General Pathology Practice Questions

Q: Lardaceous spleen is a feature of:

Amyloidosis. ***Amyloidosis*** - The presence of a **lardaceous spleen** is characteristic of amyloidosis, where **amyloid deposits** infiltrate the spleen leading to enlargement [1][2]. - This condition often results in **firm, waxy appearance** of the spleen on examination [1]. *Thalassemia* - Thalassemia can cause **splenomegaly**, but the spleen typically does not present with a **lardaceous** appearance. - It is associated primarily with **hemolytic anemia** and characteristic changes in blood tests. *Malaria* - In malaria, the spleen can become **enlarged** due to immune response, but not lardaceous. - The splenic enlargement in malaria is usually **soft** and associated with fever and other symptoms of infection. *Sickle cell anemia* - Sickle cell anemia features **splenic atrophy** or dysfunction over time, not a lardaceous spleen. - It causes **recurrent vaso-occlusive crises** and other complications, but does not lead to characteristic amyloid deposition. **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] 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 a type of programmed cell death?

All of the above. ***All of the above*** - **Apoptosis**, **pyroptosis**, and **necroptosis** are all recognized forms of **programmed cell death** in current medical literature. - Each represents a distinct, **regulated mechanism** of cell death with specific molecular pathways and physiological functions. *Apoptosis* - This is the classic form of **programmed cell death**, characterized by **cell shrinkage**, chromatin condensation, and formation of apoptotic bodies. - Essential for **tissue homeostasis**, development, and removal of damaged cells without triggering inflammation. *Pyroptosis* - A **regulated form of programmed cell death** mediated by **inflammasome activation** and characterized by cell swelling and membrane rupture. - Functions as an **innate immune response** to eliminate infected cells and release inflammatory signals to recruit immune cells. *Necroptosis* - A **regulated form of programmed cell death** that occurs when apoptosis is inhibited, serving as a backup cell death mechanism. - Characterized by **cell swelling** and membrane permeabilization, triggered by specific signaling pathways involving **RIPK1** and **RIPK3** kinases.

Q: Histologic sections of lung tissue from a 66-year-old woman with congestive heart failure and progressive breathing problems reveal numerous hemosiderin-laden cells within the alveoli. Which of the following is the cell of origin of these "heart failure cells"?

Macrophages. ***Macrophages*** - "Heart failure cells" are hemosiderin-laden **alveolar macrophages** that ingest red blood cells due to pulmonary hemorrhage from congestive heart failure [1]. - They are a hallmark of **lung congestion** and indicate chronic pulmonary edema related to heart failure. *Pneumocytes* - Pneumocytes are **alveolar epithelial cells** responsible for gas exchange and surfactant production, not for the accumulation of hemosiderin. - They do not play a significant role in responding to **hemorrhage** in the alveolar space. *Endothelial cells* - Endothelial cells line the blood vessels but do not become hemosiderin-laden cells; they do not function in the **phagocytosis** of extravasated red blood cells. - They are involved in maintaining **vascular integrity** and are not the source of "heart failure cells." *Lymphocytes* - Lymphocytes are **immune cells** primarily involved in the adaptive immune response and do not accumulate hemosiderin in response to heart failure. - They are not involved in the **phagocytosis** process of red blood cells in the alveoli. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Lung, pp. 702-703.

Q: Which of the following is an intermediate filament found in epithelial cells?

Cytokeratin. ***Cytokeratin*** - **Cytokeratins** are the characteristic intermediate filaments of **epithelial cells** [1]. - They provide structural integrity and mechanical support to epithelial tissues and are used as markers in **histopathology** to identify epithelial cell origin [1]. *Neurofilaments* - **Neurofilaments** are specific to **neurons**, providing structural support for axons. - They are primarily found in the cytoplasm of nerve cells, not epithelial tissue. *Desmin (muscle filament)* - **Desmin** is the intermediate filament found predominantly in **muscle cells** (skeletal, cardiac, and smooth muscle). - It links the sarcolemma to the contractile apparatus, not present in epithelial cells. *Vimentin (mesenchymal filament)* - **Vimentin** is typically found in cells of **mesenchymal origin**, such as fibroblasts, endothelial cells, and lymphocytes. - It is used as a marker for cells that have undergone **epithelial-to-mesenchymal transition (EMT)** but is not characteristic of mature epithelial cells. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. With Illustrations By, pp. 22-23.

Q: Among the following anatomical locations, where does fat necrosis most commonly occur?

Pancreatic tissue. ***Omentum*** - Fat necrosis is most commonly associated with the **omentum**, especially following abdominal trauma or pancreatitis. - It is characterized by the release of **lipases**, leading to the breakdown of triglycerides and the production of necrotic fat tissue [1]. *Kidney* - Fat necrosis does not typically occur in the kidney; rather, it is more commonly associated with processes affecting the abdominal cavity. - Kidney pathology more commonly involves conditions like **glomerulonephritis** or **nephrosclerosis**, not fat necrosis. *Heart* - While the heart can undergo necrosis due to ischemia, it does not develop fat necrosis, which is characteristically associated with extra-abdominal fat. - Heart tissue is more prone to **myocardial infarction** resulting from **coronary artery disease**. *Brain* - Brain tissue primarily undergoes *infarction* or **necrosis** due to vascular insults, not fat necrosis. - Pathological changes in the brain include **cerebral edema** and gliosis, rather than fat 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.

Q: What is the definitive method for identifying amyloid deposits?

Congo red staining with polarized light microscopy. ***Green birefringence of stained amyloid when viewed by polarizing microscope*** - When stained with **Congo red**, amyloid exhibits **green birefringence** when viewed under polarized light, which is a hallmark for its identification [1]. - This characteristic is crucial for confirming the presence of amyloid deposits in tissues during histopathological examination [1]. *Secondary fluorescence in UV light with riboflavin* - This method is not a recognized technique for identifying amyloid, as it primarily deals with **fluorescent properties** not linked to amyloid detection. - **Riboflavin** itself is not associated with amyloid identification and does not indicate its presence in tissues. *Congo red* - While **Congo red** is a staining method for detecting amyloid, it needs to be combined with a polarizing microscope to visualize the characteristic **birefringence** [1]. - Simply using Congo red does not provide the definitive identification without considering its polarization properties [1]. *Staining with methyl violet* - **Methyl violet** is used for various histological stains but does not specifically identify amyloid deposits. - This method lacks the specificity needed for detecting amyloid, making it unsuitable compared to other recognized techniques. **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.

Q: Which stain is used to identify heart failure cells?

Prussian blue. ***Prussian blue*** - **Heart failure cells** are actually **siderophages**, which are macrophages that have phagocytosed red blood cells and subsequently processed the hemoglobin into **hemosiderin**. - **Prussian blue stain** reacts with the iron in hemosiderin, turning it blue, thereby identifying these cells in the sputum or lung tissue of patients with **pulmonary edema secondary to heart failure**. *Alcian blue* - This stain is used to detect **acidic mucopolysaccharides** and **acidic glycoproteins**, typically seen in conditions involving abnormal mucin production or accumulation. - It does not specifically stain or identify **iron deposits** or **siderophages** associated with heart failure. *Silver stains* - **Silver stains** (e.g., Gomori methenamine silver) are primarily used to highlight **fungi**, **basement membranes** in kidney tissue, and **reticulin fibers**. - They are not employed for the identification of **iron-laden macrophages** or **heart failure cells**. *PAS* - The **Periodic Acid-Schiff (PAS) stain** is used to detect **glycogen**, **mucins**, and **glycoproteins**, staining them magenta. - It is often utilized in diagnosing conditions like **Whipple's disease**, **glycogen storage diseases**, or kidney diseases with **thickened basement membranes**, but not for iron detection.

Q: Which of the following is known as wear and tear pigment?

Lipochrome. ***Lipochrome*** - Known as **wear and tear pigment**, lipochrome accumulates in tissues with age and is linked to oxidative stress [1]. - It is associated with aging and is found in various organs, indicating **cellular damage over time** [1]. *Cytochrome* - Cytochromes are **heme-containing proteins** involved in electron transport and metabolism, not specifically associated with aging pigment. - They play a crucial role in **cellular respiration** but do not accumulate as a result of "wear and tear." *Lipoprotein* - Lipoproteins are complexes of **lipids and proteins** that transport lipids in the blood, not related to the concept of wear and tear pigment. - Their primary function is in **lipid metabolism and transport**, rather than indicating aging or cellular damage. *Lipoxin* - Lipoxins are signaling molecules involved in the resolution of inflammation, not associated with aging or wear and tear. - They play a role in **immune response** rather than serving as a pigment of age-related cellular degradation. **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. 75.

Question 1

Lardaceous spleen is a feature of:

Accepted Answer

Amyloidosis

Answer

Thalassemia

Answer

Sickle cell anemia

Answer

Malaria

Question 2

Which of the following is an example of metastatic calcification?

Accepted Answer

Primary hyperparathyroidism

Answer

Rheumatic heart disease

Answer

Monckeberg's medial calcific sclerosis

Answer

Psammoma bodies

Question 3

A 25-year-old man complains of myopathy and undergoes a muscle biopsy for diagnosis. Histopathology demonstrates an inflammatory muscle disease characterized by non-caseating granulomas. Which of the following conditions is most likely to have caused his symptoms?

Accepted Answer

Sarcoidosis

Answer

Cysticercosis

Answer

Tuberculosis

Answer

Schistosomiasis

Question 4

Which of the following is a type of programmed cell death?

Accepted Answer

All of the above

Answer

Apoptosis

Answer

Pyroptosis

Answer

Necroptosis

Question 5

Histologic sections of lung tissue from a 66-year-old woman with congestive heart failure and progressive breathing problems reveal numerous hemosiderin-laden cells within the alveoli. Which of the following is the cell of origin of these "heart failure cells"?

Accepted Answer

Macrophages

Answer

Endothelial cells

Answer

Lymphocytes

Answer

Pneumocytes

Question 6

Which of the following is an intermediate filament found in epithelial cells?

Accepted Answer

Cytokeratin

Answer

Neurofilaments

Answer

Desmin (muscle filament)

Answer

Vimentin (mesenchymal filament)

Question 7

Among the following anatomical locations, where does fat necrosis most commonly occur?

Accepted Answer

Pancreatic tissue

Answer

Cerebral tissue

Answer

Myocardial tissue

Answer

Renal tissue

Question 8

What is the definitive method for identifying amyloid deposits?

Accepted Answer

Congo red staining with polarized light microscopy

Answer

Thioflavin T fluorescence microscopy

Answer

Methyl violet staining

Answer

Riboflavin fluorescence under UV light

Question 9

Which stain is used to identify heart failure cells?

Accepted Answer

Prussian blue

Answer

Alcian blue

Answer

Silver stains

Answer

PAS

Question 10

Which of the following is known as wear and tear pigment?

Accepted Answer

Lipochrome

Answer

Cytochrome

Answer

Lipoxin

Answer

Lipoprotein

General Pathology — MCQs

General Pathology — MCQs

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