Gastrointestinal Pathology Practice Questions

Q: Ulceration of Peyer's patches occurs in which infection?

Salmonella infection. **Explanation:** The correct answer is **Salmonella infection (Typhoid fever)**. **Salmonella typhi** and **paratyphi** have a specific tropism for lymphoid tissue. After ingestion, the bacteria invade the intestinal mucosa and proliferate within the **Peyer’s patches** (lymphoid follicles) of the terminal ileum [1]. This leads to marked hyperplasia, followed by necrosis and sloughing of the overlying mucosa, resulting in characteristic **longitudinal ulcers** that follow the long axis of the bowel. This is a high-yield distinction from other types of intestinal ulceration. **Why other options are incorrect:** * **Amoebiasis (Entamoeba histolytica):** Typically causes **"flask-shaped" ulcers** with narrow necks and broad bases. These ulcers are usually found in the colon (cecum and rectosigmoid) rather than Peyer's patches. * **Crohn’s disease:** Characterized by **transmural inflammation**, "aphthous" ulcers that progress to **"cobblestone" appearance**, and non-caseating granulomas. It is not specifically localized to lymphoid follicles. * **Clostridium difficile:** Causes **Pseudomembranous colitis**. It is characterized by "volcano-like" eruptions of purulent exudate (fibrin, mucus, and neutrophils) forming a yellow-green membrane over the colonic mucosa, rather than discrete ulceration of Peyer's patches. **NEET-PG High-Yield Pearls:** * **Typhoid Ulcers:** Longitudinal, located in the ileum; risk of perforation is highest in the 3rd week [1]. * **Tubercular Ulcers:** Transverse (circumferential) due to spread via lymphatics. * **Widal Test:** Measures antibodies against O and H antigens; usually becomes positive in the 2nd week of Typhoid fever. * **Microscopy:** Look for **"Typhoid cells"** (erythrophagocytic macrophages) in the liver, spleen, and bone marrow [1]. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Alimentary System Disease, pp. 362-363.

Q: Linitis plastica is described as:

A diffuse gastric carcinoma. **Explanation:** **Linitis plastica** (also known as "leather bottle stomach") is a classic morphological presentation of **Diffuse-type Gastric Adenocarcinoma** (Lauren classification) [1]. **Why Option C is correct:** In this condition, the tumor cells (often **signet ring cells**) infiltrate the stomach wall extensively without forming a discrete mass [1]. This diffuse infiltration triggers a massive **desmoplastic reaction** (fibrosis), leading to marked thickening and rigidity of the entire gastric wall. Grossly, the stomach loses its distensibility and resembles a rigid leather pouch, hence the name [1]. **Why other options are incorrect:** * **Option A:** Lichen planus is a chronic inflammatory mucocutaneous condition; it has no pathological relationship with linitis plastica. * **Option B:** Linitis plastica is a highly aggressive **malignancy** with a poor prognosis, not a benign lesion. * **Option D:** While "itis" usually denotes inflammation, linitis plastica is a neoplastic process. Although the stomach wall is thickened, it is due to cancer and fibrosis, not acute inflammatory cell infiltration. **High-Yield Facts for NEET-PG:** * **Microscopy:** Characterized by **Signet Ring Cells** (nucleus pushed to the periphery by a large mucin vacuole) [1]. * **Genetics:** Often associated with mutations in the **CDH1 gene**, which encodes the cell adhesion protein **E-cadherin** [1]. * **Spread:** Frequently involves the entire stomach and can metastasize to the ovaries (**Krukenberg tumor**). * **Radiology:** Barium meal shows a rigid, narrow, "flask-shaped" stomach with absent mucosal folds. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, pp. 779-780.

Q: Alpha-1 antitrypsin in stool is indicative of which condition?

Protein-losing enteropathy. **Explanation:** **Alpha-1 antitrypsin (A1AT)** is a plasma protein synthesized by the liver with a molecular weight similar to albumin. Unlike other plasma proteins, A1AT is highly resistant to degradation by digestive enzymes (proteolysis) within the intestinal lumen. 1. **Why Option A is correct:** In **Protein-losing enteropathy (PLE)**, there is an excessive loss of serum proteins into the gastrointestinal tract due to mucosal injury or lymphatic obstruction. Because A1AT is not digested or reabsorbed, its presence in the stool serves as a reliable endogenous marker for intestinal protein loss. Measuring the **fecal clearance of A1AT** is considered the gold standard for diagnosing PLE. 2. **Why other options are incorrect:** * **Chronic & Acute Pancreatitis (B & C):** These conditions involve exocrine insufficiency or inflammation. While fecal elastase or chymotrypsin levels are used to assess pancreatic function, A1AT is not a marker for pancreatic pathology. * **Whipple Disease (D):** While Whipple disease *can* cause PLE as a secondary complication (due to lymphatic obstruction), A1AT in the stool specifically indicates the **mechanism** (protein loss) rather than the specific **etiology** (Tropheryma whipplei infection) [1]. **High-Yield Clinical Pearls for NEET-PG:** * **Endogenous Marker:** A1AT is the preferred marker for PLE because it is neither secreted nor absorbed in the gut and remains stable at low pH. * **Limitation:** Fecal A1AT clearance cannot be used if the patient has gastric acid hypersecretion (e.g., Zollinger-Ellison syndrome), as A1AT can be degraded at a pH below 3.0. * **Differential Diagnosis for PLE:** Menetrier’s disease, Celiac disease, Intestinal lymphangiectasia, and Crohn’s disease. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, pp. 798-799.

Q: Stress ulcers are caused by all of the following except?

Penicillin therapy. **Explanation:** Stress ulcers are acute gastric mucosal lesions that develop in patients under severe physiological stress [1]. The correct answer is **Penicillin therapy**, as it is an antibiotic and does not have a known pathophysiological mechanism for inducing gastric ulceration. **Why the other options are causes of Stress Ulcers:** * **Burns (Option A):** Severe burns lead to **Curling’s ulcers**. These occur due to reduced plasma volume and subsequent mucosal ischemia, which compromises the protective gastric barrier [1]. * **Cortisol therapy (Option B):** Exogenous corticosteroids (and high endogenous cortisol) increase gastric acid secretion and decrease the synthesis of protective prostaglandins and mucus, predisposing the mucosa to injury. * **Pulmonary insufficiency (Option C):** Severe respiratory distress or mechanical ventilation causes systemic hypoxia. This leads to splanchnic vasoconstriction and mucosal ischemia, a primary driver of stress-related mucosal disease (SRMD) [1]. **High-Yield Clinical Pearls for NEET-PG:** 1. **Curling’s Ulcer:** Associated with severe **burns** (Think: *Curling* iron causes burns). Usually found in the duodenum. 2. **Cushing’s Ulcer:** Associated with **CNS injury** or increased intracranial pressure. These are caused by vagal overstimulation leading to hypersecretion of gastric acid [1]. (Think: *Cushing* the brain). 3. **Location:** Unlike chronic peptic ulcers, stress ulcers are typically **multiple**, small, and located primarily in the **stomach** (fundus and body). 4. **Pathogenesis:** The common denominator is usually **mucosal ischemia** (except in Cushing’s, where it is hyperacidity) [1]. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Alimentary System Disease, pp. 353-354.

Question 1

All of the following statements are false, except?

Accepted Answer

Ulcerative colitis involves mucosa and submucosa

Answer

Collagenous colitis is seen in children

Answer

Ulcerative colitis is an acute granulomatous disease

Answer

Necrotizing enterocolitis is an acute granulomatous disease

Question 2

What is the most common type of tumor seen in Barrett's esophagus?

Accepted Answer

Adenocarcinoma

Answer

Squamous cell carcinoma

Answer

Melanoma

Answer

Basal cell carcinoma

Question 3

What is the single most important prognostic indicator of colorectal carcinoma?

Accepted Answer

Extent of tumor

Answer

CEA titres

Answer

Degree of atypia

Answer

Size of tumor

Question 4

Ulceration of Peyer's patches occurs in which infection?

Accepted Answer

Salmonella infection

Answer

Amoebiasis

Answer

Crohn's disease

Answer

Clostridium difficile infection

Question 5

Barrett's ulcer is due to:

Accepted Answer

Reflux esophagitis

Answer

Ischemia

Answer

Ectopic gastric mucosa

Answer

Bile reflux

Question 6

Which of the following is a true statement about Barrett's Esophagus?

Accepted Answer

Chronic reflux is a cause.

Answer

It is non-premalignant.

Answer

It progresses to squamous cell carcinoma.

Answer

It is irreversible.

Question 7

Linitis plastica is described as:

Accepted Answer

A diffuse gastric carcinoma

Answer

A disease resembling lichen planus

Answer

A benign lesion of the stomach

Answer

Inflammation of the stomach resembling acute gastritis

Question 8

Alpha-1 antitrypsin in stool is indicative of which condition?

Accepted Answer

Protein-losing enteropathy

Answer

Chronic pancreatitis

Answer

Acute pancreatitis

Answer

Whipple disease

Question 9

Which of the following statements about Barrett's esophagus are true?

Accepted Answer

Metaplasia, leads to adenocarcinoma, and long esophageal segment involved are true, while peptic ulcer and paraesophageal hernia are false.

Answer

Metaplasia, peptic ulcer, and paraesophageal hernia are true, while leads to adenocarcinoma and long esophageal segment involved are false.

Answer

Metaplasia, leads to adenocarcinoma are true, while peptic ulcer, paraesophageal hernia, and long esophageal segment involved are false.

Answer

Metaplasia and peptic ulcer are true, while paraesophageal hernia, leads to adenocarcinoma, and long esophageal segment involved are false.

Question 10

Stress ulcers are caused by all of the following except?

Accepted Answer

Penicillin therapy

Answer

Burns

Answer

Cortisol therapy

Answer

Pulmonary insufficiency

Gastrointestinal Pathology — MCQs

Gastrointestinal Pathology — MCQs

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