Gastrointestinal Pathology Practice Questions

Q: A 60-year-old patient with a prolonged history of tobacco chewing presents with symptoms of weight loss and dysphagia. An esophageal biopsy from a projectile mass is shown below. What is your likely diagnosis?

Squamous cell carcinoma. ***Squamous cell carcinoma*** - **Tobacco chewing** is a major risk factor for **esophageal squamous cell carcinoma**, especially in the upper and middle esophagus. - Histologically characterized by **keratin pearls**, **intercellular bridges**, and **dyskeratosis** in the epithelial cells. *Adenocarcinoma* - Primarily associated with **gastroesophageal reflux disease (GERD)** and **Barrett's esophagus**, not tobacco chewing. - Typically occurs in the **lower esophagus** and shows **glandular architecture** with mucin production. *Carcinoid tumor* - Arises from **neuroendocrine cells** and is extremely rare in the esophagus compared to stomach or small bowel. - Presents with **carcinoid syndrome** (flushing, diarrhea) and shows **uniform cells** with **salt-and-pepper chromatin** pattern. *Small cell cancer* - Very rare in the esophagus and more commonly seen in the **lungs** of heavy smokers. - Shows **small blue cells** with scant cytoplasm and high **mitotic rate**, different from squamous morphology.

Q: Meckel Diverticulum is a remnant of which embryonic structure?

Vitellointestinal duct. **Explanation:** **1. Why the Correct Answer is Right:** Meckel diverticulum is the most common congenital anomaly of the gastrointestinal tract. It occurs due to the **failure of the vitellointestinal duct** (also known as the **omphalomesenteric duct**) to involute completely [1], [2]. During early embryonic life (around the 5th to 8th week), this duct connects the primitive midgut lumen to the yolk sac. Normally, it obliterates and disappears; however, its persistence at the ileal end results in a "true" diverticulum (containing all layers of the bowel wall) [1], [2]. **2. Why Incorrect Options are Wrong:** * **A. Vitelloumbilical duct:** This is a misnomer. While the duct connects the gut to the umbilicus, the standard anatomical term is vitellointestinal or omphalomesenteric duct. * **C & D. Vitelloportal / Vitellodiaphragmatic duct:** These are fabricated terms and do not represent recognized embryonic structures in human development. **3. Clinical Pearls for NEET-PG (Rule of 2s):** * **Prevalence:** Occurs in **2%** of the population. * **Location:** Usually located within **2 feet** (60 cm) of the ileocecal valve [2]. * **Length:** Approximately **2 inches** long. * **Age:** Often becomes symptomatic 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 diverticulum is the **Technetium-99m pertechnetate scan** (Meckel scan), which identifies ectopic gastric mucosa. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, pp. 759-760. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Alimentary System Disease, pp. 359-360.

Q: What is characteristic of a typhoid ulcer?

All of the above. **Explanation:** Typhoid fever, caused by *Salmonella typhi*, primarily affects the lymphoid tissue of the small intestine, specifically the **Peyer’s patches** in the terminal ileum [1]. Understanding the morphology of typhoid ulcers is high-yield for NEET-PG. 1. **Ulceration of Peyer's Patches:** The pathogenesis involves the infiltration of Peyer’s patches by macrophages (typhoid cells), leading to hyperplasia, necrosis, and subsequent sloughing of the overlying mucosa [1]. This results in the formation of classic typhoid ulcers. 2. **Longitudinal Orientation:** Because Peyer’s patches are arranged along the long axis of the bowel, the resulting ulcers are **longitudinal (oval)** in shape. This is a critical distinguishing feature from **Tubercular ulcers**, which are typically transverse (circumferential) because they follow the path of the lymphatics. 3. **Risk of Perforation:** These ulcers are deep and involve the lymphoid tissue. During the third week of the disease, the necrotic tissue sloughs off, which can lead to complications such as intestinal hemorrhage or **perforation**, usually in the terminal ileum. **Why "All of the above" is correct:** Since typhoid ulcers are derived from Peyer's patches (A), are oriented longitudinally (B), and carry a significant risk of perforation (C), all statements are pathologically accurate. **High-Yield Clinical Pearls for NEET-PG:** * **Microscopy:** Look for **"Typhoid cells"** (activated macrophages containing erythrocytes and bacilli—erythrophagocytosis) and **Mallory nodules** in the liver/spleen. * **Widal Test:** Becomes positive in the 2nd week. * **Blood Culture:** Most sensitive in the 1st week (Mnemonic: **BASU** – Blood, Agglutination/Widal, Stool, Urine for weeks 1, 2, 3, and 4 respectively). **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Alimentary System Disease, pp. 362-363.

Question 1

A patient presents with diarrhea, malabsorption, abdominal pain, and arthralgia. Intestinal biopsy reveals PAS-positive organisms within macrophages. What is the most likely diagnosis?

Accepted Answer

Whipple's disease

Answer

Celiac sprue

Answer

Zollinger-Ellison syndrome

Answer

Crohn's disease

Question 2

A 50-year-old male presents with a history of Gastroesophageal reflux disease. What is the most common pathological finding associated with this condition?

Accepted Answer

Columnar metaplasia

Answer

Squamous metaplasia

Answer

Dysplasia

Answer

Malignancy

Question 3

What is the most common type of gastric polyp?

Accepted Answer

Hyperplastic polyp

Answer

Hamartomatous polyp

Answer

Malignant polyp

Answer

Familial polyposis

Question 4

Which marker is used for the early diagnosis of Hirschsprung disease?

Accepted Answer

Acetylcholinesterase

Answer

Adrenaline

Answer

VIP

Answer

None of the above

Question 5

What is the most important prognostic indicator in esophageal carcinoma?

Accepted Answer

Depth of invasion

Answer

Length of involvement

Answer

Histological grading

Answer

Immunohistochemistry

Question 6

A 60-year-old patient with a prolonged history of tobacco chewing presents with symptoms of weight loss and dysphagia. An esophageal biopsy from a projectile mass is shown below. What is your likely diagnosis?

Accepted Answer

Squamous cell carcinoma

Answer

Adenocarcinoma

Answer

Carcinoid tumor

Answer

Small cell cancer

Question 7

Meckel Diverticulum is a remnant of which embryonic structure?

Accepted Answer

Vitellointestinal duct

Answer

Vitelloumbilical duct

Answer

Vitelloportal duct

Answer

Vitellodiaphragmatic duct

Question 8

What is characteristic of a typhoid ulcer?

Accepted Answer

All of the above

Answer

Ulceration of the Peyer's patch

Answer

Longitudinal ulcer

Answer

May perforate

Question 9

Which of the following anaemias is a risk factor for the development of gastric carcinoma?

Accepted Answer

Pernicious anaemia

Answer

Megaloblastic anaemia

Answer

Aplastic anaemia

Answer

Haemolytic anaemia

Question 10

Type B gastritis is characterized by predominance in which region of the stomach?

Accepted Answer

Antral predominant

Answer

Body predominant

Answer

Fundus predominant

Answer

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Gastrointestinal Pathology — MCQs

Gastrointestinal Pathology — MCQs

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