Gastrointestinal Pathology — MCQs

Gastrointestinal Pathology Indian Medical PG Practice Questions and MCQs

Question 491: What is the commonest benign tumor of the esophagus?

A. Leiomyoma (Correct Answer)
B. Papilloma
C. Adenoma
D. Hemangioma

Explanation: ***Leiomyoma*** - **Leiomyomas** are the most common benign tumors of the esophagus, originating from the **smooth muscle layer** of the esophageal wall. - They are typically **asymptomatic** but can cause dysphagia or substernal pain if large. *Papilloma* - **Papillomas** are benign epithelial tumors that can occur in the esophagus but are less common than leiomyomas. - They are often associated with **human papillomavirus (HPV) infection** and rarely grow to a significant size. *Adenoma* - **Adenomas** are benign glandular tumors, and while esophageal adenocarcinoma exists, benign adenomas of the esophagus are extremely rare. - The esophagus is primarily lined by **squamous epithelium**, making glandular tumors less common. *Hemangioma* - **Hemangiomas** are benign tumors composed of blood vessels; they can occur in various parts of the body, including the esophagus, but are very rare in this location. - Esophageal hemangiomas are typically small and often discovered incidentally.

Question 492: Which condition is characterized by skip lesions in the gastrointestinal tract?

A. Ulcerative colitis
B. Crohn's disease (Correct Answer)
C. Whipple's disease
D. Reactive arthritis

Explanation: ***Crohn's disease*** [1] - Characterized by **skip lesions** which are segmental areas of inflammation interspersed with normal bowel, consistent with the presence of **granulomatous inflammation** [1][2][3]. - It can affect any part of the gastrointestinal tract [1], often leading to chronic symptoms like **abdominal pain** and **diarrhea**. *Reiter's disease* - Primarily manifests as **arthritis**, **urethritis**, and **conjunctivitis**, without granulomatous lesions. - It is a reactive arthritis often associated with infection rather than inflammatory bowel disease. *Ulcerative colitis* - Characterized by continuous lesions of the colon and does not exhibit the **skip lesions** typical of Crohn's disease. - Mainly involves the **mucosal layer** and is associated with symptoms like **bloody diarrhea** and mucosal ulceration. *Whipple's disease* - Caused by *Tropheryma whipplei*, leading to **malabsorption syndrome**; however, it is not associated with skip lesions. - It typically involves the **gut mucosa** and has systemic manifestations, rather than the localized granulomatous lesions seen in Crohn's disease. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Alimentary System Disease, pp. 365-366. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Alimentary System Disease, pp. 366-367. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, pp. 806-807.

Question 493: A 5-year-old child was admitted to the hospital for a prolapsing rectal mass and painless rectal bleeding. Histopathological examination reveals enlarged and inflamed glands filled with mucin. What is the likely diagnosis?

A. Adenoma (precancerous lesion in adults)
B. Juvenile polyp (Hamartoma) (Correct Answer)
C. Carcinoma (malignant tumor, rare in children)
D. Choristoma (benign growth of normal tissue in an abnormal location)

Explanation: ***Juvenile polyp (Hamartoma)*** - **Juvenile polyps** are the most common cause of rectal bleeding in children, often presenting as a **prolapsing rectal mass** and **painless bleeding**. - Histologically, they are characterized by **enlarged, inflamed glands filled with mucin**, consistent with a hamartomatous origin. *Adenoma (precancerous lesion in adults)* - While adenomas can cause rectal bleeding and prolapse, they are typically found in **adults** and are considered **precancerous lesions** [1]. - The patient's young age (5-year-old) makes an adenoma highly unlikely [1]. *Carcinoma (malignant tumor, rare in children)* - **Colorectal carcinoma** is exceedingly **rare in children** and usually presents with more aggressive symptoms than painless bleeding, such as weight loss or anemia [2]. - The histological description of inflamed, mucin-filled glands is not typical for carcinoma [2]. *Choristoma (benign growth of normal tissue in an abnormal location)* - A **choristoma** is a benign growth of normal tissue in an abnormal location, but it does not typically present as a rectal mass or cause rectal bleeding. - The microscopic findings of enlarged and inflamed glands filled with mucin are not characteristic of a choristoma. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Alimentary System Disease, pp. 371-372. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, pp. 821-822.

Question 494: Identify the condition shown in the image.

A. Villous adenoma
B. Hyperplastic polyp
C. Juvenile polyp
D. Peutz-Jeghers syndrome (Correct Answer)

Explanation: ***Juvenile polyp*** - Juvenile polyps are commonly found in children and present as **solitary lesions**, usually in the rectum [1]. - They typically appear **smooth**, with a characteristic lobulated surface, emphasizing their benign nature. *Villous adenoma* - Villous adenomas are characterized by **frond-like projections** and have a higher risk of malignant transformation [2]. - These lesions usually occur in adults and are typically larger and more **invasive** compared to juvenile polyps [2]. *Hyperplastic polyp* - Hyperplastic polyps are small, **benign lesions** that result from epithelial overgrowth with a typical **smooth surface** [3]. - They are usually found in the colon and do not present with the distinctive features of juvenile polyps. *Peutz-Jeghers polyp* - Peutz-Jeghers polyps are associated with **Peutz-Jeghers syndrome** and exhibit a **hamartomatous** appearance, often protruding from various gastrointestinal sites [1]. - These polyps are typically more **complex** and can be found in older children and adults, differing significantly from juvenile polyps [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, p. 813. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Alimentary System Disease, pp. 371-372. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, pp. 811-813.

Question 495: A 5-year-old child presented with a history of blood in the stools. On examination, there was a polypoid mass in the rectum, a biopsy of which showed as below. The most probable diagnosis is?

A. Villous adenoma
B. Juvenile polyp (Correct Answer)
C. Vascular malformation
D. Serrated adenoma

Explanation: ***Juvenile polyp*** - The image shows **dilated, cystically appearing glands** within an inflamed lamina propria, which is characteristic of a juvenile polyp. - Juvenile polyps are the most common cause of **rectal bleeding** in children under 10 years of age and are typically benign. *Villous adenoma* - Villous adenomas are **neoplastic polyps** with a **villous (finger-like) architecture** and are more commonly seen in older adults [1]. - They typically show **dysplastic changes** and are considered premalignant [1]. *Vascular malformation* - Vascular malformations consist of **abnormally formed blood vessels** (e.g., arteriovenous malformations, hemangiomas) and would appear as dilated or aberrant vessels on histology. - While they can cause bleeding, the image does not show a predominance of vascular structures. *Serrated adenoma* - Serrated adenomas are characterized by **sawtooth-like glandular infoldings** and show varying degrees of dysplasia. - They are typically found in adults and are considered premalignant, not benign growths usually found in children. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Alimentary System Disease, pp. 371-372.

Question 496: Which of the following statements about Barrett’s esophagus is false?

A. Causes adenocarcinoma (Correct Answer)
B. Chronic gastroesophageal reflux is a predisposing factor
C. Patient is usually asymptomatic
D. Histology of the lesion shows mucus secreting goblet cells

Explanation: ***Causes adenocarcinoma*** - Barrett's esophagus itself is a **precursor lesion**, not a definitive cause of adenocarcinoma; it significantly increases the risk of this malignancy [1]. - It manifests due to **intestinal metaplasia** in the lower esophagus, which can progress to **dysplasia** and eventually cancer [1]. *Patient is usually asymptomatic* - Many patients may be **asymptomatic** or have mild symptoms; however, this statement is misleading as Barrett's esophagus can present with **symptoms of GERD** [2]. - The presence of **gastroesophageal reflux disease (GERD)** is common, which could lead to symptoms despite the condition itself being silent [2]. *Histology of the lesion shows mucus secreting goblet cells* - While goblet cells are present in Barrett's esophagus lesions, this statement can be misleading because it implies that their presence alone is definitive for diagnosis. - Correctly, the presence of **intestinal-type mucosa** with goblet cells is a hallmark feature [1], but it should be evaluated in the context of the overall histological assessment. *Chronic gastroesophageal reflux is a predisposing factor* - Barrett's esophagus is strongly associated with **chronic gastroesophageal reflux disease (GERD)**, which is a key risk factor for its development [1]. - The reflux of **acidic gastric contents** damages the esophageal lining, leading to metaplastic changes, hence establishing a link between GERD and Barrett's esophagus [1]. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Alimentary System Disease, pp. 348-349. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, pp. 764-765.

Question 497: Which histological feature is more characteristically associated with Ulcerative Colitis compared to Crohn's Disease?

A. Presence of pseudopolyps in the mucosa
B. Mucosal edema and inflammation
C. Crypt abscesses in the mucosa (Correct Answer)
D. Lymphoid aggregates in the submucosa

Explanation: ***Crypt abscess*** - The presence of **crypt abscesses** is a distinguishing histological feature of **ulcerative colitis**, indicating **inflammation** within the crypts [1]. - This feature is not characteristic of Crohn's disease, which presents with a patchy distribution of inflammation [3]. *Diffuse distribution of pseudopolyps* - While **pseudopolyps** can occur in ulcerative colitis, they are **not histological differences** but rather **morphological features** observed in cases of longstanding disease. - Crohn's disease typically shows **skip lesions**, which contrasts with the more extensive mucosal changes seen in ulcerative colitis [3]. *Lymphoid aggregates in the mucosa* - Lymphoid aggregates are more commonly found in **Crohn's disease**, where they suggest the presence of a **transmural inflammatory process** [2,3]. - In ulcerative colitis, there is a more uniform mucosal inflammation and an absence of significant lymphoid aggregation [3]. *Mucosal edema* - Mucosal edema can appear in both conditions but does **not provide a clear histological difference** between ulcerative colitis and Crohn's disease. - The edema is more related to the **acute inflammatory response** rather than a differential histological feature. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, p. 809. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, pp. 806-807. [3] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Alimentary System Disease, pp. 365-368.

Question 498: In a patient presenting with gallbladder abnormalities, which condition is characterized by a speckled appearance of the gallbladder mucosa resembling a strawberry?

A. Gangrene of the gallbladder
B. Porcelain gallbladder
C. Adenomatosis of the gallbladder
D. Cholesterolosis of the gallbladder (Correct Answer)

Explanation: ***Cholesterolosis of the gallbladder*** - This condition is characterized by the accumulation of **cholesterol esters** and **triglycerides** within macrophages in the lamina propria of the gallbladder, creating a **speckled appearance** often referred to as a "**strawberry gallbladder**". - It is typically asymptomatic but can be associated with **cholelithiasis** (gallstones) in some cases. *Gangrene of the gallbladder* - This is a severe complication of **acute cholecystitis** where the gallbladder tissue dies due to **ischemia**, often appearing necrotic and dark, not speckled. - It presents with severe abdominal pain, fever, and signs of **sepsis**, which is distinct from a speckled appearance. *Porcelain gallbladder* - This condition involves **extensive calcification of the gallbladder wall**, making it brittle and rigid, and is often associated with an increased risk of gallbladder cancer. - Its appearance is typically hard and white due to calcification, not speckled like a strawberry. *Adenomatosis of the gallbladder* - This term is often used interchangeably with **adenomyomatosis**, which involves **hypertrophy of the muscularis propria** and **outpouchings of the mucosa** (Rokitansky-Aschoff sinuses). - It presents as nodular or diffuse thickening of the gallbladder wall, not a speckled mucosal pattern.

Question 499: Most significant risk factor for development of gastric carcinoma is

A. Pyloric metaplasia
B. Intestinal metaplasia (Correct Answer)
C. Ciliated metaplasia
D. Paneth cell metaplasia

Explanation: ***Intestinal metaplasia*** - **Intestinal metaplasia** is a precursor lesion where gastric epithelium is replaced by intestinal-type epithelium, significantly increasing the risk for **gastric carcinoma** [1][2]. - It is a recognized **high-risk factor**, especially in cases of chronic gastritis and atrophic changes in the stomach lining [1][2]. *Ciliated metaplasia* - This condition is generally associated with **respiratory epithelium** and is not linked to gastric carcinoma risk. - It does not involve gastric epithelial changes, therefore, it does not influence **gastric cancer development**. *Pyloric metaplasia* - Pyloric metaplasia typically occurs in chronic gastritis but does not confer a significant **risk** of gastric carcinoma. - It is more related to gastric mucosa adaptation and does not show the same risk association as **intestinal metaplasia**. *Paneth cell metaplasia* - Paneth cell metaplasia is primarily seen in **intestinal disorders** and does not serve as an indicator for gastric carcinoma. - It does not reflect changes in gastric epithelium that are related to cancer risk in the stomach. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, pp. 777-778. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Alimentary System Disease, pp. 354-355.

Question 500: Centrilobular necrosis of the liver may be seen with?

A. Arsenic
B. Ethanol
C. CCl4 (Correct Answer)
D. Phosphorus

Explanation: ***CCl4*** - **Carbon tetrachloride (CCl4)** is the **classic and prototypical** hepatotoxin that causes **centrilobular (zone 3) necrosis**. - The **centrilobular zone (zone 3)** is particularly vulnerable due to its high concentration of **cytochrome P450 enzymes**, which metabolize CCl4 into **toxic free radicals (trichloromethyl radicals)**. - This is the **most characteristic** cause of centrilobular necrosis in toxicology and is the preferred answer for exam purposes. *Ethanol* - **Ethanol** can also cause **centrilobular necrosis** in **alcoholic hepatitis**, as zone 3 is most susceptible to hypoxic injury and oxidative stress. - However, alcoholic liver disease presents with a **spectrum of changes** including steatosis (earliest), hepatitis with ballooning degeneration and Mallory-Denk bodies, and eventual cirrhosis. - While centrilobular necrosis occurs in alcoholic hepatitis, **CCl4 remains the prototype** for pure centrilobular necrosis in exam contexts. *Phosphorus* - **Elemental phosphorus** toxicity causes **periportal (zone 1) necrosis**, which is the opposite pattern from centrilobular necrosis. - It also causes widespread fatty change and hemorrhagic necrosis within the liver. *Arsenic* - **Arsenic poisoning** causes **diffuse/generalized hepatocellular necrosis** and cholestasis, rather than the specific centrilobular pattern. - Chronic exposure is associated with non-cirrhotic portal fibrosis and portal hypertension.

Practice by Chapter

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Intestinal Obstruction

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Appendiceal Pathology

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