General Pathology — MCQs
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A 28-year-old woman presents with shortness of breath and cough. A chest X-ray reveals multiple bilateral lung nodules. A biopsy shows multinucleated giant cells and asteroid bodies. What is the most likely diagnosis?
Which feature of a burn injury is most important in determining whether it was caused by a chemical or thermal source?
Which condition is associated with 'apple-green birefringence' under polarized light when stained with Congo red?
Which of the following is considered the prototype anti-apoptotic gene?
Vitamin A deficiency leads to metaplasia of which type of epithelium?
What is the characteristic feature of thermal injury in tissues?
Which stain is used for staining the nucleus?
Blebs are associated with which type of cell injury?
Which of the following conditions is the best example of both physiological hyperplasia and hypertrophy?
Dystrophic calcification is associated with which of the following conditions?
General Pathology Indian Medical PG Practice Questions and MCQs
Question 1381: A 28-year-old woman presents with shortness of breath and cough. A chest X-ray reveals multiple bilateral lung nodules. A biopsy shows multinucleated giant cells and asteroid bodies. What is the most likely diagnosis?
- A. Tuberculosis
- B. Sarcoidosis (Correct Answer)
- C. Wegener granulomatosis
- D. Pneumoconiosis
Explanation: ***Sarcoidosis*** - The presence of **multinucleated giant cells** and **asteroid bodies** on biopsy is characteristic of sarcoidosis [1]. - Chest X-ray findings of **bilateral lung nodules** further support this diagnosis as sarcoidosis often presents with such manifestations in the lungs [1]. *Wegener granulomatosis* - Typically involves **necrotizing granulomatous inflammation** affecting the respiratory tract and kidneys but does not show asteroid bodies. - Also associated with **ANCA** positivity, which is not indicated in this case. *Tuberculosis* - Generally presents with **cavitary lesions** and caseating granulomas, differing from the non-caseating type seen in sarcoidosis. - Other common symptoms include **night sweats** and **hemoptysis**, which are not mentioned here. *Pneumoconiosis* - Results from **inhalation of mineral dust**, typically showing a different pattern on imaging such as **nodules** primarily in upper lung fields. - Would not present with **multinucleated giant cells** or asteroid bodies in a biopsy. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Lung, pp. 700-701.
Question 1382: Which feature of a burn injury is most important in determining whether it was caused by a chemical or thermal source?
- A. Type of tissue damage
- B. Depth of burn (e.g., superficial, partial thickness, full thickness)
- C. Presence of blisters (e.g., size, number, and characteristics of blisters)
- D. Pattern of injury (e.g., splash marks, scalding patterns) (Correct Answer)
Explanation: ***Pattern of injury (e.g., splash marks, scalding patterns)*** - **Pattern of injury** is the **most important forensic feature** for differentiating chemical from thermal burns in practice. - **Chemical burns** characteristically show **irregular splash patterns**, **drip marks**, **contact outlines**, and may have **sharp demarcation** following liquid flow or contact with clothing [1]. - **Thermal burns** show patterns consistent with the heat source: **immersion burns** have clear waterlines (stocking-glove distribution), **flame burns** have irregular edges with **singed hair**, **contact burns** replicate the shape of the hot object. - The **distribution and configuration** provide immediate diagnostic clues that are often definitive in forensic investigations. *Type of tissue damage* - While chemical burns can theoretically cause specific necrosis patterns (coagulation with acids, liquefaction with alkalis), in practice there is **significant overlap** with thermal injury [1]. - By the time histological examination occurs, **both chemical and thermal burns often appear identical** microscopically, showing coagulation necrosis. - Microscopic examination is **less reliable** than macroscopic pattern recognition for determining burn etiology. *Depth of burn (e.g., superficial, partial thickness, full thickness)* - **Burn depth alone cannot differentiate** between chemical and thermal causes, as both can produce any degree of depth depending on duration and intensity of exposure [1]. - A full-thickness burn can result from prolonged thermal contact or strong chemical exposure. *Presence of blisters (e.g., size, number, and characteristics of blisters)* - **Blisters** occur in partial-thickness burns from **both chemical and thermal sources** and do not reliably indicate etiology. - While blister characteristics may vary, this feature is **not diagnostic** for differentiating the cause of the burn. **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. 59-60.
Question 1383: Which condition is associated with 'apple-green birefringence' under polarized light when stained with Congo red?
- A. Rheumatoid arthritis
- B. Systemic lupus erythematosus
- C. Amyloidosis (Correct Answer)
- D. Scleroderma
Explanation: ***Amyloidosis*** [1] - Characterized by the deposition of **amyloid proteins** [2], which show **apple-green birefringence** on polarized light when stained with Congo red [1]. - This distinctive finding is crucial for diagnosing **systemic and localized amyloidosis** conditions [1][3]. *Scleroderma* - Involves **collagen deposition** and does not show birefringence characteristic of amyloid when stained with Congo red. - Symptoms include **skin thickening** and **Raynaud's phenomenon**, but lack the signature Congo red staining findings. *Rheumatoid arthritis* - Primarily affects synovial joints and is associated with **rheumatoid factor** and **anti-CCP antibodies**, without any association with amyloid deposits. - The condition primarily involves ***inflammation*** rather than amyloid-related pathology. *Systemic lupus erythematosus* - An autoimmune disorder with a wide range of symptoms but does not exhibit apple-green birefringence in Congo red staining. - Characterized by **antibody production** and multi-organ involvement, but lacks the amyloid deposition seen in amyloidosis. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of the Immune System, pp. 268-269. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of the Immune System, pp. 264-266. [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. 135-136.
Question 1384: Which of the following is considered the prototype anti-apoptotic gene?
- A. Bcl-xL
- B. Bax
- C. Bcl-2 (Correct Answer)
- D. Mcl-1
Explanation: ***Bcl-2*** - **Bcl-2** (B-cell lymphoma 2) was the first anti-apoptotic gene discovered and is considered the prototype due to its role in preventing programmed cell death [1]. - Its overexpression is commonly seen in lymphomas and other cancers, where it helps cancer cells survive by inhibiting apoptosis [2]. *Bax* - **Bax** is a pro-apoptotic member of the Bcl-2 family, meaning it promotes cell death rather than preventing it [3]. - It forms pores in the mitochondrial membrane, leading to the release of **cytochrome c** and activation of caspases [4]. *Bcl-xL* - **Bcl-xL** is another anti-apoptotic protein belonging to the Bcl-2 family, sharing functional similarities with Bcl-2 [3]. - While it has anti-apoptotic activity, it was discovered later than Bcl-2 and is not considered the original prototype. *Mcl-1* - **Mcl-1** (Myeloid cell leukemia sequence 1) is an anti-apoptotic protein that is also a member of the Bcl-2 family [3]. - It plays a crucial role in the survival of various cell types, including myeloid cells, but it is not the prototype anti-apoptotic gene. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, pp. 310-311. [2] 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, pp. 602-604. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, p. 310. [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. 64-65.
Question 1385: Vitamin A deficiency leads to metaplasia of which type of epithelium?
- A. None of the options
- B. Columnar epithelium (Correct Answer)
- C. Cuboidal epithelium
- D. Squamous epithelium
Explanation: ***Squamous epithelium*** - Vitamin A deficiency leads to a condition known as **xerophthalmia**, which involves the metaplasia of conjunctival epithelium from columnar to **squamous** type [1]. - It is crucial for maintaining the integrity of **epithelial tissues**, particularly in the respiratory and gastrointestinal tracts, leading to squamous metaplasia [1]. *None* - This option fails to recognize that **metaplasia** occurs specifically in response to deficiency of vitamin A. - The implication that no changes occur is incorrect, as significant alterations to epithelial types are noted in deficiency states [1]. *Columnar epithelium* - While columnar epithelium can undergo metaplasia, it typically becomes squamous in vitamin A deficiency, not remaining solely columnar [2]. - Conditions like intestinal metaplasia occur due to other pathways, such as chronic irritation, not directly linked to vitamin A deficiency. *Both* - This option suggests metaplasia in both epithelium types, which is misleading as vitamin A deficiency primarily affects **squamous** epithelium, not columnar directly [1]. - The typical response is a loss of **columnar** cells and their replacement with **squamous** cells, rather than dual metaplasia [2]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Central Nervous System Synapse, pp. 445-446. [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, p. 49.
Question 1386: What is the characteristic feature of thermal injury in tissues?
- A. Coagulation necrosis of tissue proteins (Correct Answer)
- B. Ruptured blood vessels or clotted blood
- C. Irregular margins due to thermal damage
- D. Smooth tissue margins due to healing
Explanation: ***Coagulation necrosis of tissue proteins*** - **Thermal injury** causes cell proteins to **denature** and coagulate, leading to cell death and the formation of a solid, opaque mass. - This process is characteristic of **coagulation necrosis**, where the basic tissue architecture is preserved for a period due to enzyme inactivation. *Irregular margins due to thermal damage* - While thermal damage can result in irregular margins, this is a **gross morphological feature** rather than the fundamental cellular and biochemical characteristic of thermal injury. - **Coagulation necrosis** is the underlying histological change that explains the tissue's appearance. *Ruptured blood vessels or clotted blood* - **Ruptured blood vessels** and **clotted blood** can occur with thermal injury, particularly in severe burns, but these are secondary effects or complications, not the primary "characteristic feature" of the tissue injury itself. - The fundamental characteristic is the **denaturation** of cellular proteins. *Smooth tissue margins due to healing* - **Smooth tissue margins** are typically associated with the **healing process** (e.g., re-epithelialization, scar formation) much later in the course after the initial thermal injury. - This option describes a **late-stage reparative process**, not the immediate characteristic feature of acute thermal tissue damage.
Question 1387: Which stain is used for staining the nucleus?
- A. Safranin
- B. Fast green
- C. Hematoxylin (Correct Answer)
- D. Erythrosine
Explanation: ***Hematoxylin*** - **Hematoxylin** is a basic dye that stains **acidic structures** like the **nucleic acids** (DNA and RNA) in the nucleus a **blue-purple** color. - It is extensively used in **histology and pathology** to visualize cell nuclei, making it a cornerstone of the **hematoxylin and eosin (H&E) stain**. *Safranin* - **Safranin** is a basic dye often used as a counterstain in some protocols and stains **collagen** and **mast cell granules** reddish-orange. - It is also used in bacteriology to stain gram-negative bacteria **red**. *Fast green* - **Fast green** is an acidic dye that stains **basic proteins** in the **cytoplasm and collagen** green or blue-green. - It is commonly used as a counterstain in plant histology or in combination with other dyes to highlight specific tissue components. *Erythrosine* - **Erythrosine** is a pink/red acidic dye used as a counterstain, primarily staining **protein-rich cytoplasm** and other basic structures pink. - It is less commonly used in routine histology compared to eosin, but can be found in some specialized staining methods.
Question 1388: Blebs are associated with which type of cell injury?
- A. Reversible
- B. Irreversible
- C. Both (Correct Answer)
- D. None of the options
Explanation: ***Correct: Both*** - Blebs (surface membrane protrusions) are associated with **both reversible and irreversible cell injury** - In **reversible injury**: cellular swelling causes cytoskeletal disruption leading to bleb formation; these blebs can resolve if the injurious stimulus is removed - In **irreversible injury**: more extensive and widespread blebbing occurs during apoptosis and necrosis, associated with cell death pathways - The key difference is in the **extent and reversibility**, not the presence or absence of blebs *Incorrect: Reversible* - While blebs do occur in reversible injury, this option is incomplete as it excludes their occurrence in irreversible injury - Blebs are seen in both types of cellular injury, making "reversible" alone an inadequate answer *Incorrect: Irreversible* - While blebs are prominent in irreversible injury (apoptosis and necrosis), they also occur in reversible injury - Standard pathology texts (Robbins) describe bleb formation as a feature of cellular swelling in reversible injury - This option is incomplete as it excludes reversible injury *Incorrect: None of the options* - This is incorrect because blebs are definitively associated with cell injury (both reversible and irreversible types) - Bleb formation is a well-recognized morphological change in cellular pathology
Question 1389: Which of the following conditions is the best example of both physiological hyperplasia and hypertrophy?
- A. Uterus during pregnancy (Correct Answer)
- B. None of the options
- C. Skeletal muscle in athletes
- D. Breast tissue at puberty
Explanation: ***Uterus during pregnancy (both hyperplasia and hypertrophy)*** - The **smooth muscle cells** of the uterus undergo both an increase in number (**hyperplasia**) and an increase in size (**hypertrophy**) during pregnancy to accommodate the growing fetus [2]. - This is a classic example of a **physiological adaptation** to increased functional demand, driven by estrogenic stimulation [1], [2]. *Skeletal muscle in athletes (hypertrophy only)* - **Skeletal muscle** primarily adapts to increased workload (e.g., in athletes) through an increase in the size of individual muscle fibers (**hypertrophy**) [1]. - Skeletal muscle cells are typically **post-mitotic**, meaning they generally do not undergo cell division, so **hyperplasia** is not a significant component of this adaptation. *Breast tissue at puberty (primarily hyperplasia with some hypertrophy)* - Breast development at puberty is primarily characterized by the proliferation of glandular tissue and ducts (**hyperplasia**), influenced by hormonal changes [1]. - While there is some increase in the size of individual cells (**hypertrophy**), hyperplasia is the dominant process, often described as an example of physiological hyperplasia rather than a balanced combination of both. *None of the options* - This option is incorrect because the uterus during pregnancy perfectly illustrates both **physiological hyperplasia and hypertrophy** [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. 85-88. [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. 45-46.
Question 1390: Dystrophic calcification is associated with which of the following conditions?
- A. Milk alkali syndrome
- B. Hyperparathyroidism
- C. Vitamin A intoxication
- D. Atheromatous plaques and other conditions. (Correct Answer)
Explanation: ***Atheromatous plaque*** - Dystrophic calcification occurs in areas of **tissue damage** and is commonly observed in atheromatous plaques, where lipid accumulation leads to inflammation and calcification. - This type of calcification is a result of **necrosis** or tissue injury, typically seen in the vascular system, particularly in **atherosclerotic lesions**. *Vitamin A intoxication* - Vitamin A toxicity is characterized by **hypervitaminosis A**, which can lead to symptoms such as **nausea**, **headaches**, and **blurred vision**, but is not directly linked to dystrophic calcification. - The calcifications often associated with vitamin A excess are more related to **metabolic processes** rather than **dystrophic calcification** in damaged tissue. *Milk alkali syndrome* - Milk alkali syndrome is caused by excessive intake of **calcium** and **alkali**, leading to **hypercalcemia** and potentially **metastatic calcification** [1][2], not dystrophic calcification. - It manifests with symptoms like **nausea**, **vomiting**, and **altered mental status**, but does not involve the same mechanism of tissue damage as seen in dystrophic calcification. *Hyperparathyroidism* - This condition can cause **hypercalcemia** and **metastatic calcification** [1][2] due to increased calcium levels in the blood, primarily affecting soft tissues. - Dystrophic calcification specifically refers to calcification occurring in damaged or necrotic tissue, which is not a hallmark of primary hyperparathyroidism. **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. 134-135. [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. 76-77.
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