Gastrointestinal Pathology Practice Questions

Q: Which of the following is true about menetrier's disease

There is decreased gastric acid secretion. ***It is a premalignant condition*** - Menetrier's disease is characterized by **hyperplastic gastric mucosa** and is considered a **premalignant condition** due to its association with gastric cancers. - Regular surveillance and monitoring are recommended because of this increased risk for malignancy. *Affects the stomach and small intestines* - Menetrier's disease primarily **affects the stomach**, specifically leading to excessive growth of the gastric mucosa. - It does not typically involve the **small intestines**, which differentiates it from other gastrointestinal diseases. *There is increased gastric acid secretion* - In Menetrier's disease, there is actually a **decreased gastric acid secretion** due to the alteration of gastric mucosal structure. - This condition leads to **hypochlorhydria**, contrasting with conditions that increase acid secretion like Zollinger-Ellison syndrome. *Atrophied mucosal folds are seen* - Menetrier's disease is marked by **hypertrophy of the gastric folds**, not atrophy, resulting in **enlarged rugae** within the stomach. - Atrophied mucosal folds are more associated with conditions like chronic atrophic gastritis.

Q: Which of the following markers is specific for gastro-intestinal stromal tumor (GIST)?

CD117. ***CD 117*** - CD 117 (c-KIT) is the **primary marker** for gastrointestinal stromal tumors (GIST), indicating the presence of the **c-KIT gene mutation** [1]. - Its expression is crucial for diagnosing GISTs, as it is found in nearly all cases of these tumors. *CD 34* - While CD 34 is expressed in some GISTs, it is a **more general marker** associated with stem cells and not specific for GISTs. - GISTs can be negative for CD 34, making it unsuitable for definitive diagnosis. *S-100* - S-100 is typically a marker for **melanocytes** and neuroectodermal tumors, not for GISTs. - It is often used to identify **schwannomas** or **melanomas**, which are unrelated to GIST pathology. *CD 23* - CD 23 is primarily a marker for **chronic lymphocytic leukemia (CLL)** and some forms of lymphoma, not associated with GISTs. - Its presence indicates **lymphoid** lineage, further diverging from GISTs, which are **mesenchymal tumors**. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, pp. 782-783.

Q: Which of the following is a premalignant lesion for carcinoma of the rectum?

Adenomatous polyps. ***Adenomatous polyps*** - **Adenomatous polyps** are the classic premalignant lesions that progress to colorectal carcinoma through the well-established **adenoma-carcinoma sequence**. - These polyps contain **dysplastic epithelium** with potential for malignant transformation, making them the most important precursor lesion for rectal cancer. *Juvenile polyposis* - **Juvenile polyps** are hamartomatous lesions that are generally **benign** and rarely undergo malignant transformation. - They lack the **dysplastic changes** characteristic of true premalignant lesions and do not follow the adenoma-carcinoma pathway. *Familial adenomatous polyposis* - **FAP** is a **hereditary syndrome** characterized by hundreds to thousands of adenomatous polyps, not a single discrete premalignant lesion. - While FAP patients develop rectal cancer due to the numerous **adenomatous polyps** they harbor, FAP itself is the syndrome rather than the individual premalignant lesion. *Hyperplastic polyps* - **Hyperplastic polyps** are non-neoplastic lesions composed of **mature epithelial cells** without dysplasia. - They have **minimal malignant potential** and are not considered true premalignant lesions for colorectal carcinoma.

Q: What is the most common site for carcinoid tumor?

Ileum. ***Ileum*** - The **ileum** is the most common site for carcinoid tumors, accounting for nearly **50%** of cases [1]. - Carcinoid tumors arise from **neuroendocrine cells** in the gastrointestinal tract, with the ileum being particularly common due to its abundant neuroendocrine tissue [1]. *Appendix* - While carcinoid tumors can occur in the **appendix**, they represent a smaller proportion compared to those found in the ileum. - Typical carcinoid tumors in the appendix are often **asymptomatic** and usually detected incidentally. *Lung* - Though lung carcinoids exist, they represent a different classification of carcinoid tumors, primarily occurring in the **bronchial tree** [2]. - They are less common than those in the gastrointestinal tract, particularly the ileum. *Esophagus* - Carcinoid tumors are rare in the **esophagus** and typically have different presentations compared to gastrointestinal carcinoids. - The esophagus is not a common site for carcinoid tumors, which are primarily found in the intestinal tract. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, pp. 780-781. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Lung, p. 727.

Q: Most significant risk factor for development of gastric carcinoma is

Intestinal metaplasia. ***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.

Q: Hose pipe appearance of intestine is a feature of

Ulcerative colitis. ***Crohns disease*** - The **hose pipe appearance** of the intestine on imaging is due to **transmural inflammation** and **strictures**, characteristic of Crohn's disease [1]. - This feature indicates a **narrowed lumen** due to fibrosis, often affecting the small intestine or colon [1]. *Malabsorption syndrome* - This condition is primarily associated with **nutrient absorption issues**, not structural changes in the intestine. - It typically presents with **diarrhea**, **weight loss**, and **malnutrition**, lacking the characteristic imaging findings. *Ulcerative colitis* - Usually presents with **continuous lesions** confined to the colonic mucosa, leading to ulcers and inflammation but not a **hose pipe appearance**. - Symptoms include **bloody diarrhea** and **abdominal pain**, distinctly different from Crohn's disease. *Hirsprung disease* - A congenital condition causing **intestinal obstruction** due to the absence of ganglion cells, leading to **dilated proximal bowel** rather than a hose pipe appearance. - Typically presents in infants with **severe constipation** and **abdominal distension**, unrelated to imaging features 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. 366-367.

Q: Pseudomembranous colitis, all are true except:

Blood in stools is a common feature. ***Blood in stools is a common feature*** - While diarrhea is a hallmark of **pseudomembranous colitis**, **bloody stools** are uncommon and, if present, suggest severe disease or an alternative diagnosis [1]. - The typical presentation involves **watery diarrhea**, abdominal cramps, and fever, not usually overt bleeding [1]. *Toxin A is responsible for clinical manifestation* - **Toxin A (TcdA)** is one of the primary exotoxins produced by *Clostridioides difficile* and contributes significantly to the **inflammation** and fluid secretion seen in pseudomembranous colitis. - It acts as an **enterotoxin**, causing fluid secretion and mucosal damage in the colon [1]. *Summit lesions are early histopathological findings* - **Summit lesions**, also known as "summit pseudomembranes" or **"volcano lesions"**, refer to characteristic histological findings where inflammatory exudates effuse from the tips of damaged crypts. - These are typical early findings in pseudomembranous colitis, demonstrating the focal nature of the **mucosal injury**. *Toxin B is responsible for clinical manifestation* - **Toxin B (TcdB)** is another key exotoxin produced by *Clostridioides difficile*, and it is considered even more **cytotoxic** than Toxin A [1]. - It causes significant **cell damage** and **apoptosis**, playing a crucial role in the development of the pseudomembranes and clinical symptoms [1].

Q: Gastric carcinoma is associated with all of the following EXCEPT:

Activation of RAS. ***Activation of RAS*** - **RAS mutations** are relatively uncommon in gastric carcinoma compared to other gastrointestinal malignancies. While KRAS mutations can occur in approximately 10-15% of gastric cancers (particularly intestinal type), they are **far less frequent** than in **pancreatic adenocarcinoma** (~90%) or **colorectal carcinoma** (~40%). - In the context of gastric carcinoma, RAS pathway alterations are **not considered a major oncogenic driver** compared to the other molecular changes listed, making this the **LEAST characteristically associated** alteration. *Inactivation of p53* - **Inactivation of the p53 tumor suppressor gene** is one of the most frequent molecular events in gastric carcinoma, occurring in approximately **50-60% of cases**. - Loss of p53 function leads to genomic instability, uncontrolled cell proliferation, and resistance to apoptosis, contributing significantly to **tumorigenesis** and **poor prognosis**. *Over expression of C-met* - **Overexpression of C-MET**, a receptor tyrosine kinase for hepatocyte growth factor (HGF), is commonly observed in gastric carcinoma (30-40% of cases) and is strongly linked to **tumor growth**, **invasion**, and **metastasis**. - C-MET amplification and overexpression promote cell proliferation, survival, migration, and angiogenesis, making it an important **therapeutic target** in advanced gastric cancer. *Over expression of C-erb* - **Overexpression of C-erbB-2 (HER2/neu)** is found in approximately **10-20% of gastric adenocarcinomas**, particularly the intestinal type. - HER2 amplification or overexpression is a significant **prognostic and predictive biomarker**, and is specifically targeted by **trastuzumab** (Herceptin) therapy in HER2-positive advanced gastric cancer, improving survival outcomes.

Q: Linitis plastica is a type of ?

Manifestation of gastric cancer. ***Diffuse carcinoma of stomach*** - Linitis plastica is a specific type of **gastric cancer** characterized by **thickening of the stomach wall**, leading to a rigid, non-distensible abdomen [1]. - It often presents with **significant weight loss** and **early satiety**, distinguishing it from other stomach conditions. *Benign ulcer* - Benign ulcers do not cause the **extensive wall thickening** or **desmoplastic response** seen in linitis plastica [1]. - They typically heal with treatment and are associated with typical ulcer symptoms, unlike the progressive nature of linitis plastica. *Plastic like lining of stomach* - While linitis plastica describes a **plastic-like appearance**, it is not classified as a mere lining change but rather a sign of underlying **malignancy** [1]. - This option misrepresents it as a benign condition rather than a serious **stomach adenocarcinoma**. *GIST* - Gastrointestinal stromal tumors (GIST) are **soft tissue tumors** of mesenchymal origin, differing fundamentally from the **invasive** characteristics of linitis plastica [2]. - GISTs typically present with **mass lesions** in the GI tract, not the diffuse rigidity seen in linitis plastica [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, pp. 779-780. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, p. 779.

Q: Which of the following is the most common type of tongue cancer?

Squamous cell carcinoma. ***Adenocarcinoma most common*** - The most common type of tongue cancer is **squamous cell carcinoma (SCC)**, not adenocarcinoma [1]. - Adenocarcinomas are less frequently associated with the tongue compared to SCC, which constitutes the majority of cases. *Tobacco is the cause* - Tobacco use is indeed a **significant risk factor** for various head and neck cancers, including tongue cancer [1]. - Smoking and smokeless tobacco are linked to increased incidence and severity of **squamous cell carcinoma** on the tongue [1]. *Deep cervical lymph nodes not involved* - Tongue cancers often metastasize to **deep cervical lymph nodes**, particularly in advanced stages. - Involvement of lymph nodes is a common feature that can affect prognosis and treatment strategies. *Lateral surface involved* - The **lateral surface** of the tongue is a common site for cancerous lesions, especially in cases related to tobacco use. - Tumors might also arise from other surfaces, but lateral involvement is characteristic of **squamous cell carcinoma**. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Lung, pp. 738-739.

Question 1

Which of the following is true about menetrier's disease

Accepted Answer

There is decreased gastric acid secretion

Answer

Atrophied mucosal folds are seen

Answer

It is premalignant condition

Answer

It causes increased gastric acid secretion

Question 2

Which of the following markers is specific for gastro-intestinal stromal tumor (GIST)?

Accepted Answer

CD117

Answer

CD34

Answer

CD23

Answer

S-100

Question 3

Which of the following is a premalignant lesion for carcinoma of the rectum?

Accepted Answer

Adenomatous polyps

Answer

Juvenile polyposis

Answer

Familial adenomatous polyposis

Answer

Hyperplastic polyps

Question 4

What is the most common site for carcinoid tumor?

Accepted Answer

Ileum

Answer

Lung

Answer

Esophagus

Answer

Appendix

Question 5

Most significant risk factor for development of gastric carcinoma is

Accepted Answer

Intestinal metaplasia

Answer

Pyloric metaplasia

Answer

Ciliated metaplasia

Answer

Paneth cell metaplasia

Question 6

Hose pipe appearance of intestine is a feature of

Accepted Answer

Ulcerative colitis

Answer

Malabsorption syndrome

Answer

Crohn's disease

Answer

Hirschsprung disease

Question 7

Pseudomembranous colitis, all are true except:

Accepted Answer

Blood in stools is a common feature

Answer

Toxin A is responsible for clinical manifestation

Answer

Summit lesions are early histopathological findings

Answer

Toxin B is responsible for clinical manifestation

Question 8

Gastric carcinoma is associated with all of the following EXCEPT:

Accepted Answer

Activation of RAS

Answer

Over expression of C-met

Answer

Inactivation of p53

Answer

Over expression of C-erb

Question 9

Linitis plastica is a type of ?

Accepted Answer

Manifestation of gastric cancer

Answer

Benign ulcer

Answer

GIST

Answer

Plastic-like appearance of stomach lining

Question 10

Which of the following is the most common type of tongue cancer?

Accepted Answer

Squamous cell carcinoma

Answer

Lymphoma

Answer

Adenocarcinoma

Answer

Basal cell carcinoma

Gastrointestinal Pathology — MCQs

Gastrointestinal Pathology — MCQs

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