Gastrointestinal Pathology Practice Questions

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: Which of the following is the most prominent feature of immunoproliferative small intestinal disease (IPSID)?

Abdominal pain. **Explanation:** **Immunoproliferative Small Intestinal Disease (IPSID)**, also known as Mediterranean lymphoma or Alpha-chain disease, is a variant of MALT lymphoma associated with *Campylobacter jejuni* infection. It is characterized by the proliferation of B-lymphocytes that secrete truncated alpha-heavy chains. 1. **Why Abdominal Pain is Correct:** **Abdominal pain** is the most frequent and prominent presenting symptom, occurring in approximately 80-90% of patients. It is typically chronic, diffuse, and cramping in nature. The pain results from the extensive infiltration of the small intestinal lamina propria by plasma cells and lymphocytes, leading to dysmotility and peritoneal irritation. 2. **Analysis of Incorrect Options:** * **Malabsorption (A):** While malabsorption (presenting as diarrhea and weight loss) is a classic feature of IPSID due to villous atrophy, it usually follows or accompanies the onset of pain. It is a major clinical consequence but not the most "prominent" initial complaint compared to pain. * **Obstruction (B):** Intestinal obstruction is a late-stage complication occurring if the disease transforms into high-grade large-cell lymphoma forming bulky masses. It is not a primary or most common feature. * **Bleeding (C):** Gastrointestinal bleeding is rare in IPSID as the lesion is typically an infiltrative mucosal process rather than an ulcerative or vascular one. **High-Yield Clinical Pearls for NEET-PG:** * **Epidemiology:** Most common in young adults (20-30s) in developing countries (Middle East/Mediterranean). * **Pathogenesis:** Strong association with **Alpha-heavy chain** production (detected on serum electrophoresis). * **Treatment:** Early-stage disease (Stage A) can often be cured with **antibiotics** (Tetracycline), while late stages require CHOP chemotherapy. * **Key Histology:** Dense "lymphoplasmacytic" infiltration of the lamina propria.

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.

Q: A 51-year-old male presents with blood-stained stools and abdominal pain. Based on the image shown, what is the most likely diagnosis?

Intussusception. ***Intussusception*** - The **target sign** or **concentric ring sign** on CT imaging is pathognomonic for intussusception, showing the telescoped bowel loops. - In adults, intussusception often has a **lead point** (tumor, polyp) and presents with intermittent abdominal pain and bloody stools. *Crohn's disease* - CT typically shows **bowel wall thickening**, **skip lesions**, and **mesenteric fat stranding** rather than the target sign. - Presents with chronic diarrhea, weight loss, and **transmural inflammation** affecting the terminal ileum most commonly. *Diverticulosis* - CT reveals **outpouchings** of the bowel wall and **diverticular inflammation** if complicated by diverticulitis. - Usually affects the **sigmoid colon** in Western populations and presents with left lower quadrant pain. *Sigmoid volvulus* - CT shows the classic **coffee bean sign** with a dilated, twisted sigmoid loop and **whirl sign** at the point of torsion. - Presents with severe **colicky abdominal pain**, distension, and **obstipation** (inability to pass gas or stool).

Question 1

Barrett's esophagus is characterized by which of the following histological changes?

Accepted Answer

Intestinal metaplasia

Answer

Intestinal dysplasia

Answer

Squamous cell metaplasia

Answer

Columnar cell metaplasia

Question 2

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 3

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 4

Which of the following is the most prominent feature of immunoproliferative small intestinal disease (IPSID)?

Accepted Answer

Abdominal pain

Answer

Malabsorption

Answer

Obstruction

Answer

Bleeding

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

A 51-year-old male presents with blood-stained stools and abdominal pain. Based on the image shown, what is the most likely diagnosis?

Accepted Answer

Intussusception

Answer

Crohn's disease

Answer

Diverticulosis

Answer

Sigmoid volvulus

Question 9

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 10

All of the following polyps are premalignant except?

Accepted Answer

Juvenile polyp

Answer

Juvenile polyposis syndrome

Answer

Familial polyposis syndrome

Answer

Peutz-Jeghers syndrome

Gastrointestinal Pathology — MCQs

Gastrointestinal Pathology — MCQs

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