the first stage of tissue damage in an alkali burn?

Accepted Answer

Liquefactive necrosis

Answer

Coagulation necrosis

Answer

Tissue necrosis

Answer

Full thickness necrosis

Question 5

Neurofibromatosis shows which of the following mode of inheritance ?

Accepted Answer

AD

Answer

AR

Answer

X linked dominant

Answer

X linked recessive

Question 6

Which of the following conditions is characterized by the absence of Barr bodies?

Accepted Answer

Turner syndrome

Answer

Klinefelter syndrome

Answer

Down's syndrome

Answer

Marfan's syndrome

Question 7

In which condition are positive Periodic Acid-Schiff (PAS) macrophages typically observed?

Accepted Answer

Whipple's disease

Answer

None of the options

Answer

AIDS

Answer

Crohn's disease

Question 8

What is the key pathophysiological difference between acid and alkali injuries in terms of tissue necrosis?

Accepted Answer

Alkali injuries cause liquefactive necrosis

Answer

Acid injuries cause coagulative necrosis

Answer

Alkali injuries lead to deeper tissue damage

Answer

Acid injuries are less severe than alkali injuries

Question 9

Which of the following proteins serves as the PRIMARY executioner in the apoptotic pathway by directly cleaving cellular substrates?

Accepted Answer

Caspases

Answer

Cytochrome C

Answer

Apaf-1

Answer

Bcl-2

Question 10

Caseating necrosis most commonly occurs in

Accepted Answer

Lung

Answer

Brain

Answer

Liver

Answer

Kidney

General Pathology — MCQs

General Pathology — MCQs

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