Epithelial Tissue — MCQs
Microscopically, epimyoepithelial islands are typically seen in:
Intercalated ducts of serous acinar glands are lined by
This type of epithelium is most commonly seen in which of the following organs?
Epithelial lining of the urinary bladder is?
All of the following are features of Lymph node histology except:
The mucosal lining of the vagina is composed of cells:
What is the most likely diagnosis for the parotid mass with mixed consistency shown in the image?
Statement 1 - A 59-year-old patient presents with flaccid bullae. Histopathology shows a suprabasal acantholytic split. Statement 2 - The row of tombstones appearance is diagnostic of Pemphigus vulgaris.
Which of the following is an intermediate filament found in epithelial cells?
Identify the type of connective tissue present in the image.
Epithelial Tissue Indian Medical PG Practice Questions and MCQs
Question 1: Microscopically, epimyoepithelial islands are typically seen in:
- A. Epithelial-myoepithelial carcinoma
- B. Myoepithelioma
- C. Mucoepidermoid carcinoma
- D. Sjögren's syndrome (Correct Answer)
Explanation: ***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.
Question 2: Intercalated ducts of serous acinar glands are lined by
- A. Stratified columnar
- B. Simple Columnar
- C. Stratified squamous
- D. Simple cuboidal (Correct Answer)
Explanation: Simple cuboidal - The **intercalated ducts** of **serous acinar glands** (such as parotid and pancreas) are lined by **simple cuboidal epithelium**. - This type of epithelium is well-suited for the initial drainage of serous secretions from the acini and allows for efficient transport through the relatively short cells. - Simple cuboidal epithelium provides both structural support and functional activity for these small caliber ducts. *Stratified columnar* - **Stratified columnar epithelium** is rare and found in specific locations like parts of the **male urethra** and some large excretory ducts. - It is not characteristic of the small intercalated ducts of serous acinar glands. *Simple Columnar* - **Simple columnar epithelium** lines **striated ducts** (the larger ducts downstream from intercalated ducts) and excretory ducts of some glands. - While found in the ductal system, it is not the epithelium of the **intercalated ducts** specifically, which are the smallest and most proximal ducts. *Stratified squamous* - **Stratified squamous epithelium** is primarily designed for protection against abrasion, found in areas like the **skin** and **esophagus**. - It is entirely unsuitable for the secretory drainage functions of glandular ducts.
Question 3: This type of epithelium is most commonly seen in which of the following organs?
- A. Ureter
- B. Trachea (Correct Answer)
- C. Duodenum
- D. Gall bladder
- E. Esophagus
Explanation: ***Trachea*** - The image displays **pseudostratified columnar epithelium with cilia and goblet cells**, which is characteristic of the respiratory tract, including the trachea. - This specialized epithelium functions to trap and expel foreign particles from the airways, ensuring respiratory health. *Ureter* - The ureter is lined by **transitional epithelium** (urothelium), which is characterized by its ability to stretch. - This epithelium would show a cuboidal to columnar appearance when relaxed and a flattened appearance when stretched, and the cells on the surface are typically dome-shaped, unlike the image. *Duodenum* - The duodenum is lined by **simple columnar epithelium** with a brush border and numerous goblet cells for absorption and mucus secretion. - It also features **villi and crypts of Lieberkühn**, which are not seen in the provided image. *Gall bladder* - The gallbladder is lined by **simple columnar epithelium** with microvilli, specialized for water absorption. - It lacks the cilia and pseudostratified arrangement evident in the given histopathology slide. *Esophagus* - The esophagus is lined by **non-keratinized stratified squamous epithelium**, designed to protect against abrasion from food passage. - This epithelium appears as multiple layers of flattened cells, completely different from the tall, columnar, ciliated cells shown in the image.
Question 4: Epithelial lining of the urinary bladder is?
- A. Squamous epithelium
- B. Transitional epithelium (Correct Answer)
- C. Cuboidal epithelium
- D. Columnar epithelium
Explanation: ***Transitional epithelium*** - The urinary bladder is lined by **transitional epithelium**, also known as **urothelium** [1]. - This specialized epithelium can stretch and flatten when the bladder fills with urine, and then contract when it empties, a crucial adaptation for its function. *Squamous epithelium* - **Stratified squamous epithelium** is typically found in areas subject to abrasion, such as the skin, esophagus, and vagina. - It does not possess the unique distensibility required for the urinary bladder's function. *Cuboidal epithelium* - **Cuboidal epithelium** is commonly found in glands and kidney tubules, where it is involved in secretion and absorption. - It is not specialized for the significant stretching and recoiling seen in the urinary bladder. *Columnar epithelium* - **Columnar epithelium** is primarily involved in secretion and absorption and is found in regions like the gastrointestinal tract and some glandular ducts. - It lacks the necessary structural characteristics to accommodate the large volume changes of the urinary bladder.
Question 5: All of the following are features of Lymph node histology except:
- A. Both Efferent and Afferent are present
- B. Subcapsular sinus present
- C. Cortex and Medulla are present
- D. Red pulp and White pulp are present (Correct Answer)
Explanation: ***Red pulp and White pulp are present*** - **Red pulp** and **white pulp** are characteristic histological features of the **spleen**, not lymph nodes [1]. - The white pulp contains lymphoid follicles (PALS - periarteriolar lymphoid sheaths), while the red pulp is involved in filtering blood and destroying old red blood cells [1]. - This is the feature that does NOT belong to lymph node histology. *Both Efferent and Afferent are present* - Lymph nodes have multiple **afferent lymphatic vessels** that bring lymph into the node and usually one or two **efferent lymphatic vessels** that carry lymph away [2]. - This arrangement allows for efficient filtering of lymph and immune surveillance [2]. - This IS a feature of lymph nodes. *Subcapsular sinus present* - The **subcapsular sinus** is a space located directly beneath the capsule of the lymph node, which receives lymph from the afferent lymphatic vessels. - It contains a network of reticular fibers and macrophages, acting as the initial filtering area. - This IS a feature of lymph nodes. *Cortex and Medulla are present* - Lymph nodes are histologically divided into an outer **cortex** and an inner **medulla**. - The cortex contains lymphoid follicles (B-cell areas) and paracortical areas (T-cell areas), while the medulla consists of medullary cords and sinuses. - This IS a feature of lymph nodes.
Question 6: The mucosal lining of the vagina is composed of cells:
- A. Stratified squamous non-keratinized (Correct Answer)
- B. Ciliated columnar epithelium
- C. Pseudostratified columnar epithelium
- D. Transitional epithelium
Explanation: ***Stratified squamous non-keratinized*** - The **vaginal epithelium** is composed of several layers of flattened, nucleated cells that provide **protection against friction** and resist pathogen entry during intercourse and childbirth [1]. - The **non-keratinized nature** ensures the mucosa remains moist and flexible, essential for its function. *Ciliated columnar epithelium* - This type of epithelium is found in locations like the **fallopian tubes** and parts of the **respiratory tract**, where cilia help in moving fluids or particles. - It does not provide the robust protective barrier required for the vagina. *Pseudostratified columnar epithelium* - This epithelium, characterized by nuclei at different levels giving a "pseudostratified" appearance, is typically found in the **trachea** and **bronchi**. In the uterus, however, the endometrial glands are lined by regular, tall, pseudostratified columnar cells during the proliferative phase [2]. - Its primary function is secretion and absorption, not the physical protection needed in the vagina. *Transitional epithelium* - Also known as **urothelium**, this type is specialized to accommodate stretching and is found in the **urinary bladder** and ureters. - It is not suited for the constant friction and protective role of the vaginal lining.
Question 7: What is the most likely diagnosis for the parotid mass with mixed consistency shown in the image?
- A. Pleomorphic adenoma (Correct Answer)
- B. Sebaceous cyst
- C. Dermoid cyst
- D. None of the options
Explanation: ***Pleomorphic adenoma*** - The **mixed consistency** of the parotid mass indicates a **benign tumor**, predominantly of epithelial and mesenchymal origin, typical of pleomorphic adenomas. - This type of tumor is usually **pain-free** and can exhibit a **soft** and **firm** texture on examination [1]. *Sebaceous cyst* - Typically presents as a **smooth, fluctuant nodule** and usually has a **firm consistency** rather than mixed. - Generally not seen as a parotid mass; usually found on the skin in areas with sebaceous glands. *Dermoid cyst* - Generally presents as a **well-defined, soft, and mobile mass**, not commonly associated with mixed consistency. - Often contains **keratin** and has a more homogenous consistency rather than the mixed characteristics of pleomorphic adenoma. *All* - As not all options are suitable for the description of a **mixed consistency parotid mass**, this option is incorrect. - Only **pleomorphic adenoma** aligns with the specific clinical presentation detailed in the question [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Head and Neck, pp. 751-753.
Question 8: Statement 1 - A 59-year-old patient presents with flaccid bullae. Histopathology shows a suprabasal acantholytic split. Statement 2 - The row of tombstones appearance is diagnostic of Pemphigus vulgaris.
- A. Statements 1 & 2 are correct, 2 is not explaining 1 (Correct Answer)
- B. Statements 1 and 2 are correct and 2 is the correct explanation for 1
- C. Statements 1 and 2 are incorrect
- D. Statement 1 is incorrect
Explanation: ***Correct: Statements 1 & 2 are correct, 2 is not explaining 1*** **Analysis of Statement 1:** - A 59-year-old patient with **flaccid bullae** and **suprabasal acantholytic split** on histopathology is the classic presentation of **Pemphigus vulgaris** - The flaccid (easily ruptured) nature of bullae distinguishes it from tense bullae seen in bullous pemphigoid - The suprabasal location of the split (just above the basal layer) with acantholysis (loss of cell-to-cell adhesion) is pathognomonic - **Statement 1 is CORRECT** ✓ **Analysis of Statement 2:** - The **"row of tombstones" or "tombstone appearance"** is indeed a diagnostic histopathological feature of Pemphigus vulgaris - This appearance results from basal keratinocytes remaining attached to the basement membrane while suprabasal cells separate due to acantholysis - The intact basal cells standing upright resemble a row of tombstones - **Statement 2 is CORRECT** ✓ **Does Statement 2 explain Statement 1?** - Statement 2 describes a **histopathological appearance** (tombstone pattern) that is a **consequence** of the suprabasal split - However, it does NOT explain the **underlying cause** of the flaccid bullae or the suprabasal split - The true explanation involves **IgG autoantibodies against desmoglein 3 (and desmoglein 1)**, which attack intercellular adhesion structures (desmosomes), causing **acantholysis** - Therefore, **Statement 2 does NOT explain Statement 1** ✗ *Incorrect: Statement 2 is the correct explanation for Statement 1* - While both statements describe features of Pemphigus vulgaris, the tombstone appearance is a descriptive finding, not an explanatory mechanism *Incorrect: Statements 1 and 2 are incorrect* - Both statements are medically accurate descriptions of Pemphigus vulgaris features *Incorrect: Statement 1 is incorrect* - Statement 1 correctly describes the cardinal clinical and histopathological features of Pemphigus vulgaris
Question 9: Which of the following is an intermediate filament found in epithelial cells?
- A. Cytokeratin (Correct Answer)
- B. Neurofilaments
- C. Desmin (muscle filament)
- D. Vimentin (mesenchymal filament)
Explanation: ***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.
Question 10: Identify the type of connective tissue present in the image.
- A. Loose and irregular
- B. Specialized
- C. Dense irregular (Correct Answer)
- D. Dense regular
Explanation: ***Dense irregular*** - The image shows **densely packed collagen fibers** arranged in an **irregular, haphazard fashion**, characteristic of dense irregular connective tissue. - This type of tissue provides **strength** and resistance to stress from multiple directions, found in the **dermis of the skin** and organ capsules. *Loose and irregular* - **Loose connective tissue** would show more ground substance and fewer, loosely arranged fibers, whereas this image displays high fiber density. - While it is "irregular" in fiber arrangement, the density of fibers rules out the "loose" classification. *Specialized* - **Specialized connective tissues** include cartilage, bone, blood, and adipose tissue, which have distinct cellular and extracellular matrix components not seen here. - This tissue lacks the specific cellular and matrix characteristics that would classify it as specialized (e.g., chondrocytes in lacunae, osteocytes, blood cells). *Dense regular* - **Dense regular connective tissue** features collagen fibers arranged in parallel bundles, providing strength in one direction. - Examples include **tendons and ligaments**, which are structurally organized in an orderly, aligned manner, unlike the displayed irregular arrangement.
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