Gastrointestinal Pathology — MCQs

Gastrointestinal Pathology Indian Medical PG Practice Questions and MCQs

Question 61: Positive acid Schiff macrophages are seen in which condition?

A. Whipple's disease (Correct Answer)
B. Crohn's disease
C. Autoimmune deficiency
D. None of the above

Explanation: **Explanation:** The presence of **Periodic Acid-Schiff (PAS)-positive, diastase-resistant macrophages** in the lamina propria of the small intestine is the hallmark histological feature of **Whipple’s disease** [1]. This condition is caused by the gram-positive actinomycete bacterium, *Tropheryma whipplei*. The PAS stain highlights the glycoprotein-rich cell walls of the partially digested bacteria residing within the lysosomes of macrophages. **Analysis of Options:** * **Whipple’s Disease (Correct):** The accumulation of these bulky macrophages leads to the compression of lacteals, resulting in impaired lymphatic transport and the classic clinical triad of malabsorption, diarrhea, and weight loss [1]. * **Crohn’s Disease:** This is characterized by transmural inflammation and **non-caseating granulomas** [2]. While macrophages are present, they do not show the characteristic PAS-positive inclusions seen in Whipple’s. * **Autoimmune Deficiency (HIV/AIDS):** While patients with AIDS can develop *Mycobacterium avium-intracellulare* (MAI) infections which also show PAS-positive macrophages, the gold standard for distinguishing MAI from Whipple’s is the **Acid-Fast Bacillus (AFB) stain** (MAI is AFB positive; *T. whipplei* is AFB negative) [1]. **High-Yield Clinical Pearls for NEET-PG:** * **Organism:** *Tropheryma whipplei* (Gram-positive, non-acid fast) [1]. * **Electron Microscopy:** Shows characteristic **"rod-shaped bacilli."** * **Clinical Presentation:** Often follows the "4Ms": Malabsorption, Melanoderma (hyperpigmentation), Mesenteric lymphadenopathy, and Migratory polyarthritis [1]. * **Treatment:** Long-term antibiotics (usually Ceftriaxone followed by Trimethoprim-sulfamethoxazole). **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, pp. 798-799. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Alimentary System Disease, pp. 366-367.

Question 62: Gastrointestinal stromal malignancy arises from which of the following?

A. Smooth muscle
B. Nerve cells
C. Interstitial cells of Cajal (Correct Answer)
D. Vascular Endothelium

Explanation: **Explanation:** **Gastrointestinal Stromal Tumor (GIST)** is the most common mesenchymal neoplasm of the gastrointestinal tract. **Why the correct answer is right:** GISTs originate from the **Interstitial Cells of Cajal (ICCs)**, which are the "pacemaker cells" of the gut located in the muscularis propria [1]. These cells mediate neurotransmission between autonomic nerves and smooth muscle. The hallmark of GIST is a gain-of-function mutation in the **c-KIT proto-oncogene** (CD117), which encodes a receptor tyrosine kinase [1]. This mutation leads to constitutive signaling for cell proliferation. **Why the incorrect options are wrong:** * **A. Smooth muscle:** Tumors arising from smooth muscle are called Leiomyomas (benign) or Leiomyosarcomas (malignant). While GISTs were historically misclassified as such, they are genetically and immunohistochemically distinct. * **B. Nerve cells:** Tumors of neural origin in the GI tract include Schwannomas or Neurofibromas. * **D. Vascular Endothelium:** Malignancies arising from the vascular endothelium are Angiosarcomas or Kaposi Sarcomas. **High-Yield Clinical Pearls for NEET-PG:** * **Most common site:** Stomach (60%), followed by the small intestine (30%). * **Immunohistochemistry (IHC):** **CD117 (c-KIT)** is the most specific marker (positive in 95%). **DOG1** (Discovered on GIST-1) is a highly sensitive marker for c-KIT negative cases. * **Genetics:** Most have **KIT mutations**; a subset has **PDGFRA** mutations [1]. * **Morphology:** Can show spindle cell (most common) or epithelioid patterns. * **Treatment:** The targeted therapy of choice is **Imatinib** (a tyrosine kinase inhibitor). **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, pp. 782-783.

Question 63: Commonest mutations associated with GIST are in which gene?

A. Platelet-derived growth factor receptor alpha (PDGFRA)
B. Tyrosine kinase KIT (Correct Answer)
C. BRAF
D. NRAS

Explanation: **Explanation:** **Gastrointestinal Stromal Tumor (GIST)** is the most common mesenchymal tumor of the abdomen, arising from the **Interstitial Cells of Cajal (ICC)**, which serve as the gut's pacemaker. **1. Why 'Tyrosine kinase KIT' is correct:** The vast majority of GISTs (**75–85%**) are driven by gain-of-function mutations in the **c-KIT gene** (CD117). This gene encodes a type III receptor tyrosine kinase. The mutation leads to constitutive activation of the kinase signaling pathway, promoting cell proliferation and survival independent of ligand binding [1]. This discovery revolutionized treatment, as these tumors respond well to tyrosine kinase inhibitors like **Imatinib**. **2. Why other options are incorrect:** * **PDGFRA:** Mutations in Platelet-derived growth factor receptor alpha are the second most common (approx. **5–10%**). These are typically found in "KIT-negative" GISTs and are often associated with a gastric primary site and epithelioid morphology [1]. * **BRAF:** Mutations (specifically V600E) are rare in GISTs (<1%) and are usually found in "wild-type" GISTs that lack KIT or PDGFRA mutations [1]. * **NRAS:** While common in melanomas and some leukemias, NRAS mutations are not a primary driver in GIST pathogenesis; however, they may occur in a minority of GISTs lacking KIT or PDGFRA mutations [1]. **High-Yield Clinical Pearls for NEET-PG:** * **Most sensitive marker:** CD117 (c-KIT). * **Most specific/sensitive marker (newer):** DOG1 (Discovered On GIST 1). * **Morphology:** Can be Spindle cell (70%), Epithelioid, or Mixed. * **Carney Triad:** Gastric GIST, Paraganglioma, and Pulmonary Chondroma. * **SDH Mutations:** Associated with "Succinate Dehydrogenase-deficient GIST," typically seen in younger patients and pediatric cases [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, pp. 782-783.

Question 64: What is the most common site of cancer in the stomach?

A. Greater curvature
B. Lesser curvature
C. Fundus
D. Antrum (Correct Answer)

Explanation: **Explanation:** **1. Why Antrum is Correct:** Gastric adenocarcinoma is the most common malignancy of the stomach. Epidemiologically, the **antrum and pylorus** (distal stomach) remain the most frequent sites, accounting for approximately **50-60%** of all cases [1]. This is primarily because the antrum is the most common site for chronic *Helicobacter pylori* colonization and associated chronic atrophic gastritis, which serves as the precursor lesion for the intestinal type of gastric cancer. **2. Analysis of Incorrect Options:** * **Lesser Curvature (Option B):** While the lesser curvature (specifically the *incisura angularis*) is the most common site for **benign gastric ulcers**, it is the second most common site for malignancy (approx. 25-30%) after the antrum [1]. * **Greater Curvature (Option A):** This is a relatively rare site for primary gastric adenocarcinoma [1]. If a mass is found here, clinicians often consider differential diagnoses like Gastrointestinal Stromal Tumors (GIST) or Lymphoma. * **Fundus (Option C):** The fundus and cardia are less common than the antrum. However, it is important to note that while distal cancers are decreasing in the West, the incidence of proximal (cardia/fundal) cancers is rising due to obesity and GERD. **3. High-Yield Clinical Pearls for NEET-PG:** * **Most common histological type:** Adenocarcinoma (90-95%) [2]. * **Lauren Classification:** Divides gastric cancer into **Intestinal** (associated with *H. pylori*, bulky mass) and **Diffuse** (signet ring cells, *linitis plastica*, not associated with *H. pylori*) [1]. * **Virchow’s Node:** Left supraclavicular lymph node involvement (Troisier sign). * **Sister Mary Joseph Nodule:** Periumbilical metastasis. * **Krukenberg Tumor:** Bilateral ovarian metastasis (characteristically from the diffuse type). * **Blood Group A:** Associated with an increased risk of gastric cancer. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, p. 779. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Alimentary System Disease, pp. 354-355.

Question 65: Greater risk of transformation into carcinoma is seen in:

A. Prepyloric ulcer
B. Intestinal hyperplasia
C. Intestinal metaplasia (Correct Answer)
D. Intestinal hypertrophy

Explanation: **Explanation:** **Intestinal Metaplasia (Correct Answer):** Intestinal metaplasia is a well-recognized **pre-neoplastic lesion** of the stomach [2]. It occurs when the normal gastric mucosa (columnar epithelium) is replaced by intestinal-type epithelium containing **Goblet cells**, usually as a result of chronic mucosal injury (e.g., chronic *H. pylori* gastritis). This process follows the **Correa Pathway** of gastric carcinogenesis: *Chronic Gastritis → Atrophic Gastritis → Intestinal Metaplasia → Dysplasia → Adenocarcinoma.* [1] The presence of intestinal-type cells increases the susceptibility to DNA damage and subsequent malignant transformation into intestinal-type gastric adenocarcinoma [2]. **Analysis of Incorrect Options:** * **Prepyloric Ulcer:** Most gastric ulcers are benign. While a gastric ulcer must be biopsied to rule out malignancy, the ulcer itself is usually a result of acid-pepsin injury rather than a precursor lesion. Duodenal ulcers have virtually zero risk of malignancy. * **Intestinal Hyperplasia:** Hyperplasia refers to an increase in the number of cells. While it can occur in various tissues, it is not a standard precursor stage for gastric carcinoma compared to the specific cellular change of metaplasia. * **Intestinal Hypertrophy:** Hypertrophy is an increase in cell size. It is a physiological or pathological adaptation (e.g., in Menetrier’s disease, which has a low but specific risk) but is not the primary pathway for common gastric cancers. **High-Yield Facts for NEET-PG:** * **Type III (Incomplete) Metaplasia:** This subtype of intestinal metaplasia carries the highest risk of progressing to gastric cancer. * **H. pylori:** The most common trigger for the metaplasia-dysplasia sequence [3]. * **Lauren Classification:** Gastric cancer is divided into **Intestinal type** (associated with metaplasia) and **Diffuse type** (associated with *CDH1* mutations and Signet ring cells, usually not preceded by metaplasia) [4]. **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. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, pp. 286-287. [4] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, p. 779.

Question 66: Lymphoepithelial lesions in the gastrointestinal tract are seen in which condition?

A. Intestinal pseudo-obstruction
B. Maltoma
C. Celiac disease
D. All of the above (Correct Answer)

Explanation: **Explanation:** The term **Lymphoepithelial Lesion (LEL)** refers to the infiltration and destruction of glandular or surface epithelium by clusters of lymphocytes [1]. While classically associated with MALTomas, this histological feature is seen in several GI pathologies. 1. **MALToma (Extranodal Marginal Zone B-cell Lymphoma):** This is the most characteristic association. Neoplastic B-cells infiltrate the gastric glands, forming dense clusters that distort and eventually destroy the glandular architecture [1], [4]. This is a hallmark for diagnosing low-grade B-cell lymphomas of the GI tract. 2. **Celiac Disease:** In this autoimmune enteropathy, there is a marked increase in **intraepithelial lymphocytes (IELs)**—specifically CD8+ T-cells—within the surface epithelium of the small intestine [2]. This "lymphoepithelial" interaction is a key component of the Marsh criteria used for diagnosis [5]. 3. **Intestinal Pseudo-obstruction:** Certain forms, particularly **Paraneoplastic Visceral Neuropathy**, are characterized by lymphocytic infiltration of the myenteric plexus and surrounding intestinal wall (lymphocytic ganglionitis). These inflammatory cells can involve the overlying epithelial structures, leading to LEL-like patterns. **Clinical Pearls for NEET-PG:** * **MALToma:** Strongly associated with *H. pylori* infection; eradication of the bacteria often leads to tumor regression [4]. * **Celiac Disease:** Look for "villous atrophy, crypt hyperplasia, and increased IELs" in clinical vignettes [2], [5]. * **High-Yield:** Lymphoepithelial lesions are also a classic feature of **Sjögren’s Syndrome** (in salivary glands) and **Hashimoto’s Thyroiditis** [3]. **Conclusion:** Since all three conditions involve the pathological infiltration of epithelium by lymphocytes, **Option D** is the correct answer. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, p. 781. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, pp. 789-790. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Diseases of the Immune System, pp. 235-236. [4] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Alimentary System Disease, pp. 356-357. [5] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Alimentary System Disease, pp. 352-353.

Question 67: Barrett's esophagus can result from which of the following conditions?

A. Helicobacter pylori infection
B. Herpes simplex infection
C. Gastroesophageal reflux (Correct Answer)
D. Esophageal varices

Explanation: **Explanation:** **Barrett’s Esophagus** is a condition characterized by **intestinal metaplasia**, where the normal stratified squamous epithelium of the lower esophagus is replaced by simple columnar epithelium with **goblet cells** [1]. 1. **Why Gastroesophageal Reflux (GERD) is correct:** Chronic exposure to gastric acid and bile (as seen in long-standing GERD) causes repeated mucosal injury [3]. To adapt to this acidic environment, the esophageal stem cells undergo metaplasia, shifting from squamous to a more acid-resistant columnar phenotype [1]. This is a classic example of a protective but premalignant adaptation. 2. **Why the other options are incorrect:** * **Helicobacter pylori:** This bacterium is primarily associated with chronic gastritis, peptic ulcer disease, and gastric MALT lymphoma. Interestingly, some studies suggest *H. pylori* may actually have a protective effect against GERD and Barrett’s by reducing gastric acidity. * **Herpes simplex infection:** HSV typically causes acute "punched-out" ulcers (Herpetic Esophagitis) in immunocompromised patients, but it does not lead to metaplastic changes. * **Esophageal varices:** These are dilated submucosal veins caused by portal hypertension (usually secondary to liver cirrhosis). They present with hematemesis, not epithelial metaplasia. **High-Yield Pearls for NEET-PG:** * **Hallmark Histology:** Presence of **Goblet cells** is essential for the diagnosis of Barrett’s Esophagus [1]. * **Endoscopy:** Appears as "salmon-pink" velvety tongues of mucosa extending upward from the gastroesophageal junction [2]. * **Risk:** It is the single most important precursor for **Esophageal Adenocarcinoma** (increasing risk by 30-100 fold) [1]. * **Molecular Marker:** Overexpression of **TP53** and **p16** are often seen in the progression to dysplasia. **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. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, pp. 762-763.

Question 68: A 50-year-old male presents with obstructive symptoms. Biopsy of the stomach reveals a Gastrointestinal stromal tumor (GIST). Which is the most appropriate immunohistochemical marker for GIST?

A. CD 34
B. CD 117 (Correct Answer)
C. CD 30
D. CD 10

Explanation: **Explanation:** **Gastrointestinal Stromal Tumor (GIST)** is the most common mesenchymal tumor of the gastrointestinal tract, most frequently occurring in the stomach. These tumors originate from the **Interstitial Cells of Cajal (ICC)**, which serve as the GI pacemaker cells. **1. Why CD 117 is the Correct Answer:** The hallmark of GIST is the mutation in the **c-KIT proto-oncogene**, which encodes a transmembrane tyrosine kinase receptor. **CD 117** is the immunohistochemical (IHC) marker for the c-KIT protein. Approximately 95% of GISTs are positive for CD 117, making it the "gold standard" for diagnosis. Another highly sensitive and specific marker often used alongside CD 117 is **DOG1** (Discovered On GIST 1). **2. Analysis of Incorrect Options:** * **CD 34:** While positive in about 60-70% of GISTs, it is non-specific as it also marks vascular tumors and solitary fibrous tumors. * **CD 30:** This is a marker for Reed-Sternberg cells in Hodgkin Lymphoma and Anaplastic Large Cell Lymphoma (ALCL). * **CD 10:** Also known as CALLA, it is primarily used to identify Acute Lymphoblastic Leukemia (ALL) and certain renal/endometrial tumors. **3. High-Yield Clinical Pearls for NEET-PG:** * **Genetic Mutation:** Most common is **c-KIT**; if c-KIT is negative, look for **PDGFRA** (Platelet-Derived Growth Factor Receptor Alpha) mutations [1]. * **Histology:** Can show spindle cell (most common) or epithelioid morphology. * **Treatment:** The targeted therapy of choice is **Imatinib** (a tyrosine kinase inhibitor) [1]. * **Carney Triad:** GIST, Pulmonary Chondroma, and Paraganglioma. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, pp. 782-783.

Question 69: An endoscopic biopsy from a case of H. pylori related duodenal ulcer is most likely to reveal what histological finding?

A. Antral predominant gastritis (Correct Answer)
B. Multifocal atrophic gastritis
C. Acute erosive gastritis
D. Gastric atrophy

Explanation: ### Explanation **Correct Answer: A. Antral predominant gastritis** **1. Why Antral Predominant Gastritis is Correct:** *Helicobacter pylori* infection typically presents in two distinct patterns [1]. In patients who develop **duodenal ulcers**, the infection is localized primarily to the **antrum** (Antral predominant gastritis) [3]. * **Mechanism:** The localized inflammation in the antrum leads to a decrease in **Somatostatin** (from D-cells) and a subsequent increase in **Gastrin** (from G-cells) [4]. This hypergastrinemia stimulates parietal cells in the body of the stomach to secrete excessive acid. * **Outcome:** The high acid load enters the duodenum, causing gastric metaplasia of the duodenal mucosa, which *H. pylori* then colonizes, leading to a duodenal ulcer [2]. **2. Why Other Options are Incorrect:** * **B. Multifocal Atrophic Gastritis:** This pattern involves both the antrum and the body. It is associated with reduced acid secretion (hypochlorhydria) and carries a high risk of progression to **Gastric Adenocarcinoma**, rather than duodenal ulcers. * **C. Acute Erosive Gastritis:** This is typically caused by NSAIDs, alcohol, or severe stress (Curling/Cushing ulcers). It is characterized by superficial mucosal damage and neutrophilic infiltration, not the chronic colonization pattern of *H. pylori* leading to duodenal ulcers [2]. * **D. Gastric Atrophy:** This is a late-stage consequence of chronic gastritis (often autoimmune or long-standing *H. pylori*). It results in the loss of glandular structures and is associated with gastric ulcers or cancer, not duodenal ulcers. **3. Clinical Pearls for NEET-PG:** * **Most common site for *H. pylori* colonization:** Antrum [3]. * **Stains for *H. pylori*:** Warthin-Starry (Silver) stain (Best), Giemsa, and Genta stain [1]. * **Urease Breath Test:** Based on the organism's ability to produce urease, converting urea to CO₂ and ammonia. * **Duodenal Ulcer vs. Gastric Ulcer:** Duodenal ulcers are more common and are almost always (95%) associated with *H. pylori* [2]. Gastric ulcers have a lower association (~70%). **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, p. 771. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Alimentary System Disease, pp. 353-354. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, pp. 770-771. [4] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Alimentary System Disease, pp. 350-351.

Question 70: The characteristic mucosal appearance in Crohn's disease is described as:

A. Thumb printing
B. Tree branching
C. Cobblestoning (Correct Answer)
D. Patchy necrosis

Explanation: **Explanation:** **Crohn’s Disease** is a chronic, transmural inflammatory bowel disease that can affect any part of the GIT [1]. The characteristic **"Cobblestone appearance"** occurs due to the intersection of deep, elongated **linear (serpiginous) ulcerations** with islands of relatively spared, **edematous mucosa** [2]. This creates an irregular, bumpy surface resembling a cobblestone street. **Analysis of Options:** * **A. Thumb printing:** This is a classic radiologic sign seen on abdominal X-rays or CT scans, representing **focal mucosal edema** and submucosal hemorrhage. It is most characteristic of **Ischemic Colitis**, not Crohn’s. * **B. Tree branching:** This is not a standard pathological descriptor for mucosal surfaces in IBD. It may occasionally refer to vascular patterns in radiology or certain polypoid growth patterns, but it is not diagnostic of Crohn’s. * **C. Cobblestoning (Correct):** As described, this results from transmural inflammation and fissuring ulcers surrounding islands of intact mucosa [1]. * **D. Patchy necrosis:** While Crohn’s features "skip lesions," the primary pathology is granulomatous inflammation and ulceration [1]. Extensive patchy necrosis is more suggestive of **Necrotizing Enterocolitis (NEC)** or severe mesenteric ischemia. **High-Yield NEET-PG Pearls:** * **Skip Lesions:** Areas of disease separated by normal-appearing "skip" segments (unlike the continuous involvement in Ulcerative Colitis) [2]. * **Transmural Inflammation:** Leads to complications like **fistulas**, strictures (String sign of Kantor), and "creeping fat" [1]. * **Microscopy:** Presence of **Non-caseating granulomas** (seen in 40-60% of cases) is a hallmark [3]. * **Location:** Most common site is the **terminal ileum** [1]. **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.

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