Gastrointestinal Pathology — MCQs

An epidemiologic study of children aged 1 to 3 years with failure to thrive is undertaken in Guatemala. Some of these children have repeated bouts of diarrhea and do not improve with dietary supplements. Jejunal biopsies show blunted, atrophic villi with crypt elongation and chronic inflammatory infiltrates. What is the most likely factor contributing to recurrent diarrhea in these children?

Q339Medium

Which of the following statements regarding Barrett's esophagus is true?

Q340Easy

What is the most common benign mesenchymal tumor of the stomach?

Gastrointestinal Pathology Indian Medical PG Practice Questions and MCQs

Question 331: Which of the following is an autoimmune gastric disease?

A. Type A gastritis (Correct Answer)
B. Type B gastritis
C. Atrophic gastritis
D. Erosive gastritis

Explanation: **Explanation:** **Type A Gastritis** is the correct answer because it is a classic **autoimmune** condition [1], [2]. It is characterized by the production of autoantibodies against **parietal cells** and **intrinsic factor** [1], [3]. This immune-mediated destruction occurs primarily in the **body and fundus** of the stomach (sparing the antrum) [2]. The loss of parietal cells leads to achlorhydria (decreased acid) and hypergastrinemia, while the loss of intrinsic factor results in Vitamin B12 deficiency (**Pernicious Anemia**) [1], [2]. **Analysis of Incorrect Options:** * **Type B Gastritis:** This is the most common form of chronic gastritis and is caused by **infection** with *Helicobacter pylori* [2]. It typically involves the **antrum** first [2]. * **Atrophic Gastritis:** This is a morphological description of chronic inflammation leading to mucosal thinning and loss of glands [1]. While Type A leads to atrophy, "atrophic gastritis" is a general term that can be caused by either autoimmune (Type A) or environmental/H. pylori (Type B) factors. * **Erosive Gastritis:** This is an **acute** condition usually caused by mucosal insults such as NSAIDs, alcohol, or severe stress (e.g., Curling or Cushing ulcers), rather than an autoimmune process. **High-Yield Clinical Pearls for NEET-PG:** * **Mnemonic:** **A**utoimmune = Type **A** = **A**ntrum sparing / **A**chlorhydria / **A**nemia (Pernicious). * **Location:** Type A affects the **Body/Fundus**; Type B affects the **Antrum** [2]. * **Complications:** Type A gastritis significantly increases the risk of **Gastric Adenocarcinoma** and **Carcinoid tumors** (due to G-cell hyperplasia and hypergastrinemia) [2]. * **Serology:** Look for Anti-parietal cell and Anti-intrinsic factor antibodies in clinical vignettes [1], [3]. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Blood And Bone Marrow Disease, pp. 592-593. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, pp. 771-773. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Red Blood Cell and Bleeding Disorders, pp. 655-656.

Question 332: Barrett's esophagus can lead to which of the following complications?

A. Stricture (Correct Answer)
B. Reflux esophagitis
C. Peptic ulcer
D. Achalasia

Explanation: **Explanation:** **Barrett’s Esophagus (BE)** is a complication of chronic Gastroesophageal Reflux Disease (GERD) characterized by intestinal metaplasia, where the normal stratified squamous epithelium is replaced by non-ciliated columnar epithelium with goblet cells [1, 2]. **Why Stricture is Correct:** Chronic inflammation and ulceration associated with Barrett’s esophagus lead to the deposition of fibrous tissue in the submucosa. Over time, this **fibrosis and scarring** result in the narrowing of the esophageal lumen, known as a **peptic stricture**. Patients typically present with progressive dysphagia (difficulty swallowing). **Analysis of Incorrect Options:** * **Reflux Esophagitis:** This is the *precursor* or cause of Barrett’s esophagus, not a complication of it. BE is a protective (though maladaptive) response to the injury caused by reflux [2]. * **Peptic Ulcer:** While "Barrett’s ulcers" can occur within the metaplastic segment, the term "Peptic ulcer" generally refers to gastric or duodenal ulcers. In the esophagus, the primary structural complication is the resulting stricture. * **Achalasia:** This is a primary motility disorder caused by the loss of ganglion cells in the myenteric plexus. It is unrelated to the metaplastic changes of Barrett’s. **NEET-PG High-Yield Pearls:** * **Definition:** Metaplasia must show **Goblet cells** on histology (Gold Standard) [1, 2]. * **Most Serious Complication:** Esophageal **Adenocarcinoma** (BE increases risk by 30-100 fold) [1, 2]. * **Endoscopy:** Appears as "salmon-pink" velvety tongues of mucosa extending above the gastroesophageal junction [1]. * **Screening:** Periodic endoscopy with biopsies is required to monitor for dysplasia [1, 2]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, pp. 764-766. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Alimentary System Disease, pp. 348-349.

Question 333: In Barrett's esophagus, what type of lining is present?

A. Squamous cell epithelium
B. Transitional cell epithelium
C. Secreting columnar cell epithelium (Correct Answer)
D. None of the above

Explanation: **Explanation:** **Barrett’s Esophagus** is a classic example of **metaplasia**, where the normal stratified squamous epithelium of the lower esophagus is replaced by **columnar epithelium** containing goblet cells [1]. This occurs as an adaptive response to chronic injury caused by Gastroesophageal Reflux Disease (GERD) [1]. 1. **Why Option C is Correct:** The hallmark of Barrett’s esophagus is **intestinal metaplasia** [1]. The replacement tissue consists of secreting columnar cells, specifically **goblet cells** (which secrete mucin) [1]. This columnar lining is more resistant to the corrosive effects of gastric acid and pepsin than the original squamous lining [1]. 2. **Why Option A is Incorrect:** Squamous cell epithelium is the **normal** lining of the esophagus. In Barrett’s, this is the tissue that is *replaced*, not the resulting pathology. 3. **Why Option B is Incorrect:** Transitional epithelium (urothelium) is characteristic of the urinary tract (e.g., bladder, ureters). It is not involved in esophageal pathology. **High-Yield Clinical Pearls for NEET-PG:** * **Definition:** Barrett’s is defined by the presence of intestinal metaplasia (goblet cells) at least 1 cm proximal to the gastroesophageal junction. * **Diagnosis:** Endoscopy shows "salmon-pink" velvety tongues of mucosa; however, **histopathology** (biopsy) is the gold standard to confirm goblet cells [1]. * **Stain:** **Alcian Blue** stain at pH 2.5 is used to highlight the acidic mucin in goblet cells. * **Complication:** It is a significant **pre-malignant** condition, increasing the risk of **Esophageal Adenocarcinoma** (not squamous cell carcinoma) [1]. * **Molecular Marker:** Increased expression of **CDX2** is often seen in the metaplastic process. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Alimentary System Disease, pp. 348-349.

Question 334: Small punched-out lesions on endoscopy in the lower esophagus are seen in which of the following conditions in immunocompromised patients?

A. CMV esophagitis
B. Candida esophagitis
C. Corrosive esophagitis
D. Herpes simplex esophagitis (Correct Answer)

Explanation: **Explanation:** The correct answer is **Herpes simplex esophagitis (HSV)**. In immunocompromised patients, HSV-1 typically causes acute inflammation of the esophageal mucosa [1], manifesting endoscopically as **small, discrete, "punched-out" ulcers**. These are often referred to as "volcano ulcers" because they are well-circumscribed with a rim of edema. **Why the other options are incorrect:** * **CMV esophagitis:** Characteristically presents with **large, shallow, linear, or longitudinal ulcerations**, rather than small punched-out ones [1]. On histology, it shows "owl’s eye" intranuclear inclusions. * **Candida esophagitis:** The most common infectious esophagitis, it presents as **adherent, white, curd-like plaques** (pseudomembranes) on an erythematous base, not discrete ulcers [1], [2]. * **Corrosive esophagitis:** This is caused by the ingestion of strong acids or alkalis [1]. It results in diffuse mucosal edema, sloughing, and deep circumferential necrosis, rather than focal punched-out lesions. **High-Yield Clinical Pearls for NEET-PG:** * **HSV Histology:** Look for **Cowdry Type A** intranuclear inclusions and multinucleated giant cells (syncytia) showing "3 Ms": **M**argination of chromatin, **M**ultinucleation, and **M**olding of nuclei. * **Biopsy Site:** For HSV, biopsy the **edge** of the ulcer (where the virus replicates in epithelial cells). For CMV, biopsy the **base** of the ulcer (as the virus infects endothelial cells and fibroblasts). * **Odynophagia:** Severe pain on swallowing is the hallmark clinical symptom of infectious esophagitis [2]. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Alimentary System Disease, pp. 347-348. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Infectious Diseases, pp. 394-395.

Question 335: What is the most common cause of Pseudomyxoma Peritonei?

A. Mucinous tumour of the appendix (Correct Answer)
B. Ovarian tumour
C. Colorectal carcinoma
D. None of the above

Explanation: **Explanation:** **Pseudomyxoma Peritonei (PMP)** is a clinical syndrome characterized by the accumulation of abundant "gelatinous" or mucinous ascites within the peritoneal cavity. **Why Option A is Correct:** The vast majority of PMP cases (over 90%) originate from a **mucinous neoplasm of the appendix** (most commonly a Low-grade Appendiceal Mucinous Neoplasm - LAMN) [2]. When the appendix ruptures, neoplastic mucin-secreting cells are released into the peritoneum. These cells implant on peritoneal surfaces and continue to produce large volumes of extracellular mucin, leading to the characteristic "jelly belly" appearance [2]. **Why Other Options are Incorrect:** * **Option B (Ovarian Tumour):** Historically, the ovary was thought to be a primary site. However, modern immunohistochemistry (CK20+, CK7-, CDX2+) has proven that most mucinous tumors involving both the appendix and ovary are actually **metastatic from the appendix** [1]. Primary ovarian mucinous tumors rarely cause PMP [3]. * **Option C (Colorectal Carcinoma):** While colorectal cancers can produce mucin and metastasize to the peritoneum, they typically present as solid peritoneal carcinomatosis rather than the diffuse, gelatinous PMP syndrome. **NEET-PG High-Yield Pearls:** * **Clinical Sign:** "Jelly Belly" (distended abdomen filled with mucin). * **Redistribution Phenomenon:** Mucin and cells accumulate at specific sites of peritoneal fluid resorption (e.g., omentum, undersurface of the diaphragm) while sparing the mobile small bowel loops. * **Treatment:** The current gold standard is **Cytoreductive Surgery (CRS)** combined with **Hyperthermic Intraperitoneal Chemotherapy (HIPEC)**. * **Marker:** CEA and CA-19-9 are often elevated and used for monitoring recurrence. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Female Genital Tract Disease, pp. 478-480. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, pp. 823-824. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Female Genital Tract, pp. 1030-1032.

Question 336: Which of the following is NOT a characteristic of Gardner's syndrome?

A. Protein losing enteropathy
B. Diagnosis always occurs in the 5th decade of life (Correct Answer)
C. Presence of polyps in the small intestine
D. Malignancy is common

Explanation: Gardner’s syndrome is a phenotypic variant of **Familial Adenomatous Polyposis (FAP)**, inherited in an autosomal dominant fashion due to mutations in the **APC gene** on chromosome 5q21 [1]. **Why Option B is the correct answer:** The statement that diagnosis "always occurs in the 5th decade" is incorrect. In Gardner’s syndrome (and FAP), colonic polyps typically begin to develop in the **teens or early 20s**. If left untreated, the risk of progression to colorectal carcinoma is nearly **100% by age 40** [1]. Therefore, diagnosis and prophylactic colectomy usually occur much earlier than the 5th decade. **Analysis of other options:** * **Option A (Protein losing enteropathy):** Extensive intestinal polyposis can lead to significant protein loss through the gut mucosa, resulting in hypoalbuminemia and edema. * **Option C (Presence of polyps in the small intestine):** While colonic polyps are hallmark, patients frequently develop extracolonic polyps, most commonly in the **duodenum** (periampullary region) and stomach. * **Option D (Malignancy is common):** Due to the "two-hit hypothesis" affecting the APC tumor suppressor gene, malignant transformation of polyps is inevitable without surgical intervention [1]. **High-Yield Clinical Pearls for NEET-PG:** * **The Triad of Gardner’s Syndrome:** 1. Colonic Polyposis, 2. Osteomas (especially of the mandible/skull), and 3. Soft tissue tumors (Desmoid tumors, sebaceous cysts, fibromas). * **Turcot Syndrome:** Association of FAP with CNS tumors (Medulloblastoma) or Lynch syndrome with Gliomas. * **Dental abnormalities:** Impacted teeth or supernumerary teeth are common in Gardner’s. * **CHRPE:** Congenital Hypertrophy of Retinal Pigment Epithelium is a highly specific screening marker for FAP/Gardner’s. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, pp. 821-822.

Question 337: Which of the following is an epithelial tumor of the stomach?

A. Gastrointestinal Stromal Tumor (GIST)
B. Carcinoid tumor (Correct Answer)
C. Sarcoma
D. Granular cell tumor

Explanation: **Explanation:** The classification of gastric tumors is based on the tissue of origin. **Epithelial tumors** arise from the cells lining the gastric mucosa or the specialized glandular cells within it. **Why Carcinoid Tumor is Correct:** Carcinoid tumors (Neuroendocrine Tumors/NETs) arise from **enterochromaffin-like (ECL) cells**, which are specialized neuroendocrine cells located within the gastric epithelium [1]. Since these cells are part of the epithelial lining, carcinoids are classified as epithelial neoplasms. In the stomach, they are often associated with hypergastrinemia (Type I) or MEN-1/Zollinger-Ellison Syndrome (Type II). **Analysis of Incorrect Options:** * **Gastrointestinal Stromal Tumor (GIST):** This is a **mesenchymal** tumor, not epithelial. It arises from the **Interstitial Cells of Cajal (ICC)**, which are the "pacemaker" cells located in the muscularis propria. * **Sarcoma:** These are malignant tumors of **mesenchymal origin** (e.g., leiomyosarcoma from smooth muscle or angiosarcoma from blood vessels). * **Granular Cell Tumor:** These are rare, usually benign tumors of **neural origin** (derived from Schwann cells), making them non-epithelial. **NEET-PG High-Yield Pearls:** * **Most common gastric malignancy:** Adenocarcinoma (Epithelial). * **GIST Marker:** Characterized by the expression of **CD117 (c-KIT)** and **DOG1**. * **Carcinoid Marker:** Diagnosed using immunohistochemistry for **Chromogranin A** and **Synaptophysin**. * **Type I Gastric Carcinoid:** Most common type; associated with Chronic Autoimmune Atrophic Gastritis and achlorhydria. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, pp. 780-781.

Question 338: An epidemiologic study of children aged 1 to 3 years with failure to thrive is undertaken in Guatemala. Some of these children have repeated bouts of diarrhea and do not improve with dietary supplements. Jejunal biopsies show blunted, atrophic villi with crypt elongation and chronic inflammatory infiltrates. What is the most likely factor contributing to recurrent diarrhea in these children?

A. Abetalipoproteinemia
B. Bacterial infection (Correct Answer)
C. Chloride ion channel dysfunction
D. Disaccharidase deficiency

Explanation: **Explanation:** The clinical presentation and histopathology described are characteristic of **Environmental Enteric Dysfunction (EED)**, formerly known as tropical sprue [1]. This condition is prevalent in low-resource settings with poor sanitation (like parts of Guatemala) [1]. **1. Why Bacterial Infection is Correct:** The core mechanism of EED is **recurrent exposure to fecal-oral pathogens** (bacteria like *E. coli*, *Campylobacter*, and parasites). Even in the absence of acute symptoms, constant exposure leads to chronic intestinal inflammation. This results in the classic triad seen on biopsy: **villous blunting/atrophy** (reducing surface area), **crypt hyperplasia** (attempted regeneration), and **increased intraepithelial lymphocytes**. This malabsorptive state causes failure to thrive and persistent diarrhea that does not resolve with simple dietary supplementation [1]. **2. Why the Other Options are Incorrect:** * **Abetalipoproteinemia:** A rare genetic disorder characterized by an inability to synthesize Apolipoprotein B. While it causes malabsorption, biopsies show **lipid-laden vacuolated enterocytes** (clear cytoplasm) rather than inflammatory villous atrophy. * **Chloride ion channel dysfunction:** This refers to **Cystic Fibrosis**. While it causes malabsorption due to pancreatic insufficiency, the intestinal mucosa remains histologically normal. * **Disaccharidase deficiency:** (e.g., Lactose intolerance) This causes osmotic diarrhea. The intestinal biopsy in primary disaccharidase deficiency is typically **unremarkable** (normal villi). **Clinical Pearls for NEET-PG:** * **EED vs. Celiac Disease:** Both show villous atrophy and crypt hyperplasia. However, EED is linked to poor sanitation/infection, whereas Celiac is an autoimmune response to gluten (HLA-DQ2/DQ8) [1]. * **Key Histology:** Villous-to-crypt ratio decreases from the normal 3:1 or 4:1. * **Management:** Improving sanitation and clean water access is more effective than nutritional supplements alone in these populations. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, pp. 790-798.

Question 339: Which of the following statements regarding Barrett's esophagus is true?

A. Endoscopic surveillance with biopsy every 2 years is recommended. (Correct Answer)
B. Helicobacter pylori triple therapy is the primary treatment.
C. Proton pump inhibitors are considered a cure.
D. Histamine antagonists are sufficient for management.

Explanation: **Explanation:** **Barrett’s Esophagus (BE)** is a condition where the normal stratified squamous epithelium of the lower esophagus is replaced by simple columnar epithelium with goblet cells (**intestinal metaplasia**) due to chronic gastroesophageal reflux disease (GERD) [1], [2]. 1. **Why Option A is Correct:** The primary clinical significance of BE is its status as a **pre-malignant condition**, increasing the risk of **Esophageal Adenocarcinoma** [2]. Management focuses on detecting dysplasia early. Standard guidelines (like ACG) recommend endoscopic surveillance with biopsies (Seattle protocol) every **3 to 5 years** for non-dysplastic BE. However, in the context of NEET-PG and standard pathology textbooks, periodic surveillance (often cited as every 2–3 years depending on the degree of dysplasia) is the cornerstone of management to prevent progression to malignancy [1], [2]. 2. **Why Other Options are Incorrect:** * **Option B:** *H. pylori* triple therapy is for peptic ulcer disease. Interestingly, *H. pylori* infection is actually associated with a *decreased* risk of BE because it causes gastric atrophy, reducing acid production. * **Option C & D:** While Proton Pump Inhibitors (PPIs) and H2 blockers manage symptoms and promote healing of esophagitis, they **do not "cure" or reverse** the metaplastic changes of Barrett’s Esophagus. **High-Yield Clinical Pearls for NEET-PG:** * **Definition:** Intestinal metaplasia (presence of **Goblet cells**) is the histological hallmark [2]. * **Gross Appearance:** "Salmon-pink" velvety tongues of mucosa extending upwards from the GE junction. * **Risk Factor:** Long-standing GERD; most common in Caucasian males over 50. * **Molecular Marker:** Progression to adenocarcinoma is often associated with **p53 mutations**. * **Treatment of Dysplasia:** High-grade dysplasia is managed with endoscopic mucosal resection (EMR) or radiofrequency ablation [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, pp. 764-766. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Alimentary System Disease, pp. 348-349.

Question 340: What is the most common benign mesenchymal tumor of the stomach?

A. Polypoid adenoma
B. Leiomyoma (Correct Answer)
C. Glomus tumor
D. Lipoma

Explanation: **Explanation:** The stomach can host various mesenchymal (non-epithelial) tumors. Among these, **Leiomyoma** is the most common benign mesenchymal tumor of the stomach [1]. These are slow-growing, smooth muscle tumors typically arising from the *muscularis propria* or *muscularis mucosae*. While Gastrointestinal Stromal Tumors (GIST) are the most common mesenchymal tumors of the GI tract overall, they are often considered "potentially malignant" [3]. When specifically categorizing strictly **benign** mesenchymal lesions, leiomyomas (especially small, asymptomatic ones) are frequently encountered in the stomach [1]. **Analysis of Options:** * **A. Polypoid adenoma:** This is an **epithelial** tumor, not a mesenchymal one [1]. It is a precursor to gastric adenocarcinoma. * **C. Glomus tumor:** This is a rare mesenchymal tumor arising from the glomus body (perivascular temperature-regulating structures). In the stomach, it typically presents as a subepithelial antral lesion but is much less common than leiomyoma. * **D. Lipoma:** These are benign fatty tumors. While they occur in the stomach (usually in the submucosa), they are significantly less common than smooth muscle tumors [2]. **High-Yield Clinical Pearls for NEET-PG:** * **GIST vs. Leiomyoma:** GIST is the most common mesenchymal tumor of the *entire* GI tract. GISTs are **CD117 (c-KIT)** and **DOG-1** positive [3], whereas Leiomyomas are **Desmin** and **SMA** positive. * **Location:** The stomach is the most common site for GISTs (60%) [3], but true leiomyomas are more frequently found in the **esophagus**. * **Morphology:** On endoscopy, these appear as firm, well-circumscribed subepithelial nodules with intact overlying mucosa. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Alimentary System Disease, pp. 354-355. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Bones, Joints, and Soft Tissue Tumors, p. 1222. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, pp. 782-783.

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