Gastrointestinal Pathology Practice Questions

Q: Warthin's tumor is characterized by which of the following features?

Multifocal and bilateral. **Explanation:** Warthin’s tumor, also known as **Papillary Cystadenoma Lymphomatosum**, is the second most common benign salivary gland tumor, occurring almost exclusively in the **parotid gland**. **1. Why Option A is Correct:** Warthin’s tumor is unique among salivary gland neoplasms due to its tendency for **multifocality** (multiple separate tumor foci within the same gland) and **bilaterality** (occurring in both the left and right parotid glands). It is the most common salivary gland tumor to present bilaterally, occurring in approximately **10–15%** of cases. This is attributed to the tumor arising from salivary gland ductal epithelium entrapped within intra-parotid lymph nodes during embryogenesis. **2. Why Other Options are Incorrect:** * **Options B, C, and D:** While many Warthin’s tumors may clinically present as a single lump (unifocal/unilateral), the *characteristic* pathological feature tested in exams is its high propensity for being multifocal and bilateral compared to other tumors like Pleomorphic Adenoma (which is typically solitary and unilateral). **Clinical Pearls for NEET-PG:** * **Risk Factor:** Strongly associated with **smoking** (8-fold increased risk). * **Demographics:** Typically affects older males (5th–6th decade). * **Imaging:** Shows high uptake on **Technetium-99m (99mTc) pertechnetate scan** (Hot tumor) because the oncocytes lack the ability to secrete the isotope. * **Histology:** Characterized by a **double layer of oncocytic epithelium** forming papillary projections into cystic spaces, with a dense **lymphoid stroma** (germinal centers). * **Malignant Transformation:** Extremely rare (<1%).

Q: What is the most common congenital anomaly of the gastrointestinal tract?

Meckel's diverticulum. **Explanation:** **Meckel’s Diverticulum** is the most common congenital anomaly of the gastrointestinal (GI) tract, occurring in approximately **2% of the population** [1][2]. It is a **true diverticulum** (containing all layers of the intestinal wall) resulting from the failure of the **vitelline duct (omphalomesenteric duct)** to involute during the 5th–7th week of gestation [1][2]. It is typically located on the antimesenteric border of the ileum [1]. **Analysis of Options:** * **A. Meckel's diverticulum:** Correct. Its high prevalence (2%) makes it the most frequent GI anomaly. * **B. Patent ductus arteriosus:** Incorrect. While a common congenital anomaly, it is a **cardiovascular** defect, not a gastrointestinal one. * **C & D. Ileal atresia/Jejunal aplasia:** Incorrect. These are significant causes of neonatal intestinal obstruction but are far less common than Meckel’s diverticulum. They typically result from vascular accidents *in utero*. **Clinical Pearls for NEET-PG (The "Rule of 2s"):** * **Prevalence:** 2% of the population. * **Location:** Within 2 feet (approx. 60 cm) of the ileocecal valve [1]. * **Length:** Usually 2 inches long. * **Age:** Often presents before age 2. * **Ectopic Tissue:** Most commonly contains **gastric mucosa** (leading to painless bleeding/peptic ulceration) or pancreatic tissue [1][2]. * **Diagnosis:** The investigation of choice for a bleeding Meckel’s is the **Technetium-99m pertechnetate scan** (Meckel scan), which identifies ectopic gastric mucosa. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Alimentary System Disease, pp. 359-360. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, pp. 757-760.

Q: What is the term for gas-filled cysts found in the subserosa or submucosa of the small intestine or colon?

Pneumatosis cystoides intestinalis. **Explanation:** **Pneumatosis cystoides intestinalis (PCI)** is a rare condition characterized by multiple gas-filled cysts located within the subserosa or submucosa of the gastrointestinal tract, most commonly involving the small intestine and colon. 1. **Why Option A is correct:** The term "pneumatosis" refers to the presence of air, and "cystoides" refers to the cyst-like appearance. These cysts contain a mixture of nitrogen, hydrogen, and carbon dioxide. Pathologically, they are lined by multinucleated giant cells and macrophages. PCI can be primary (idiopathic) or secondary to conditions like COPD, necrotizing enterocolitis (NEC), or bowel ischemia. 2. **Why other options are incorrect:** * **Crohn’s Disease:** This is an inflammatory bowel disease characterized by transmural inflammation, non-caseating granulomas, and "creeping fat," but not gas-filled cysts. * **Ulcerative Colitis:** This involves superficial mucosal inflammation and crypt abscesses. While it can lead to "toxic megacolon" (dilated bowel), it does not present with intramural gas cysts. * **Mesenteric Cyst:** These are fluid-filled (chylous or serous) lesions located within the mesentery, not gas-filled cysts within the bowel wall layers. **NEET-PG High-Yield Pearls:** * **Radiological Sign:** On X-ray or CT, PCI presents as a linear or circular collection of gas within the bowel wall, often referred to as **"pneumatosis intestinalis."** * **Clinical Significance:** In neonates, the presence of pneumatosis intestinalis is the **pathognomonic radiological feature of Necrotizing Enterocolitis (NEC).** * **Complication:** Rupture of these subserosal cysts can lead to **benign pneumoperitoneum** (free air under the diaphragm without signs of peritonitis).

Q: Which mutation is NOT seen in diffuse type of gastric cancer?

APC. **Explanation:** Gastric adenocarcinoma is classified by the **Lauren classification** into two distinct types: **Intestinal** and **Diffuse**. These types differ significantly in their molecular pathogenesis. **Why APC is the correct answer:** The **APC (Adenomatous Polyposis Coli)** gene mutation is a hallmark of the **Intestinal type** of gastric cancer [1]. It follows the "adenoma-carcinoma sequence," similar to colorectal cancer, and is often associated with chronic gastritis, H. pylori infection, and intestinal metaplasia [1]. It is **not** typically involved in the pathogenesis of the Diffuse type. **Analysis of incorrect options:** * **E-cadherin (CDH1):** This is the most characteristic mutation in **Diffuse type** gastric cancer [1]. Loss of E-cadherin leads to a lack of cell adhesion, resulting in the classic "discohesive" cells and **Signet ring cell** morphology [1]. * **p53 (TP53):** Mutations in the p53 tumor suppressor gene are common in both intestinal and diffuse types of gastric cancer, as well as many other malignancies. * **p16 (INK4a):** Inactivation of p16 (via hypermethylation or mutation) is frequently observed in both types of gastric cancer, contributing to cell cycle dysregulation. **NEET-PG High-Yield Pearls:** * **Diffuse Type:** Associated with *Linitis Plastica* (leather bottle stomach), Signet ring cells, and is NOT associated with H. pylori [1]. It has a worse prognosis and occurs in younger patients [1]. * **Intestinal Type:** Associated with H. pylori, intestinal metaplasia, and bulky/exophytic masses [1]. * **Krukenberg Tumor:** Bilateral ovarian metastasis, most commonly from a diffuse-type gastric primary. * **Virchow’s Node:** Left supraclavicular lymphadenopathy indicating gastric malignancy. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, pp. 778-779.

Question 1

Which of the following is NOT true about Menetrier's disease?

Accepted Answer

Hyperchlorhydria

Answer

Protein loss

Answer

Cobblestone appearance of mucosa

Answer

Associated with CMV and H. pylori

Question 2

Warthin's tumor is characterized by which of the following features?

Accepted Answer

Multifocal and bilateral

Answer

Multifocal and unilateral

Answer

Unifocal and bilateral

Answer

Unifocal and unilateral

Question 3

What is the most likely consequence of a sialolith (salivary stone) in the excretory duct?

Accepted Answer

Mucous retention cyst

Answer

Chronic sialadenitis

Answer

Pleomorphic adenoma

Answer

Rupture of the duct

Question 4

What is the most common congenital anomaly of the gastrointestinal tract?

Accepted Answer

Meckel's diverticulum

Answer

Patent ductus arteriosus

Answer

Ileal atresia

Answer

Jejunal aplasia

Question 5

Which of the following is associated with Familial Adenomatous Polyposis (FAP)?

Accepted Answer

Gardner's syndrome

Answer

Peutz-Jeghers syndrome

Answer

Juvenile polyps

Answer

Hamartomatous polyp

Question 6

What is the term for gas-filled cysts found in the subserosa or submucosa of the small intestine or colon?

Accepted Answer

Pneumatosis cystoides intestinalis

Answer

Crohn's disease

Answer

Ulcerative colitis

Answer

Mesenteric cyst

Question 7

Which mutation is NOT seen in diffuse type of gastric cancer?

Accepted Answer

APC

Answer

E-cadherin

Answer

p16

Answer

p53

Question 8

Morphologic features of celiac disease include all, except?

Accepted Answer

Distended macrophages with PAS-positive granules in the lamina propria

Answer

Increase in intra-epithelial lymphocytes

Answer

Increased crypt to villous ratio

Answer

Elongated, hyperplastic, and tortuous crypts

Question 9

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

Accepted Answer

Premalignant condition

Answer

Benign course

Answer

Squamous metaplasia of the lower esophagus

Answer

Medical treatment is not useful

Question 10

Which of the following features is true regarding Crohn's disease?

Accepted Answer

Presence of non-caseating granulomas

Answer

Associated with backwash ileitis

Answer

Presence of pseudopolyps

Answer

Associated with broad-based ulcers

Gastrointestinal Pathology — MCQs

Gastrointestinal Pathology — MCQs

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