Gastrointestinal Pathology Practice Questions

Q: What structure arises from the apex of an infected non-vital tooth?

Radicular Cyst. **Explanation:** The correct answer is **Radicular Cyst** (also known as a Periapical Cyst). **1. Why Radicular Cyst is correct:** A radicular cyst is the most common odontogenic cyst. It originates from the **apex of a non-vital (necrotic) tooth**. The process begins when dental caries lead to pulp necrosis, causing inflammation at the root apex (periapical periodontitis). This inflammation stimulates the **Rest Cells of Malassez** (remnants of Hertwig’s epithelial root sheath) in the periodontal ligament to proliferate, eventually forming a fluid-filled cyst. **2. Why other options are incorrect:** * **Dentigerous Cyst:** This is a follicular cyst that forms around the **crown of an unerupted tooth** (most commonly the mandibular 3rd molar). It attaches at the cemento-enamel junction (CEJ). * **Odontogenic Keratocyst (OKC):** Arises from the dental lamina. It is known for its aggressive behavior, high recurrence rate, and association with the PTCH gene mutation. It is not specifically caused by tooth infection. * **Gorlin Cyst:** Also known as Calcifying Odontogenic Cyst (COC). It is characterized histologically by "ghost cells" and is not related to non-vital teeth. **3. NEET-PG High-Yield Pearls:** * **Most common odontogenic cyst:** Radicular Cyst. * **Radiological appearance:** A well-defined unilocular radiolucency at the root apex. * **Key Histology:** Lined by non-keratinized stratified squamous epithelium; may show **Rushton bodies** (hyaline bodies). * **Gorlin-Goltz Syndrome:** Associated with multiple OKCs, basal cell carcinomas, and bifid ribs.

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: Which of the following is an important risk factor for the development of squamous cell carcinoma?

Consumption of whisky. **Explanation:** The development of **Esophageal Squamous Cell Carcinoma (SCC)** is strongly linked to chronic irritation of the mucosal lining. **1. Why Option A is Correct:** Alcohol consumption is a major risk factor for SCC. However, the risk is significantly higher with **concentrated spirits (like whisky)** compared to beverages with lower alcohol content. High-proof alcohol acts as a direct mucosal irritant and a solvent that facilitates the penetration of other carcinogens (like tobacco) into the esophageal epithelium. In many studies, the risk of SCC increases linearly with the amount and concentration of alcohol consumed. **2. Analysis of Incorrect Options:** * **Option B (Beer):** While all alcohol increases risk, beer has a lower concentration of ethanol compared to whisky. Epidemiological data consistently show a stronger correlation between hard spirits and SCC. * **Option C (Barrett's Esophagus):** This is the classic precursor lesion for **Adenocarcinoma**, not Squamous Cell Carcinoma. It involves intestinal metaplasia (columnar epithelium) due to chronic GERD. * **Option D (Esophageal Web):** While associated with Plummer-Vinson Syndrome (which increases SCC risk), a solitary esophageal web is a less direct or potent risk factor compared to the chronic, systemic insult of heavy spirit consumption. **3. NEET-PG High-Yield Pearls:** * **SCC Risk Factors:** Smoking and Alcohol (synergistic effect), Achalasia cardia, Lye ingestion (highest relative risk), and Tylosis (100% lifetime risk). * **Location:** SCC most commonly involves the **upper and middle thirds** of the esophagus, whereas Adenocarcinoma involves the lower third. * **Dietary Factors:** Deficiencies in Vitamin A, C, and Zinc are also linked to SCC.

Question 1

What structure arises from the apex of an infected non-vital tooth?

Accepted Answer

Radicular Cyst

Answer

Dentigerous Cyst

Answer

Odontogenic Keratocyst

Answer

Gorlin Cysts

Question 2

Which proto-oncogene is involved in Gastrointestinal Stromal Tumors (GIST)?

Accepted Answer

KIT

Answer

RAS

Answer

RET

Answer

MYC

Question 3

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 4

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 5

What is the most common type of gastric polyp?

Accepted Answer

Hyperplastic polyp

Answer

Hamartomatous polyp

Answer

Malignant polyp

Answer

Familial polyposis

Question 6

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 7

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 8

Which of the following is an important risk factor for the development of squamous cell carcinoma?

Accepted Answer

Consumption of whisky

Answer

Consumption of beer

Answer

Barrett's esophagus

Answer

Esophageal web

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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