General Pathology Practice Questions

Q: 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?

Sarcoidosis. ***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.

Q: Which condition is associated with 'apple-green birefringence' under polarized light when stained with Congo red?

Amyloidosis. ***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.

Q: Which of the following is considered the prototype anti-apoptotic gene?

Bcl-2. ***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.

Q: Vitamin A deficiency leads to metaplasia of which type of epithelium?

Columnar epithelium. ***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.

Q: What is the characteristic feature of thermal injury in tissues?

Coagulation necrosis of tissue proteins. ***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.

Q: Which stain is used for staining the nucleus?

Hematoxylin. ***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.

Q: Blebs are associated with which type of cell injury?

Both. ***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 1

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?

Accepted Answer

Sarcoidosis

Answer

Tuberculosis

Answer

Wegener granulomatosis

Answer

Pneumoconiosis

Question 2

Which feature of a burn injury is most important in determining whether it was caused by a chemical or thermal source?

Accepted Answer

Pattern of injury (e.g., splash marks, scalding patterns)

Answer

Type of tissue damage

Answer

Depth of burn (e.g., superficial, partial thickness, full thickness)

Answer

Presence of blisters (e.g., size, number, and characteristics of blisters)

Question 3

Which condition is associated with 'apple-green birefringence' under polarized light when stained with Congo red?

Accepted Answer

Amyloidosis

Answer

Rheumatoid arthritis

Answer

Systemic lupus erythematosus

Answer

Scleroderma

Question 4

Which of the following is considered the prototype anti-apoptotic gene?

Accepted Answer

Bcl-2

Answer

Bcl-xL

Answer

Bax

Answer

Mcl-1

Question 5

Vitamin A deficiency leads to metaplasia of which type of epithelium?

Accepted Answer

Columnar epithelium

Answer

None of the options

Answer

Cuboidal epithelium

Answer

Squamous epithelium

Question 6

What is the characteristic feature of thermal injury in tissues?

Accepted Answer

Coagulation necrosis of tissue proteins

Answer

Ruptured blood vessels or clotted blood

Answer

Irregular margins due to thermal damage

Answer

Smooth tissue margins due to healing

Question 7

Which stain is used for staining the nucleus?

Accepted Answer

Hematoxylin

Answer

Safranin

Answer

Fast green

Answer

Erythrosine

Question 8

Blebs are associated with which type of cell injury?

Accepted Answer

Both

Answer

Reversible

Answer

Irreversible

Answer

None of the options

Question 9

Which of the following conditions is the best example of both physiological hyperplasia and hypertrophy?

Accepted Answer

Uterus during pregnancy

Answer

None of the options

Answer

Skeletal muscle in athletes

Answer

Breast tissue at puberty

Question 10

Dystrophic calcification is associated with which of the following conditions?

Accepted Answer

Atheromatous plaques and other conditions.

Answer

Milk alkali syndrome

Answer

Hyperparathyroidism

Answer

Vitamin A intoxication

General Pathology — MCQs

General Pathology — MCQs

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