General Pathology Practice Questions

Q: Cause of nephrocalcinosis in granulomatous diseases is?

Increased conversion to 1,25 OH. ***Increased absorption*** - Granulomatous diseases, like sarcoidosis, lead to increased **vitamin D** absorption, causing hypercalcemia and subsequently **nephrocalcinosis**. [4] - This mechanism results from the conversion of inactive vitamin D to its active form, increasing calcium mobilization from the gut. [3], [4] *Dystrophic calcification* - Refers to calcium deposition in **damaged tissues**, typically not related to the increased absorption of calcium in nephrocalcinosis. - It usually occurs in areas with preceding tissue necrosis, rather than the increased calcium absorption seen in granulomatous diseases. *Increased conversion to 1,25 OH* - Although **increased conversion** of vitamin D occurs, it is not the primary reason for nephrocalcinosis; rather, it's the secondary effect of **increased absorption** that leads to calcium overload. [3], [4] - The relationship is more about the resultant increased calcium levels causing kidney damage rather than a direct causative effect. *Mutation in calcium sensing receptor* - This mutation typically causes **primary hyperparathyroidism** or other calcium dysregulations, but it is unrelated to the mechanism of nephrocalcinosis in **granulomatous diseases**. [1], [2] - Granulomatous nephrocalcinosis is more about excess calcium due to absorption rather than receptor malfunctioning.

Q: Which of the following is a characteristic feature of Werner's syndrome?

Accelerated aging. ***Premature ageing*** - Werner's disease is characterized by **accelerated aging** and the appearance of age-related diseases at a much younger age [1]. - Patients often present with **sclerosis**, hair graying, and other features associated with advanced age [1]. *Multiple cancer* - While patients with Werner's may have **increased cancer risk**, it is not a direct hallmark of the disease. - The primary feature focuses on **premature aging** rather than a significant predisposition to multiple cancers [1]. *Intestinal polyps* - Intestinal polyps are not typically associated with Werner's disease but are more characteristic of conditions like **Familial adenomatous polyposis (FAP)**. - The main pathology of Werner's lies in the **genetic mechanisms** behind aging, not specifically in gastrointestinal manifestations [1]. *Lax joints* - Although some connective tissue disorders can present with lax joints, this is not a feature of Werner's disease. - Werner's disease primarily involves **age-related changes** rather than joint laxity or hypermobility [1].

Q: Caseous necrosis is typically associated with which of the following conditions?

Tuberculosis. ***Tuberculosis*** - **Caseous necrosis** is the hallmark of **tuberculosis**, often described as having a "cottage cheese-like" appearance [1]. - This type of necrosis is characteristic of the **granulomas** formed in bacterial infections, especially by *Mycobacterium tuberculosis* [1]. *Lymphogranuloma venereum* - This sexually transmitted infection, caused by *Chlamydia trachomatis* serovars L1, L2, or L3, leads to **suppurative necrosis** in lymph nodes, characterized by stellate abscesses. - The necrosis seen is typically **liquefactive** and purulent, not caseous. *Cytomegalovirus infection* - CMV infection can cause various histological changes, including **cytomegalic inclusions** and necrosis, but it is not typically associated with caseous necrosis. - The cellular changes and inflammation are distinct from those seen in granulomatous diseases with caseation. *Granulomatosis with polyangiitis* - This autoimmune vasculitis is characterized by **necrotizing granulomas** and **vasculitis**, primarily affecting the respiratory tract and kidneys. - While it involves necrosis within granulomas, it is described as **fibrinoid necrosis** of vessels and surrounding tissue, not the classic caseous necrosis of tuberculosis. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Infectious Diseases, pp. 383-384.

Q: Where are venous emboli most often lodged?

Lungs. ***Lungs*** - **Venous emboli** are primarily lodged in the **pulmonary arteries**, causing **pulmonary embolism** [1]. - This occurs due to **deep vein thrombosis (DVT)** where clots travel to the lungs via the venous system [1]. *Heart* - While the heart can be affected by emboli, it usually deals with **arterial embolism** stemming from **atrial fibrillation** or other cardiac conditions. - Venous emboli typically bypass the heart before reaching the lungs; they do not lodge here. *Intestines* - Emboli can affect the intestines but they usually arise from **arterial sources**, leading to **ischemic bowel**. - The intestines are generally not a common site for venous emboli to lodge. *Kidneys* - Kidney emboli often result from **arterial occlusion**, particularly in conditions like **renal artery stenosis**. - Venous emboli do not typically impact the kidneys, as they move toward the pulmonary circulation.

Q: Coagulative necrosis is due to which of the following?

Denaturation of protein. ***Denaturation of protein*** - Coagulative necrosis primarily results from the **denaturation of proteins** within cells, which leads to cell membrane stability loss [1]. - Commonly associated with **ischemia** or **hypoxia**, causing localized tissue damage while preserving the basic structure of the necrotic tissue [1]. *Infection* - Infection can lead to **other forms of necrosis** such as liquefactive necrosis, but **not coagulative necrosis** directly. - Typically involves microbial agents that induce inflammation, instead of mere protein denaturation. *Enzymatic digestion* - Enzymatic digestion is characteristic of **liquefactive necrosis** where **enzymes degrade cellular structures**, leading to a liquid mass. - This process is not relevant to coagulative necrosis, which is marked by solid tissue with preserved outlines. *None* - The statement "None" doesn't accurately reflect the mechanism of coagulative necrosis, which **specifically involves protein denaturation**. - This oes not acknowledge the pathogenic factors involved 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. 53-55.

Q: In which of the following locations can fat necrosis occur?

All of the options. ***All of the above*** - Fat necrosis can occur in various conditions involving fat tissue, including **omentum**, **retroperitoneal fat**, and **breast tissue**. - It typically arises due to **trauma**, **infarction**, or **inflammation** leading to necrosis of adipocytes in these areas [1]. *Omentum* - While fat necrosis can occur in the **omentum**, it does not account for the complete picture as it can occur in other sites as well. - Conditions like abdominal trauma can lead to omental necrosis, but **other areas also commonly exhibit fat necrosis**. *Retroperitoneal fat* - Fat necrosis can indeed be associated with **retroperitoneal fat**, particularly after trauma or surgery. - However, it is limited to this specific area and not an exhaustive answer, as fat necrosis is also recognized in the **breast and omentum**. *Breast* - Fat necrosis is **common in the breast**, often following surgery or **radiation** therapy; however, it is not exclusive to this area. - Given that fat necrosis occurs in multiple sites, stating only the breast does not encapsulate **all conditions** where fat necrosis is common. **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: Which one of the following stains is specific for amyloid?

Congo red. ***Congo red*** - Congo red is a **specific stain for amyloid** that exhibits a characteristic **apple-green birefringence** under polarized light [1]. - It is widely used in **histopathology** to confirm the diagnosis of amyloidosis by staining amyloid deposits [1]. *Periodic Acid schiff (PAS)* - While PAS stain reveals **glycogen** and is useful in identifying certain infections, it is **not specific** for amyloid. - It may also stain various other cellular components like **glucose** and can lead to false positives in different conditions. *Von - Kossa* - This stain is primarily used to detect **calcium deposits**, particularly in cases of **mineralization** in tissues. - It is not applicable to amyloid deposits and does not provide diagnostic information about amyloidosis. *Alzerian red* - Alzerian red cannot be found in literature as a recognized stain; likely a misspelling of a similar term. - It fails to serve any staining purpose related to amyloid or established histological diagnostics. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of the Immune System, pp. 264-269.

Q: Both hyperplasia and hypertrophy are found in?

Pregnancy uterus. ***Pregnancy uterus*** - During pregnancy, the uterus undergoes both **hyperplasia** (increase in smooth muscle cell number) and **hypertrophy** (increase in smooth muscle cell size) to accommodate the growing fetus. - **Estrogen and progesterone** stimulate both processes simultaneously, making this the classic example of combined cellular adaptation. *Cardiac muscle in cardiomegaly* - Cardiac muscle cells are **terminally differentiated** and cannot undergo hyperplasia, only **hypertrophy** occurs in response to increased workload. - The heart enlarges primarily through increase in **myocyte size** rather than number, making this purely hypertrophic adaptation. *Skeletal muscle in athlete* - Athletic training primarily causes **hypertrophy** (increase in muscle fiber size) through protein synthesis and myofibril accumulation. - **Hyperplasia** in skeletal muscle is controversial and minimal compared to hypertrophy, making this predominantly a hypertrophic process. *Breast development in puberty* - Involves primarily **hyperplasia** of ductal epithelium and stromal tissue proliferation, along with **fat deposition**. - True cellular **hypertrophy** is not a significant component, unlike the uterine smooth muscle which both multiplies and enlarges.

Q: Barr bodies are seen in which of the following conditions?

Klinefelter's syndrome. ***Klinefelter's syndrome*** - Individuals with **Klinefelter's syndrome** have a **47, XXY karyotype**, meaning they have two X chromosomes. - One of these X chromosomes undergoes **X-inactivation** to form a Barr body, which is a condensed, inactive X chromosome [1]. *Turners syndrome* - Individuals with **Turner's syndrome** typically have a **45, XO karyotype**, meaning they have only one X chromosome [1]. - Since they lack a second X chromosome, they do not form a **Barr body**. *Testicular feminization syndrome* - Individuals with **testicular feminization syndrome** (now known as **Androgen Insensitivity Syndrome**) have a **46, XY karyotype**. - As they have only one X chromosome, they do not form a **Barr body**. *46 XY* - A **46, XY karyotype** represents a typical male, meaning they have one X and one Y chromosome. - Since they have only one X chromosome, they do not form a **Barr body**. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Genetic Disorders, pp. 173-174.

Q: Caspases are involved in:

Programmed cell death (apoptosis). ***Apoptosis*** - Caspases are **proteolytic enzymes** that play a crucial role in executing apoptosis, which is a programmed cell death process [1]. - They are activated in a cascade leading to the **cleavage of various cellular substrates**, facilitating the orderly dismantling of the cell [1]. *Cell signaling* - While caspases can influence **cell signaling pathways**, their primary function is not in this signaling but rather in executing cell death. - Cell signaling involves various other molecules like **kinases and phosphatases** that mediate communication in cells. *Pinocytosis* - Pinocytosis is a **form of endocytosis**, primarily involving the ingestion of liquids and small molecules by cells, which does not involve caspases. - This process is more aligned with membrane dynamics and is distinct from the programmed cell death features of caspases. *Cell injury* - Although cell injury can trigger apoptotic pathways [2], caspases are specifically involved in the **execution of apoptosis**, not in the injury itself. - Cell injury encompasses a broader range of processes including necrosis, which is very different from apoptosis. **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. 63-67. [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. 80-81.

Question 1

Cause of nephrocalcinosis in granulomatous diseases is?

Accepted Answer

Increased conversion to 1,25 OH

Answer

Dystrophic calcification

Answer

Mutation in calcium sensing receptor

Answer

Increased absorption

Question 2

Which of the following is a characteristic feature of Werner's syndrome?

Accepted Answer

Accelerated aging

Answer

Joint laxity

Answer

Multiple cancers

Answer

Intestinal polyps

Question 3

Caseous necrosis is typically associated with which of the following conditions?

Accepted Answer

Tuberculosis

Answer

Lymphogranuloma venereum

Answer

Cytomegalovirus infection

Answer

Granulomatosis with polyangiitis

Question 4

Where are venous emboli most often lodged?

Accepted Answer

Lungs

Answer

Kidneys

Answer

Intestinal veins

Answer

Coronary arteries

Question 5

Coagulative necrosis is due to which of the following?

Accepted Answer

Denaturation of protein

Answer

Enzymatic digestion

Answer

Infection

Answer

Increased enzymatic activity

Question 6

In which of the following locations can fat necrosis occur?

Accepted Answer

All of the options

Answer

Omental fat

Answer

Breast tissue

Answer

Retroperitoneal fat

Question 7

Which one of the following stains is specific for amyloid?

Accepted Answer

Congo red

Answer

Von - Kossa

Answer

Alizarin red

Answer

Periodic Acid Schiff (PAS)

Question 8

Both hyperplasia and hypertrophy are found in?

Accepted Answer

Pregnancy uterus

Answer

Cardiac muscle in cardiomegaly

Answer

Skeletal muscle in athlete

Answer

Breast development in puberty

Question 9

Barr bodies are seen in which of the following conditions?

Accepted Answer

Klinefelter's syndrome

Answer

46 XY

Answer

Testicular feminization syndrome

Answer

Turner's syndrome

Question 10

Caspases are involved in:

Accepted Answer

Programmed cell death (apoptosis)

Answer

Processes leading to cellular damage

Answer

Fluid absorption

Answer

Cell signaling

General Pathology — MCQs

General Pathology — MCQs

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