Gastrointestinal Pathology Practice Questions

Q: What is true regarding carcinoid of the appendix?

Is the most common neoplasm of the appendix.. **Explanation:** **Correct Answer: B. Is the most common neoplasm of the appendix.** Carcinoid tumors (now classified as Neuroendocrine Tumors or NETs) are the most frequent primary neoplasms of the appendix, accounting for approximately 80% of all appendiceal tumors [3]. They are typically discovered incidentally during appendectomies performed for suspected acute appendicitis. **Analysis of Incorrect Options:** * **Option A:** Carcinoid tumors most commonly occur at the **tip of the appendix** (70-75% of cases), not the base. When located at the base, they may cause luminal obstruction leading to appendicitis. * **Option C:** Most appendiceal carcinoids are small ( 2 cm, involves the resection margin (base), or shows evidence of mesoappendiceal invasion [1]. * **Option D:** Metastases are **extremely rare** (less than 2%) for appendiceal carcinoids, especially those under 2 cm [1]. Consequently, Carcinoid Syndrome is also very rare unless there is extensive hepatic metastasis [2]. **High-Yield Clinical Pearls for NEET-PG:** * **Origin:** Derived from subepithelial neuroendocrine cells (Kulchitsky cells). * **Staining:** Positive for **Chromogranin A** and **Synaptophysin**. * **Histology:** Characterized by "salt and pepper" chromatin and nests of uniform polygonal cells [2]. * **Prognosis:** Appendiceal carcinoids have an excellent prognosis, with a 5-year survival rate exceeding 95%. **References:** [1] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Alimentary System Disease, pp. 375-376. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, pp. 781-782. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, pp. 780-781.

Q: All of the following are true regarding Menetrier's disease, EXCEPT:

Exophytic growth. **Explanation:** **Menetrier’s Disease** is a rare, acquired hypertrophic gastropathy characterized by massive enlargement of the gastric rugae [1]. The correct answer is **Option B (Exophytic growth)** because Menetrier’s disease is characterized by **diffuse mucosal thickening** (resembling cerebral convolutions) rather than a localized, discrete exophytic or polypoid mass. **Analysis of Options:** * **Hypertrophy of gastric mucosa (Option C):** This is the hallmark of the disease. There is profound hyperplasia of surface mucous cells (foveolar cells), leading to the characteristic "giant rugal folds" that typically involve the body and fundus while sparing the antrum [1]. * **Protein loss (Option A):** The excessive secretion of mucus and the leakage of serum proteins across the altered epithelial junctions lead to **protein-losing enteropathy**. This clinically manifests as hypoalbuminemia and peripheral edema. * **Premalignant condition (Option D):** Menetrier’s disease is associated with an increased risk of developing **gastric adenocarcinoma** in adults (estimated risk is roughly 2–15%), necessitating regular endoscopic surveillance [1]. **High-Yield Clinical Pearls for NEET-PG:** * **Pathogenesis:** Driven by excessive secretion of **TGF-α** (Transforming Growth Factor-alpha), which leads to overstimulation of the **EGFR** (Epidermal Growth Factor Receptor). * **Histology:** Shows "corkscrew" appearance of foveolar glands and **atrophy of parietal cells**, leading to **hypochlorhydria** (reduced acid production) [1]. * **Triad:** Giant rugal folds + Hypoalbuminemia + Hypochlorhydria. * **Pediatric cases:** Often associated with **CMV infection** and are usually self-limiting, unlike the chronic progressive course in adults [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, pp. 775-776.

Question 1

A biopsy of the antrum of the stomach of an adult who presents with epigastric pain reveals numerous lymphocytes and plasma cells within the lamina propria, which is of normal thickness. There are also scattered neutrophils within the glandular epithelial cells. A Steiner silver stain from this specimen is positive for a small, curved organism. What is the most likely diagnosis?

Accepted Answer

Helicobacter pylori

Answer

Enteroinvasive Escherichia coli

Answer

Enterotoxigenic E. coli

Answer

Salmonella typhi

Question 2

Which condition is characterized by mucosal melanosis and hamartomatous polyps?

Accepted Answer

Peutz-Jeghers syndrome

Answer

Cronkhite-Canada syndrome

Answer

Familial adenomatous polyposis

Answer

Hereditary nonpolyposis colorectal cancer

Question 3

Which of the following colonic polyps has no risk for malignancy?

Accepted Answer

Juvenile polyps

Answer

Hamartomatous polyps associated with Peutz-Jeghers syndrome

Answer

Juvenile polyposis syndrome

Answer

Familial adenomatous polyposis syndrome

Question 4

Pseudomyxoma peritonei is typically seen in association with which of the following ovarian neoplasms?

Accepted Answer

Mucinous cystadenoma

Answer

Serous cystadenoma

Answer

Pseudomucinous cyst

Answer

Teratoma

Question 5

Which of the following conditions is characterized by villous atrophy?

Accepted Answer

All of the above

Answer

Celiac disease

Answer

Giardiasis

Answer

Tropical sprue

Question 6

What is true regarding carcinoid of the appendix?

Accepted Answer

Is the most common neoplasm of the appendix.

Answer

Most commonly occurs at the base of the appendix.

Answer

Most cases require right hemicolectomy.

Answer

Metastases are quite common.

Question 7

Ulcerative colitis involves which layer of the intestinal wall?

Accepted Answer

Mucosa

Answer

Serosa

Answer

Lamina propria

Answer

Muscularis externa

Question 8

All of the following are true regarding Menetrier's disease, EXCEPT:

Accepted Answer

Exophytic growth

Answer

Protein loss

Answer

Hypertrophy of gastric mucosa

Answer

Premalignant condition

Question 9

The "adenoma-carcinoma sequence" is characteristic of which of the following malignancies?

Accepted Answer

Carcinoma of the colon

Answer

Follicular thyroid carcinoma

Answer

Carcinoma of the gallbladder

Answer

Carcinoma of the stomach

Question 10

Which of the following is FALSE regarding Peutz-Jeghers syndrome?

Accepted Answer

Autosomal recessive inheritance

Answer

Presence of hamartomatous polyps

Answer

Presence of cutaneous pigmentation

Answer

Increased risk of developing breast, lung, and ovarian cancers

Gastrointestinal Pathology — MCQs

Gastrointestinal Pathology — MCQs

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