Gastrointestinal Pathology Practice Questions

Q: Hourglass deformity is seen in which of the following conditions?

Peptic ulcer disease. **Explanation:** **1. Why Peptic Ulcer Disease (PUD) is correct:** The "Hourglass stomach" deformity is a classic complication of chronic gastric ulcers, typically located on the **lesser curvature** [1]. It occurs due to chronic inflammation and subsequent **fibrosis (cicatrization)**. As the ulcer heals, the fibrous tissue contracts, pulling the greater curvature toward the lesser curvature. This creates a central constriction that divides the stomach into two distinct pouches, resembling an hourglass. **2. Analysis of Incorrect Options:** * **Carcinoma of the stomach:** Typically presents as a "Leather bottle stomach" (**Linitis Plastica**) in the diffuse type (Signet ring cell carcinoma). This involves a rigid, thickened, and non-distensible stomach wall due to submucosal infiltration, rather than a localized central constriction. * **Duodenal atresia:** Characterized by the **"Double bubble sign"** on X-ray. It is a congenital obstruction of the duodenum resulting in a dilated stomach and a dilated proximal duodenum. * **Congenital Hypertrophic Pyloric Stenosis (CHPS):** Presents with a "String sign" or "Beak sign" on contrast studies and an "Olive-shaped mass" on palpation. It involves hypertrophy of the pyloric sphincter, leading to gastric outlet obstruction, not a mid-stomach constriction. **3. NEET-PG High-Yield Pearls:** * **Leather bottle stomach:** Linitis Plastica (Gastric Cancer). * **Cup and spill/Cascade stomach:** A functional or structural variation where the fundus folds back on the body. * **Watermelon stomach:** Gastric Antral Vascular Ectasia (GAVE). * **Most common site for Peptic Ulcer:** First part of the duodenum (Duodenal Ulcer) and Lesser curvature/Antrum (Gastric Ulcer) [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, pp. 773-774.

Q: What is the most common site of ulcerative colitis?

Rectum. **Explanation:** **Ulcerative Colitis (UC)** is a chronic inflammatory bowel disease characterized by diffuse, mucosal inflammation limited to the colon. **Why Rectum is the correct answer:** The hallmark of Ulcerative Colitis is that it **always involves the rectum** (proctitis) and extends proximally in a **continuous, symmetrical fashion** without skip lesions [1]. In approximately 95% of cases, the rectum is involved at the time of diagnosis, making it the most common and characteristic site of the disease. **Analysis of Incorrect Options:** * **B. Caecum:** While UC can involve the caecum (as part of pancolitis), it is rarely the primary or most common site. An exception is "backwash ileitis," where the terminal ileum is affected secondary to total colonic involvement [1]. * **C. Small Intestine:** UC is primarily a disease of the **large intestine**. Small bowel involvement is a distinguishing feature of Crohn’s Disease, not UC (except for the aforementioned backwash ileitis). * **D. Appendix:** While appendiceal inflammation can sometimes be seen in UC (appendiceal "skip" lesion), it is not the most common site [1]. Interestingly, prior appendectomy is considered a protective factor against developing UC. **High-Yield Clinical Pearls for NEET-PG:** * **Distribution:** Continuous involvement; starts in the rectum and moves proximally [1]. * **Depth:** Limited to the **mucosa and submucosa** (unlike Crohn’s, which is transmural) [1]. * **Microscopy:** Characterized by **Crypt abscesses** (neutrophils in crypt lumens) and crypt distortion. * **Gross Features:** Pseudopolyps (regenerating mucosa) and "Lead-pipe" appearance on barium enema due to loss of haustrations. * **Complications:** Toxic megacolon and a significantly higher risk of **Adenocarcinoma** compared to Crohn’s. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Alimentary System Disease, pp. 367-368.

Q: An elderly male with a history of long-term antibiotic intake presents with profuse watery diarrhea and abdominal cramps. The colonoscopic biopsy findings are shown in the image. What is the most likely diagnosis?

Pseudomembranous Colitis. ***Pseudomembranous Colitis*** - History of **long-term antibiotic use** leading to **C. difficile** overgrowth causing profuse watery diarrhea is pathognomonic for pseudomembranous colitis. - Colonoscopic biopsy shows characteristic **volcano/summit lesions** with **pseudomembranes** composed of fibrin, mucus, and inflammatory debris overlying damaged epithelium. *Crohn's disease* - Characterized by **transmural inflammation** with **skip lesions** and **granulomas**, not pseudomembranes. - Typically presents with **bloody diarrhea**, **weight loss**, and **perianal disease** rather than watery diarrhea following antibiotic use. *Ulcerative colitis* - Shows **continuous mucosal inflammation** limited to mucosa and submucosa with **crypt abscesses**. - Presents with **bloody diarrhea** and **tenesmus**, not the watery diarrhea pattern seen with antibiotic-associated colitis. *Amoebic colitis* - Caused by **Entamoeba histolytica** showing **flask-shaped ulcers** and **trophozoites** in tissue. - Associated with **travel history** to endemic areas and **bloody mucoid stools**, not antibiotic exposure history.

Question 1

Which intestinal polyp has the potential to grow into cancer?

Accepted Answer

Adenomatous polyp

Answer

Hyperplastic polyp

Answer

Juvenile polyp

Answer

Hamartomatous polyp

Question 2

Anal cancer is associated with which of the following viruses?

Accepted Answer

Human papilloma virus

Answer

Epstein-Barr virus (EBV)

Answer

Human T-lymphotropic virus 1 (HTLV-1)

Answer

Polyoma virus

Question 3

A patient presents with symmetrical, persistent, and painless swelling of the lacrimal and salivary glands. The patient reports no or minimal xerostomia and shows a positive response to steroid therapy. What is the most likely diagnosis?

Accepted Answer

Mikulicz disease

Answer

Primary Sjögren syndrome

Answer

Secondary Sjögren syndrome

Answer

All of the above

Question 4

Hourglass deformity is seen in which of the following conditions?

Accepted Answer

Peptic ulcer disease

Answer

Carcinoma of the stomach

Answer

Duodenal atresia

Answer

Congenital hypertrophic pyloric stenosis

Question 5

What is the most common site of ulcerative colitis?

Accepted Answer

Rectum

Answer

Caecum

Answer

Small intestine

Answer

Appendix

Question 6

Which of the following is NOT true regarding Barrett's esophagus?

Accepted Answer

Increased incidence of squamous cell carcinoma

Answer

It represents metaplasia

Answer

It involves columnar epithelium

Answer

It typically involves the lower esophagus

Question 7

A patient has an increased number of columnar cells in the lower esophagus. Which of the following histological changes is present?

Accepted Answer

Metaplasia

Answer

Dysplasia

Answer

Anaplasia

Answer

Normal histology

Question 8

An elderly male with a history of long-term antibiotic intake presents with profuse watery diarrhea and abdominal cramps. The colonoscopic biopsy findings are shown in the image. What is the most likely diagnosis?

Accepted Answer

Pseudomembranous Colitis

Answer

Crohn's disease

Answer

Ulcerative colitis

Answer

Amoebic colitis

Question 9

A 54-year-old man presents with dysphagia, heartburn, belching, and epigastric pain. A barium swallow shows a sliding hiatal hernia and a stricture situated higher than usual in the mid-esophagus. Endoscopic findings suggest Barrett's esophagus with marked esophagitis and linear ulcerations. Biopsy confirms columnar epithelium at the affected area and normal squamous epithelium above. What statement is TRUE regarding this condition?

Accepted Answer

The present treatment is aimed at preventing esophagitis.

Answer

Adenocarcinoma is less common in Barrett's esophagus.

Answer

Most patients do not have associated gastroesophageal reflux.

Answer

The presence of ectopic gastric lining protects against aspiration during sleep and prevents recurrent pneumonitis.

Question 10

Which condition involves the entire thickness of the bowel wall with skin lesions?

Accepted Answer

Crohn's disease

Answer

Ulcerative colitis

Answer

Irritable bowel syndrome

Answer

Both Crohn's disease and ulcerative colitis

Gastrointestinal Pathology — MCQs

Gastrointestinal Pathology — MCQs

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