Gastrointestinal Pathology Practice Questions

Q: Tobacco usage has been associated with which of the following oral pathological changes?

Hyperkeratosis. **Explanation:** The correct answer is **Hyperkeratosis**. **Why Hyperkeratosis is correct:** Tobacco contains various chemical irritants and carcinogens (such as polycyclic aromatic hydrocarbons and nitrosamines). Chronic exposure to these irritants triggers a protective physiological response in the oral mucosa. To shield the underlying delicate epithelium, the body increases the production of keratin, leading to thickening of the *stratum corneum*. This process is known as **hyperkeratosis**. Clinically, this often manifests as **Leukoplakia**—a white, non-scrapable patch that is considered a classic premalignant lesion associated with tobacco use. **Why other options are incorrect:** * **Erythema:** While tobacco can cause inflammation, erythema (redness) is more characteristic of *Erythroplakia*. While serious, the primary and most common structural change induced by the irritants in tobacco is the protective thickening (keratosis) rather than simple vascular congestion. * **Ulceration:** Ulceration is typically a sign of malignancy (Squamous Cell Carcinoma) or acute trauma. Tobacco itself causes chronic proliferative changes (hyperplasia/keratosis) rather than acute loss of epithelial continuity (ulceration). **High-Yield NEET-PG Pearls:** * **Leukoplakia:** The most common precancerous lesion of the oral cavity. The risk of malignant transformation is higher in the "non-homogeneous" (speckled) variety. * **Smoker’s Palate (Stomatitis Nicotina):** Characterized by a diffuse white palate with red dots, which represent the inflamed openings of minor salivary glands. * **Site Predilection:** Tobacco chewing is most strongly associated with carcinoma of the **buccal mucosa** (often called the "Indian Oral Cancer"). * **Histology:** Look for "epithelial dysplasia" in biopsy reports of tobacco-related lesions to assess the risk of malignancy.

Q: Which of the following conditions is most likely depicted in the image?

Crohn's disease. ***Crohn's disease*** - Classic **cobblestone mucosa** appearance with **skip lesions** (discontinuous inflammation) and **transmural involvement** extending through all bowel wall layers - **Rectal sparing** is typical, and **Kantor's string sign** may be seen on barium enema due to stricturing and narrowing *Carcinoma of the colon* - Presents with **apple-core lesion** on imaging, showing circumferential narrowing with overhanging edges - **Mass effect** with obstruction rather than inflammatory changes, and lacks the cobblestone pattern *Ulcerative colitis* - Shows **continuous inflammation** starting from rectum and extending proximally without skip lesions - **Superficial mucosal involvement** only, with **rectal involvement** always present, unlike the transmural changes seen here *Tuberculosis* - Typically affects **ileocaecal region** with **Stierlin's sign** (rapid emptying of terminal ileum on barium studies) - **Caseating granulomas** and **acid-fast bacilli** on histology, often with systemic symptoms like fever and weight loss

Q: Helicobacter pylori is known to cause all of the following except?

Fundal gastritis. **Explanation:** *Helicobacter pylori* is a gram-negative, microaerophilic, spiral-shaped bacterium that primarily colonizes the stomach. The key to answering this question lies in understanding the **topographical distribution** of *H. pylori* infection. **Why "Fundal Gastritis" is the correct answer:** *H. pylori* typically colonizes the **Antrum** of the stomach (Antral gastritis) because the acid-secreting parietal cells in the Fundus and Body create an environment less favorable for initial colonization. While chronic infection can eventually spread to the body (pangastritis), isolated or primary **Fundal gastritis** is characteristic of **Autoimmune Gastritis** (Type A), not *H. pylori* (Type B). **Analysis of Incorrect Options:** * **Gastric & Duodenal Ulcers:** *H. pylori* is the most common cause of peptic ulcer disease. It causes duodenal ulcers by increasing gastrin secretion (due to antral involvement) and gastric ulcers by damaging the mucosal protective barrier. * **Gastric Lymphoma:** Chronic *H. pylori* infection leads to the formation of Mucosa-Associated Lymphoid Tissue (MALT). It is a definitive risk factor for **MALToma** (B-cell lymphoma). Notably, early-stage MALToma can often be cured by eradicating *H. pylori*. **High-Yield Clinical Pearls for NEET-PG:** * **Type A Gastritis:** **A**utoimmune, involves the **A**ndus (Fundus/Body), associated with **A**pernicious anemia. * **Type B Gastritis:** **B**acterial (*H. pylori*), involves the **B**antrum (Antrum). * **Virulence Factors:** **Urease** (neutralizes acid), **CagA** (immunogenic/oncogenic), and **VacA** (cytotoxin). * **Diagnosis:** **Urea Breath Test** is the gold standard for non-invasive screening and confirming eradication. **Endoscopic biopsy** with a Rapid Urease Test (RUT) is the invasive test of choice.

Question 1

In which one of the following salivary gland tumors, the tumor is composed of "intermediate cells" histologically?

Accepted Answer

Mucoepidermoid carcinoma

Answer

Adenoid cystic carcinoma

Answer

Pleomorphic adenoma

Answer

Warthin's tumour

Question 2

Which of the following is NOT true about solitary rectal ulcer syndrome?

Accepted Answer

Lamina propria infiltration with lymphocytes

Answer

Increased muscle layer proliferation

Answer

Crypt distortion

Answer

Subepithelial fibrosis

Question 3

Tobacco usage has been associated with which of the following oral pathological changes?

Accepted Answer

Hyperkeratosis

Answer

Erythema

Answer

Ulceration

Answer

None of the above

Question 4

A 63-year-old man undergoes a screening colonoscopy and is found to have a polyp in his sigmoid colon. Which type of polyp is most associated with malignancy?

Accepted Answer

Villous adenoma

Answer

Tubular adenoma

Answer

Tubulovillous adenoma

Answer

1 cm polyp

Question 5

Zollinger-Ellison syndrome is not caused by tumors from which of the following organs?

Accepted Answer

Colon

Answer

Pancreas

Answer

Ovary

Answer

Duodenum

Question 6

Which of the following conditions is most likely depicted in the image?

Accepted Answer

Crohn's disease

Answer

Carcinoma of the colon

Answer

Ulcerative colitis

Answer

Tuberculosis

Question 7

In which of the following conditions is acquired (secondary) megacolon seen?

Accepted Answer

Rectal malignancy

Answer

Fissure in-ano

Answer

Complete absence of parasympathetic ganglion cells

Answer

Absence of sympathetic ganglion cells

Question 8

All are true regarding foregut carcinoid tumors, except?

Accepted Answer

Bone metastasis is not a feature.

Answer

Foregut tumors generally have a low serotonin content.

Answer

Argentaffin-negative but argyrophilic.

Answer

Often multifactorial.

Question 9

Stress-induced ulcers are most commonly found in which part of the gastrointestinal tract?

Accepted Answer

Fundus of stomach

Answer

Antrum of stomach

Answer

Pyloric channel

Answer

First part of duodenum

Question 10

Helicobacter pylori is known to cause all of the following except?

Accepted Answer

Fundal gastritis

Answer

Gastric ulcer

Answer

Duodenal ulcer

Answer

Gastric lymphoma

Gastrointestinal Pathology — MCQs

Gastrointestinal Pathology — MCQs

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