General Pathology Practice Questions

Q: Microscopically, epimyoepithelial islands are typically seen in:

Sjögren's syndrome. ***Sjögren's syndrome*** - **Epimyoepithelial islands** are a characteristic histopathological feature of **Sjögren's syndrome**, particularly in affected salivary glands. [1] - These islands represent **benign lymphoepithelial lesions** where ducts are surrounded by lymphocytes, eventually forming true islands. *Epithelial-myoepithelial carcinoma* - This is a **malignant salivary gland tumor** with dual differentiation, but it typically presents as distinct inner epithelial and outer myoepithelial layers around ducts or cords, not as true "islands." - While it involves both epithelial and myoepithelial cells, its arrangement and neoplastic nature differ from the benign epimyoepithelial islands of Sjögren's. *Myoepithelioma* - This is a **benign tumor composed predominantly of myoepithelial cells**, often appearing in various morphological patterns (spindle, plasmacytoid, epithelioid, clear cell). - It does not typically form the well-defined **lymphoepithelial islands** seen in Sjögren's, as its characteristic is the proliferation of myoepithelial cells in a different architectural pattern. *Mucoepidermoid carcinoma* - This is a common **malignant salivary gland tumor** characterized by a mixture of mucin-producing cells, epidermoid cells, and intermediate cells. - Its histological features are distinct and do not include the formation of **epimyoepithelial islands**, which are diagnostically specific to Sjögren's syndrome. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of the Immune System, pp. 235-236.

Q: In a patient with gouty arthritis, synovial fluid aspiration will show:

Monosodium Urate crystals. ***Monosodium Urate crystals*** - The definitive diagnosis of **gouty arthritis** is made by identifying **needle-shaped, negatively birefringent monosodium urate crystals** in the synovial fluid [1]. - These crystals are formed from **elevated uric acid levels** and precipitate in joints, triggering acute inflammation [2]. *Calcium Pyrophosphate crystals* - These crystals are characteristic of **pseudogout**, or **calcium pyrophosphate deposition disease (CPPD)**, and are typically **rhomboid-shaped and positively birefringent** [3]. - While both gout and pseudogout cause acute arthritis, the **crystal morphology and birefringence** differentiate them [3]. *Mononuclear Leucocytosis* - **Mononuclear leucocytosis** in synovial fluid is more commonly seen in **chronic inflammatory conditions** or some **viral arthritides**, not typically in acute gout attacks. - Acute gout is characterized by a strong **neutrophilic inflammatory response** [1]. *Polymorphonuclear Leukocytosis* - While **polymorphonuclear leukocytosis** (predominantly neutrophils) is indeed seen in the synovial fluid of patients with acute gout due to the intense inflammatory response, it is a **non-specific finding** of inflammation [1]. - It does not definitively diagnose gout, as it can be present in other inflammatory arthritides, including **septic arthritis**, making the **crystal identification crucial**. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Bones, Joints, and Soft Tissue Tumors, pp. 1218-1220. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Osteoarticular And Connective Tissue Disease, pp. 682-683. [3] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Osteoarticular And Connective Tissue Disease, pp. 683-684.

Q: Radiation mediates its effect by

Ionization of the molecules. ***Ionization of the molecules*** - Radiation, particularly **ionizing radiation**, interacts with biological molecules by ejecting electrons, leading to the formation of highly reactive **ions and free radicals** [1]. - This **ionization** process is the primary mechanism by which radiation damages cellular components, including **DNA** [2]. *Protein coagulation* - While radiation can cause protein damage, **coagulation** is not its primary or direct mechanism, especially at clinically relevant doses. - Protein coagulation is more typically associated with **heat** or certain strong chemical agents. *Osmolysis of cells* - **Osmolysis** refers to the rupture of cells due to excessive water influx, often caused by changes in osmotic pressure. - Radiation does not directly induce **osmotic imbalances** leading to cell lysis. *Denaturation of DNA* - While radiation ultimately leads to **DNA damage**, denaturation (unfolding) is a specific type of damage, often caused by heat or extreme pH. - The direct effect of radiation is **ionization**, which then indirectly causes various forms of DNA damage including breaks, cross-links, and base modifications, but not solely "denaturation" [1]. **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. 101-102. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Central Nervous System Synapse, pp. 436-437.

Q: Who is the founder of the electron microscope?

Ernst Ruska. ***Ernst Ruska*** - **Ernst Ruska**, along with Max Knoll, is credited with the invention of the **electron microscope** in 1931. - His work on electron optics eventually led to the development of the **transmission electron microscope (TEM)**, which revolutionized scientific research. *Robert Koch* - **Robert Koch** was a German physician and microbiologist who is one of the founders of **modern bacteriology**. - He is famous for identifying the specific causative agents of infectious diseases such as **tuberculosis, cholera, and anthrax**, and for developing methods for culturing bacteria. *Antonie Philips van Leeuwenhoek* - **Antonie van Leeuwenhoek** is known as the **"Father of Microbiology"** due to his pioneering work in microscopy. - He was the first to observe and describe **single-celled organisms** (which he called "animalcules") and microscopic structures such as **muscle fibers, bacteria, and blood flow** in capillaries using his self-made simple microscopes. *Louis Pasteur* - **Louis Pasteur** was a French microbiologist and chemist renowned for his discoveries concerning the **principles of vaccination, microbial fermentation, and pasteurization** [1]. - He is particularly known for his experiments that disproved the theory of **spontaneous generation**, firmly establishing microorganisms as the cause of infectious diseases [1]. **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. 23-24.

Q: Which type of necrosis is characterized by deposition of immune complexes and fibrin in the walls of blood vessels?

Fibrinoid necrosis. ***Fibrinoid necrosis*** - This type of necrosis is classically associated with **immune-mediated vascular damage**, where antigen-antibody complexes are deposited in arterial walls [2]. - The microscopic appearance is characterized by bright pink, amorphous material composed of **fibrin and immune complexes**, giving a fibrin-like staining pattern [1]. *Liquefactive necrosis* - Characterized by the **dissolution of dead cells into a viscous liquid mass**, often seen in bacterial infections or brain infarcts. - The necrotic tissue is replaced by inflammatory cells and fluid, rather than immune complex deposits. *Coagulative necrosis* - Occurs due to **ischemia**, leading to protein denaturation and preservation of cell outlines for a period. - It does not involve the deposition of immune complexes or fibrin in vessel walls. *Caseous necrosis* - A form of coagulative necrosis associated with **tuberculosis**, characterized by a friable, "cheese-like" appearance. - It primarily involves granulomatous inflammation and macrophage accumulation, not immune complex deposition in blood vessels. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of Infancy and Childhood, pp. 514-518. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of the Immune System, pp. 214-242.

Question 1

Stain used in electron microscopy

Accepted Answer

Phosphotungstic acid

Answer

Coomassie blue

Answer

2.5% FAM

Answer

Saffranin

Question 2

Which type of radiation effect results in radiation induced thyroid cancer?

Accepted Answer

Somatic

Answer

Teratogenic

Answer

Genetic

Answer

Deterministic

Question 3

Asteroid bodies in non-caseating granulomas are characteristically seen in:

Accepted Answer

Sarcoidosis

Answer

Sporotrichosis

Answer

Chromoblastomycosis

Answer

Syphilis

Question 4

Microscopically, epimyoepithelial islands are typically seen in:

Accepted Answer

Sjögren's syndrome

Answer

Epithelial-myoepithelial carcinoma

Answer

Myoepithelioma

Answer

Mucoepidermoid carcinoma

Question 5

A 28-year-old woman is pinned by falling debris during a hurricane. An X-ray film of the leg reveals a compound fracture of the right tibia. The leg is immobilized in a cast for 6 weeks. When the cast is removed, the patient notices that her right leg is weak and visibly smaller in circumference than the left leg. Which of the following terms best describes this change in the patient's leg muscle?

Accepted Answer

Atrophy

Answer

Hyperplasia

Answer

Metaplasia

Answer

Ischemic necrosis

Question 6

In a patient with gouty arthritis, synovial fluid aspiration will show:

Accepted Answer

Monosodium Urate crystals

Answer

Calcium Pyrophosphate crystals

Answer

Mononuclear Leucocytosis

Answer

Polymorphonuclear Leukocytosis

Question 7

Radiation mediates its effect by

Accepted Answer

Ionization of the molecules

Answer

Protein coagulation

Answer

Osmolysis of cells

Answer

Denaturation of DNA

Question 8

Which of the following is most sensitive to radiation

Accepted Answer

Lymphocyte

Answer

Stem cells

Answer

Skin

Answer

Bone

Question 9

Who is the founder of the electron microscope?

Accepted Answer

Ernst Ruska

Answer

Robert Koch

Answer

Antonie Philips van Leeuwenhoek

Answer

Louis Pasteur

Question 10

Which type of necrosis is characterized by deposition of immune complexes and fibrin in the walls of blood vessels?

Accepted Answer

Fibrinoid necrosis

Answer

Liquefactive necrosis

Answer

Coagulative necrosis

Answer

Caseous necrosis

General Pathology — MCQs

General Pathology — MCQs

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