Granulomatous Inflammation — MCQs
A 45-year old patient presented with fever, night sweats and weight loss. On X-ray, a mass was seen in apical lobe. On histopathology, caseous necrosis was present. What is the name of underlying process?
Which of the following is characteristically associated with sarcoidosis?
Granuloma is a pathological feature of all, except which of the following?
Which is NOT a feature of chronic inflammation?
The principal cell in a granuloma is
What is the primary reason for the development of granuloma formation in tertiary syphilis?
The image shows a histological section of intestinal tissue with a granuloma. What is the most likely diagnosis?
Which of the following does not cause granulomatous inflammation?
Which statement about macrophages is incorrect?
Most important for diapedesis is
Granulomatous Inflammation Indian Medical PG Practice Questions and MCQs
Question 1: A 45-year old patient presented with fever, night sweats and weight loss. On X-ray, a mass was seen in apical lobe. On histopathology, caseous necrosis was present. What is the name of underlying process?
- A. Decreased supply of growth factor
- B. Acute decrease in blood supply
- C. Enzymatic degeneration
- D. Granulomatous inflammation (Type IV hypersensitivity) (Correct Answer)
Explanation: ***Granulomatous inflammation (Type IV hypersensitivity)*** - The presence of **caseous necrosis** on histopathology, combined with symptoms like fever, night sweats, and weight loss, and an apical lung mass, is highly characteristic of **tuberculosis** [1]. - Tuberculosis is a classic example of a **type IV hypersensitivity reaction** involving **epithelioid macrophages** (modified macrophages), **lymphocytes**, and **Langhans giant cells** forming **granulomas** with central **caseous necrosis** [2], [3]. - This represents **granulomatous inflammation**, which is the hallmark histopathological finding in tuberculosis [1]. *Decreased supply of growth factor* - This typically leads to **atrophy** or **apoptosis**, which are distinct from the inflammatory and necrotic process described. - It does not explain the characteristic histological finding of **caseous necrosis** or the systemic symptoms. *Acute decrease in blood supply* - An acute decrease in blood supply (ischemia or infarction) would lead to **coagulative necrosis** in most tissues, not the **caseous necrosis** seen in this presentation. - While infarction can cause tissue death, the specific histological and clinical picture points away from simple ischemia. *Enzymatic degeneration* - **Enzymatic degeneration**, particularly from pancreatic enzymes, is typical of **fat necrosis** (e.g., in acute pancreatitis), where fat cells are broken down. - This process does not produce the characteristic **caseous necrosis** and granulomatous inflammation seen in the patient's lung. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Infectious Diseases, pp. 383-384. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Inflammation and Repair, p. 109. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Infectious Diseases, p. 360.
Question 2: Which of the following is characteristically associated with sarcoidosis?
- A. Asteroid bodies
- B. Granulomatous inflammation
- C. Schaumann bodies
- D. Non-caseating granulomas (Correct Answer)
Explanation: ***Grossly bullous appearance*** - This feature is **not typically seen** in sarcoidosis; instead, sarcoidosis usually presents with various tissue infiltrations [1]. - Characteristically, sarcoidosis features **granulomas**, not a bullous skin manifestation [1]. *Asteroid bodies* - Asteroid bodies are **star-shaped inclusions** found within the non-caseating granulomas seen in sarcoidosis. - Their presence supports the diagnosis, indicating **typical histological findings** of the disease. *Non caseating granulomas* - Sarcoidosis is definitively characterized by the presence of **non-caseating granulomas**, which are key diagnostic features [1]. - These granulomas differentiate sarcoidosis from other granulomatous diseases, like tuberculosis [2]. *Schaumann bodies* - Schaumann bodies are **calcium-laden** structures found within the granulomas in sarcoidosis, further supporting the diagnosis. - The presence of these bodies alongside non-caseating granulomas is a classic histopathological finding in sarcoidosis. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Lung, pp. 700-701. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Inflammation and Repair, p. 109.
Question 3: Granuloma is a pathological feature of all, except which of the following?
- A. Giant cell arteritis
- B. Granulomatosis with polyangiitis
- C. Eosinophilic granulomatosis with polyangiitis
- D. Microscopic polyangiitis (Correct Answer)
Explanation: ***Microscopic polyangitis*** - This condition is associated with **necrotizing vasculitis** without significant **granulomatous inflammation** [1]. - Primarily affects small vessels and typically features **pauci-immune** glomerulonephritis [1]. *Giant cell arteritis* - Characterized by **granulomatous inflammation** in the temporal arteries, leading to headaches and vision loss [2]. - It often shows **multinucleated giant cells** in biopsy specimens, confirming the diagnosis [2]. *Churg strauss disease* - Also known as **Eosinophilic Granulomatosis with Polyangiitis**, it features **granulomas** and affects small to medium vessels. - Typically presents with asthma, nasal polyps, and significant **eosinophilia**. *Wegner's granulomatosis* - Now referred to as **Granulomatosis with Polyangiitis**, it prominently features **necrotizing granulomas** in the respiratory tract and kidneys [3]. - Associated with **c-ANCA** (anti-neutrophil cytoplasmic antibodies), confirming its granulomatous nature [3]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of Infancy and Childhood, pp. 518-519. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of Infancy and Childhood, pp. 516-517. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of Infancy and Childhood, pp. 519-520.
Question 4: Which is NOT a feature of chronic inflammation?
- A. Mononuclear cells
- B. Neutrophil predominance (Correct Answer)
- C. Fibrosis
- D. Granulation tissue
Explanation: ***Neutrophil predominance*** - **Neutrophil predominance** is characteristic of **acute inflammation**, where these cells are among the first responders to injury or infection [1]. - In chronic inflammation, neutrophils are typically present in much smaller numbers compared to mononuclear cells, or their presence indicates an acute exacerbation [3]. *Mononuclear cells* - **Mononuclear cells**, such as **macrophages**, **lymphocytes**, and **plasma cells**, are the hallmark cellular infiltrates of chronic inflammation [1]. - These cells are responsible for sustained immune responses, tissue destruction, and repair processes [2]. *Fibrosis* - **Fibrosis**, or the deposition of **collagen** by fibroblasts, is a common outcome of chronic inflammation as the body attempts to repair ongoing tissue damage [3]. - It leads to **scarring** and functional impairment of affected organs [4]. *Granulation tissue* - **Granulation tissue** is an early phase of **tissue repair** during chronic inflammation, characterized by the proliferation of **fibroblasts** and new **blood vessels (angiogenesis)** [5]. - It represents the body's effort to fill tissue defects and prepare for eventual fibrous scar formation [5]. **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. 195-196. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Inflammation and Repair, pp. 107-109. [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. 196-197. [4] 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. 200-202. [5] 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. 194-195.
Question 5: The principal cell in a granuloma is
- A. Lymphocyte
- B. Histiocyte (Correct Answer)
- C. Giant cell
- D. Langerhans
Explanation: ***Histiocyte*** - Histiocytes are the principal **macrophages** in a granuloma, playing a key role in the **immune response** [1][2]. - They are responsible for phagocytosis and the formation of **epithelioid cells**, which are typical of granulomatous inflammation [1]. *Giant cell* - While giant cells are present in granulomas, they are formed from the **fusion of macrophages** and are not the principal cell type [1]. - Their presence signifies a chronic inflammatory response but does not define the granuloma itself. *Langhans* - Langhans giant cells are a specific type of giant cell that may be found in granulomas, particularly in conditions like **tuberculosis** [1]. - They are characterized by a **multi-nucleated** appearance but are not the principal cell in granuloma formation [1]. *Lymphocyte* - Lymphocytes are part of the **adaptive immune response** and may be present in granulomas, but they are not the main cell type [1][3]. - Their role is more of a supportive function, typically acting later in the inflammatory response rather than in granuloma formation. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Inflammation and Repair, p. 109. [2] 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. 198-200. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Infectious Diseases, pp. 360-362.
Question 6: What is the primary reason for the development of granuloma formation in tertiary syphilis?
- A. Secondary bacterial infection of syphilitic lesions
- B. Delayed hypersensitivity reaction to treponemal antigens (Correct Answer)
- C. Direct tissue invasion by spirochetes
- D. Vasculitis leading to tissue ischemia
Explanation: ***Delayed hypersensitivity reaction to treponemal antigens*** - **Granuloma formation** in tertiary syphilis (gummas) is primarily an immune-mediated response [1]. - It represents a **Type IV delayed hypersensitivity reaction** to persistent **treponemal antigens**, leading to chronic inflammation and tissue destruction [2]. *Secondary bacterial infection of syphilitic lesions* - While secondary infections can occur in various skin lesions, they are **not the primary mechanism** for granuloma formation in tertiary syphilis. - Granulomas are a specific inflammatory response to the *Treponema pallidum* organism itself, not secondary bacterial pathogens. *Direct tissue invasion by spirochetes* - Although *Treponema pallidum* directly invades tissues during all stages of syphilis, the **sheer presence of spirochetes** is not the sole cause of the granulomatous reaction in tertiary syphilis [3]. - The few spirochetes present in tertiary lesions are insufficient to directly cause such extensive lesions; rather, the host's immune response to these persistent organisms is crucial. *Vasculitis leading to tissue ischemia* - **Obliterative endarteritis** (vasculitis of small vessels) is a common pathological feature of syphilis, contributing to tissue damage and necrosis. - However, it is an **associated pathological process**, not the primary immune mechanism driving the characteristic granuloma formation itself. **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. 173-174. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of the Immune System, p. 218. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Infectious Diseases, pp. 385-386.
Question 7: The image shows a histological section of intestinal tissue with a granuloma. What is the most likely diagnosis?
- A. TB
- B. Crohn's (Correct Answer)
- C. Cat scratch disease
- D. Syphilis
Explanation: ***Crohn's*** - Crohn's disease is characterized by **non-caseating granulomas** in the intestinal wall, which are a key diagnostic feature [1][3]. - These granulomas are typically **non-necrotizing** and can be found in any part of the gastrointestinal tract from mouth to anus [1][2]. *TB* - Tuberculosis (TB) typically forms **caseating granulomas** with central necrosis, which is distinct from the non-caseating granulomas of Crohn's. - TB granulomas often contain **Langhans giant cells** [4] and are associated with a specific infectious etiology. *Cat scratch disease* - Cat scratch disease, caused by *Bartonella henselae*, presents with **stellate or suppurative granulomas** in lymph nodes. - These granulomas are characterized by a central area of **necrosis and neutrophils**, surrounded by epithelioid cells, differing from Crohn's. *Syphilis* - Syphilis, particularly in its tertiary stage, can form **gummas**, which are granulomatous lesions. - Gummas are characterized by **coagulative necrosis** and a chronic inflammatory infiltrate, but they are not typically found in the intestinal wall as a primary feature like in Crohn's. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, pp. 806-807. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Alimentary System Disease, pp. 365-366. [3] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Alimentary System Disease, pp. 366-367. [4] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Inflammation and Repair, p. 109.
Question 8: Which of the following does not cause granulomatous inflammation?
- A. Sarcoidosis
- B. Tuberculosis
- C. Pneumonia (Correct Answer)
- D. Histoplasmosis
Explanation: ***Pneumonia*** - **Pneumonia**, in its typical bacterial form, usually causes an **acute inflammatory response** with neutrophil infiltration in the alveoli [1], [2]. - While some atypical pneumonias can have chronic or granulomatous features, the term "pneumonia" alone generally refers to acute inflammation without granulomas. *Sarcoidosis* - **Sarcoidosis** is characterized by distinctive **non-caseating granulomas** in multiple organs, most commonly the lungs, lymph nodes, and skin [3], [4]. - The formation of these granulomas is a hallmark of the disease and is crucial for diagnosis [3]. *Tuberculosis* - **Tuberculosis** is classically characterized by the formation of **caseating granulomas** (tubercles) with central necrosis, surrounded by epithelioid macrophages and giant cells [2]. - The host immune response to *Mycobacterium tuberculosis* is primarily granulomatous, aiming to contain the infection. *Histoplasmosis* - **Histoplasmosis**, a fungal infection caused by *Histoplasma capsulatum*, often leads to the formation of **granulomas**, both caseating and non-caseating [2]. - The granulomatous response is an essential part of the host's defense mechanism against this intracellular pathogen. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Respiratory Tract Disease, pp. 317-318. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Infectious Diseases, p. 360. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Lung, pp. 700-701. [4] 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. 198-200.
Question 9: Which statement about macrophages is incorrect?
- A. Phagocytic cells
- B. M2 type involved in inflammation (Correct Answer)
- C. Activation by IFN-γ
- D. Major cells in chronic inflammation
Explanation: ***M2 type involved in inflammation*** - The M2 macrophages are primarily associated with **anti-inflammatory responses** and tissue repair, not inflammation [1][2]. - They play a role in **wound healing** and **resolution of inflammation**, contrasting with the inflammatory role attributed in the statement [2][3]. *Phagocytic cells* - **Macrophages are indeed phagocytic**, meaning they ingest and eliminate pathogens and debris [1]. - This is a fundamental characteristic of macrophages, playing a crucial role in the **immune response**. *Activation by IFN-y* - **Interferon-gamma (IFN-y)** is known to activate macrophages, particularly enhancing their ability to kill intracellular pathogens [1][2]. - This activation is vital for macrophage's role in **cell-mediated immunity** [1]. *Major cells in chronic inflammation* - Macrophages are significant players in **chronic inflammation**, contributing to tissue remodeling and the persistent inflammatory state [1]. - They secrete various cytokines that maintain the pathological state seen in chronic inflammatory diseases. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Inflammation and Repair, pp. 105-106. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Inflammation and Repair, pp. 106-107. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Inflammation and Repair, p. 115.
Question 10: Most important for diapedesis is
- A. PECAM (Correct Answer)
- B. Selectins
- C. Mucin like glycoprotein
- D. Integrins
Explanation: ***Platelet Endothelial Cell Adhesion Molecule (PECAM)*** - PECAM plays a crucial role in the process of **diapedesis**, allowing white blood cells to pass through the endothelial barrier [1]. - It is specifically involved in **intercellular junctions**, facilitating the migration of leukocytes during **inflammation** [1]. *Selectins* - Selectins are important for **rolling** of leukocytes on the endothelium but do not directly mediate **diapedesis**. - They are crucial for initial attachment but do not promote the passage through the endothelial cell junctions. *Mucin like glycoprotein* - While mucin like glycoproteins can facilitate **cell adhesion**, they primarily contribute to the **rolling phase** rather than diapedesis itself. - They are not as directly involved in the **transmigration** across the endothelium as PECAM. *Integrins* - Integrins are involved in **firm adhesion** of leukocytes, but do not directly enable **diapedesis** across the endothelium. - They support the binding to the endothelium but play a lesser role compared to PECAM in the actual process of migration. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Inflammation and Repair, pp. 87-89.
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