Gastrointestinal Malignancies — MCQs
What is the most precancerous condition associated with an increased risk of carcinoma of the colon?
What condition is associated with a greater risk of gastric carcinoma?
Which of the following genes is least likely to be involved in the development of carcinoma of the colon?
All of the following are associated with increased risk of gastric adenocarcinoma except which of the following?
The most appropriate screening modality for hepatocellular carcinoma
A patient presents with painless jaundice and a palpable gallbladder. What is the most likely diagnosis?
All of the following are potential complications of untreated GERD, EXCEPT which of the following?
Which of the following statements about peptic ulcers is correct?
What disease is associated with ascitic fluid SAAG < 1.1?
Identify the condition shown in the image.
Gastrointestinal Malignancies Indian Medical PG Practice Questions and MCQs
Question 1: What is the most precancerous condition associated with an increased risk of carcinoma of the colon?
- A. Familial polyposis (Correct Answer)
- B. Juvenile polyps
- C. Hyperplastic polyps
- D. Hamartomatous polyps
Explanation: ***Familial polyposis*** - This condition, more accurately known as **Familial Adenomatous Polyposis (FAP)**, is characterized by hundreds to thousands of adenomatous polyps in the colon. [1] - The risk of developing **colorectal carcinoma** in FAP patients approaches 100% by age 30-40 if left untreated, making it the most significant pre-cancerous condition. [1] *Hamartomatous polyps* - These polyps are malformations of normal tissue components, not neoplastic growths, and generally have a **low malignant potential**. - While certain hamartomatous polyposis syndromes (e.g., Peutz-Jeghers syndrome) carry an increased cancer risk, solitary hamartomatous polyps rarely transform into carcinoma. [2] *Juvenile polyps* - These are a type of **hamartomatous polyp** found predominantly in children, often presenting with rectal bleeding. [2] - They are typically benign and have a **very low malignant potential**, especially when solitary. [2] *Hyperplastic polyps* - These are common, small, and usually located in the rectosigmoid colon, composed of well-differentiated epithelial cells with a "saw-tooth" appearance. - They are generally considered **benign** and do not carry a significant risk of malignant transformation. [1] **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, pp. 821-822. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, pp. 814-815.
Question 2: What condition is associated with a greater risk of gastric carcinoma?
- A. Old age
- B. Cardiac end ulcer
- C. Prepyloric ulcer
- D. Intestinal metaplasia (Correct Answer)
Explanation: ***Intestinal metaplasia*** - Intestinal metaplasia is a known **precursor** condition associated with an increased risk of gastric carcinoma due to the transformation of gastric epithelium [1,2]. - This condition often arises from **chronic gastritis**, particularly after **H. pylori** infection, advancing the risk of malignant transformation [1,2]. *Old age* - While old age is a **risk factor** for various cancers, it is not specifically associated with gastric carcinoma without other factors. - The incidence of gastric cancer is more correlated with specific **precursor lesions** rather than just age alone. *Cardiac end ulcer* - Cardiac ulcers are typically **benign lesions** and not directly pre-cancerous. - They are often related to **chronic reflux disease**, which does not significantly increase the risk of gastric carcinoma. *Prepyloric ulcer* - Prepyloric ulcers may arise due to **peptic ulcer disease** but do not significantly predispose to gastric cancer. - The majority of ulcers can be healing or benign, lacking the malignant potential seen in precancerous lesions like intestinal metaplasia. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, pp. 777-779. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Alimentary System Disease, pp. 354-355.
Question 3: Which of the following genes is least likely to be involved in the development of carcinoma of the colon?
- A. K-ras
- B. Beta-Catenin (Correct Answer)
- C. APC
- D. Mismatch Repair Genes
Explanation: ***Beta-Catenin*** - While **beta-catenin protein accumulation** is critical in colorectal cancer pathogenesis (primarily through APC mutations), direct mutations in the **CTNNB1 gene** (encoding beta-catenin) are **rare in colorectal cancer** (~5% of cases) [1]. - Most colorectal cancers achieve beta-catenin activation indirectly through **APC inactivation**, making beta-catenin gene mutations the least likely mechanism among the listed options [1]. - This contrasts with other cancers (e.g., hepatocellular carcinoma, endometrial cancer) where direct CTNNB1 mutations are more common. *APC* - The **adenomatous polyposis coli (APC) gene** is mutated in approximately **80% of sporadic colorectal cancers**, representing the earliest and most common genetic alteration in the **adenoma-carcinoma sequence** [1]. - APC loss leads to beta-catenin accumulation and constitutive **Wnt pathway activation**, driving uncontrolled cell proliferation [2]. - Germline APC mutations cause **familial adenomatous polyposis (FAP)** [5]. *K-ras* - **K-ras oncogene** mutations occur in **30-50% of colorectal cancers**, typically as an intermediate event in the adenoma-carcinoma progression [1]. - These activating mutations lead to constitutive signaling through the **MAPK pathway**, promoting cell proliferation and survival independent of growth factor signals. *Mismatch Repair Genes* - **Mismatch repair (MMR) genes** (MLH1, MSH2, MSH6, PMS2) are involved in **15-20% of all colorectal cancers** [4]. - Germline mutations cause **Lynch syndrome (HNPCC)** (~3% of CRCs) [5]. - Sporadic **MLH1 promoter hypermethylation** accounts for 12-15% of colorectal cancers, leading to **microsatellite instability (MSI-high)** tumors [3]. - MMR deficiency represents an alternative, well-established pathway of colorectal carcinogenesis. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, p. 819. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Neoplasia, pp. 304-305. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, pp. 819-821. [4] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Alimentary System Disease, pp. 373-374. [5] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, pp. 821-822.
Question 4: All of the following are associated with increased risk of gastric adenocarcinoma except which of the following?
- A. Smoking
- B. Celiac disease (Correct Answer)
- C. H. pylori
- D. Dietary nitrosamines
Explanation: ***Celiac disease*** - While celiac disease increases the risk of certain cancers like **T-cell lymphoma** (e.g., **enteropathy-associated T-cell lymphoma, EATL**) and **small intestinal adenocarcinoma**, it is not a significant risk factor for **gastric adenocarcinoma**. - The primary site of neoplastic transformation in celiac disease is the **small intestine**, not the stomach. *Smoking* - **Smoking** is a well-established risk factor for various cancers, including gastric adenocarcinoma, with a dose-dependent relationship. - It contributes to **chronic inflammation** and **mucosal damage** in the stomach, promoting oncogenesis. *H. pylori* - **_Helicobacter pylori_ infection** is a major causative agent for **gastric adenocarcinoma**, particularly the **intestinal type** [1]. - It induces chronic gastritis, leading to atrophy, intestinal metaplasia, and dysplasia, which are precursors to cancer [1], [2]. *Dietary nitrosamines* - **Dietary nitrosamines**, commonly found in highly processed and preserved foods (smoked meats, pickled vegetables), are potent **carcinogens** [1]. - They are directly linked to an increased risk of **gastric adenocarcinoma**, especially in populations with high consumption of such foods [1].
Question 5: The most appropriate screening modality for hepatocellular carcinoma
- A. CT abdomen
- B. MRI abdomen
- C. Ultrasound (Correct Answer)
- D. PET scan
Explanation: ***Ultrasound*** - **Ultrasound** is the recommended first-line screening modality for hepatocellular carcinoma (HCC) due to its high sensitivity, non-invasiveness, and cost-effectiveness. - It allows for the detection of **hepatic nodules** in patients with risk factors, such as cirrhosis, facilitating early intervention. *CT abdomen* - While **CT scans** are excellent for characterizing liver lesions and staging HCC, they are generally not used for routine screening due to radiation exposure and higher cost. - CT is typically employed as a **diagnostic follow-up** after an abnormal ultrasound finding. *MRI abdomen* - **MRI** provides superior soft tissue contrast and is often used for definitive diagnosis and characterization of liver lesions, especially when ultrasound or CT findings are equivocal. - However, its high cost and longer acquisition time make it unsuitable for **routine screening purposes**. *PET scan* - **PET scans** are primarily used in oncology for evaluating metastatic disease and assessing treatment response, rather than for primary screening of HCC. - HCC is often not highly **fluorodeoxyglucose (FDG)-avid**, limiting the utility of routine PET scanning for initial detection.
Question 6: A patient presents with painless jaundice and a palpable gallbladder. What is the most likely diagnosis?
- A. Cholecystitis
- B. PSC
- C. Pancreatic cancer (Correct Answer)
- D. Hepatitis
Explanation: ***Pancreatic cancer*** - The combination of **painless jaundice** and a **palpable gallbladder** (Courvoisier's sign) is highly suggestive of an obstruction of the common bile duct, most commonly due to pancreatic head cancer. - The tumor in the head of the pancreas compresses the common bile duct, leading to bile back-up and distension of the gallbladder, which is often palpable and non-tender due to the slow, progressive nature of the obstruction. *Cholecystitis* - Cholecystitis typically presents with **painful right upper quadrant abdominal pain**, fever, and nausea, usually due to gallstone obstruction of the cystic duct. - While jaundice can occur if a stone migrates to the common bile duct, the prominent feature of **pain** and the common absence of a palpable, non-tender gallbladder differentiate it. *PSC* - **Primary sclerosing cholangitis (PSC)** is a chronic cholestatic liver disease characterized by progressive inflammation and fibrosis of the bile ducts, which can cause jaundice. - PSC typically doesn't present with a **palpable gallbladder**; it's often associated with inflammatory bowel disease and can lead to cholangitis or cholangiocarcinoma. *Hepatitis* - **Hepatitis** causes jaundice due to hepatocyte dysfunction and inflammation, leading to impaired bilirubin conjugation and excretion. - It usually presents with symptoms like fatigue, nausea, and dark urine, but it does **not typically cause a palpable gallbladder** because it's a hepatocellular rather than an obstructive process.
Question 7: All of the following are potential complications of untreated GERD, EXCEPT which of the following?
- A. Esophageal adenocarcinoma
- B. Esophageal stricture
- C. Barrett's esophagus
- D. Esophageal varices (Correct Answer)
Explanation: ***Esophageal varices*** - **Esophageal varices** are dilated veins in the lower esophagus, almost exclusively caused by **portal hypertension** from conditions like cirrhosis. - They are not a direct complication of **gastroesophageal reflux disease (GERD)**; GERD deals with acid reflux, not increased portal venous pressure. *Esophageal adenocarcinoma* - **Esophageal adenocarcinoma** can develop from **Barrett's esophagus**, which is a metaplastic change in the esophageal lining caused by chronic acid exposure from GERD [1]. - Therefore, untreated GERD can progress through Barrett's esophagus to develop into this type of cancer [1]. *Esophageal stricture* - Chronic inflammation and injury from untreated GERD can lead to **fibrosis** and subsequent narrowing of the esophagus, known as an **esophageal stricture** [1]. - This stricture can cause difficulty swallowing and food impaction. *Barrett's esophagus* - **Barrett's esophagus** is a precancerous condition where the normal squamous epithelium of the esophagus is replaced by columnar epithelium due to chronic acid reflux from GERD [1]. - It is a significant risk factor for esophageal adenocarcinoma and directly results from long-standing GERD [1].
Question 8: Which of the following statements about peptic ulcers is correct?
- A. It is more commonly seen in females.
- B. The most common location is the third part of duodenum.
- C. Anteriorly located duodenal ulcers are 'more prone for perforation'. (Correct Answer)
- D. There is no risk of malignancy in gastric ulcers.
Explanation: Anteriorly located duodenal ulcers are 'more prone for perforation' - The duodenal bulb is largely peritonealized, and an **anterior ulcer** perforates into the peritoneal cavity, leading to **peritonitis**. - Posterior ulcers, in contrast, are more likely to erode into vessels like the **gastroduodenal artery**, causing **hemorrhage** rather than perforation. *It is more commonly seen in females* - Peptic ulcers, particularly **duodenal ulcers**, are generally more common in **men** than women, though the incidence in women has increased. - The prevalence largely depends on risk factors like **NSAID use** and **H. pylori infection**, which do not show a strong female predominance [1]. *The most common location is the third part of duodenum* - The most common location for **duodenal ulcers** is the **first part of the duodenum** (duodenal bulb) [1]. - Ulcers in the third part of the duodenum are less common and may suggest underlying conditions like **Zollinger-Ellison syndrome**. *There is no risk of malignancy in gastric ulcers* - While not all gastric ulcers are malignant, there is a definite **risk of malignancy** associated with **gastric ulcers**, especially within the setting of chronic inflammation or H. pylori infection [1]. - All gastric ulcers, once identified, require follow-up and **biopsy to rule out malignancy**; this is less of a concern for duodenal ulcers.
Question 9: What disease is associated with ascitic fluid SAAG < 1.1?
- A. Peritoneal carcinomatosis (Correct Answer)
- B. Liver failure
- C. Portal vein thrombosis
- D. Tuberculosis peritonitis
Explanation: Peritoneal carcinomatosis - A serum-ascites albumin gradient (SAAG) less than 1.1 g/dL indicates that the ascites is not due to portal hypertension [1]. - In peritoneal carcinomatosis, the malignant cells in the peritoneum disrupt the normal fluid exchange, leading to fluid accumulation that is low in albumin relative to serum [1]. Liver failure - Liver failure, especially when leading to cirrhosis, is typically associated with portal hypertension and a SAAG ≥ 1.1 g/dL [1]. - The high SAAG reflects the increased hydrostatic pressure in the hepatic sinusoids, forcing fluid low in protein into the peritoneal cavity [1]. Portal vein thrombosis - Portal vein thrombosis causes portal hypertension and would therefore be associated with a high SAAG (≥ 1.1 g/dL) [1]. - The obstruction of the portal vein leads to increased sinusoidal hydrostatic pressure, similar to other causes of portal hypertension [1]. Tuberculosis peritonitis - Tuberculosis peritonitis is an inflammatory condition that can cause ascites, but it is typically associated with a SAAG < 1.1 g/dL [1]. - This is because the inflammatory process in the peritoneum allows for the leakage of albumin into the ascitic fluid, diminishing the gradient [1].
Question 10: Identify the condition shown in the image.
- A. Villous adenoma
- B. Hyperplastic polyp
- C. Juvenile polyp
- D. Peutz-Jeghers syndrome (Correct Answer)
Explanation: ***Juvenile polyp*** - Juvenile polyps are commonly found in children and present as **solitary lesions**, usually in the rectum [1]. - They typically appear **smooth**, with a characteristic lobulated surface, emphasizing their benign nature. *Villous adenoma* - Villous adenomas are characterized by **frond-like projections** and have a higher risk of malignant transformation [2]. - These lesions usually occur in adults and are typically larger and more **invasive** compared to juvenile polyps [2]. *Hyperplastic polyp* - Hyperplastic polyps are small, **benign lesions** that result from epithelial overgrowth with a typical **smooth surface** [3]. - They are usually found in the colon and do not present with the distinctive features of juvenile polyps. *Peutz-Jeghers polyp* - Peutz-Jeghers polyps are associated with **Peutz-Jeghers syndrome** and exhibit a **hamartomatous** appearance, often protruding from various gastrointestinal sites [1]. - These polyps are typically more **complex** and can be found in older children and adults, differing significantly from juvenile polyps [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, p. 813. [2] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Alimentary System Disease, pp. 371-372. [3] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, pp. 811-813.
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