Gastroenterology Practice Questions

Q: Which of the following statements accurately describes the properties of lithogenic bile?

Decreased bile acid and cholesterol ratio. Decreased bile acid and cholesterol ratio - Lithogenic bile, a precursor to **cholesterol gallstones**, is characterized by a relatively **lower concentration of bile acids** compared to cholesterol [2]. - This imbalance leads to the supersaturation of bile with cholesterol, causing it to precipitate and form crystals [1]. *Decreased cholesterol only* - This statement is incorrect because decreased cholesterol alone would typically make bile **less lithogenic**, reducing the risk of cholesterol crystallization. - The problem in lithogenic bile is often an **excess of cholesterol relative to solubilizing agents**, not a general decrease in cholesterol [2]. *Increased bile acid and cholesterol ratio* - An **increased bile acid to cholesterol ratio** would mean there are more bile acids available to keep cholesterol in solution. - This would make the bile **less lithogenic** or even protective against gallstone formation [2]. *Equal bile acid and cholesterol ratio* - While exact ratios vary, an equal ratio would likely not be the condition for lithogenic bile, as bile acids typically need to be in **higher proportions** to effectively emulsify and solubilize cholesterol [2]. - The critical factor for lithogenicity is the **imbalance leading to supersaturation**, not necessarily an equal ratio.

Q: Best test for small intestine malabsorption of carbohydrates is

D-Xylose test. ***D-Xylose test*** - The **D-xylose absorption test** is specifically designed to assess the absorptive function of the **small intestine** for **carbohydrates**. - D-xylose is a **monosaccharide** that does not require enzymatic digestion before absorption, making it an excellent indicator of mucosal integrity. *Lund meal test* - The **Lundh test** is used to evaluate **exocrine pancreatic function** by measuring the release of digestive enzymes after a standardized meal [1]. - It is not primarily used to assess small intestine carbohydrate absorption. *Schilling test* - The **Schilling test** is specifically used to diagnose **vitamin B12 (cobalamin) malabsorption** and to differentiate its causes, such as pernicious anemia or intrinsic factor deficiency [2]. - It does not directly assess carbohydrate absorption. *Follacin test* - This term is likely a misspelling or an unfamiliar test name in the context of malabsorption. - **Folate (folic acid)** levels can be measured to assess nutritional status [3], but there isn't a widely recognized "follacin test" for carbohydrate malabsorption.

Q: Which of the following is NOT a cause of secretory diarrhea?

Inflammatory bowel disease (IBD). ***Inflammatory bowel disease (IBD)*** - IBD, which includes **Crohn's disease** and **ulcerative colitis**, primarily causes **inflammatory diarrhea**, characterized by damage to the intestinal lining and often with presence of blood or pus [1]. - While fluid secretion can occur, the predominant mechanism is altered absorption due to inflammation and mucosal damage, rather than active secretion. *Celiac disease* - Celiac disease causes **malabsorptive diarrhea** due to immune-mediated damage to the small intestine villi upon gluten ingestion [1]. - This leads to impaired absorption of nutrients and water, rather than active secretion [4]. *Lactose intolerance* - Lactose intolerance results in **osmotic diarrhea**, where undigested lactose in the gut draws water into the lumen [2]. - It does not involve active fluid secretion by the intestinal cells but rather an osmotic effect [3]. *Gastrinoma* - A gastrinoma is a neuroendocrine tumor that secretes excessive **gastrin**, leading to **Zollinger-Ellison syndrome**. - High gastrin levels cause increased gastric acid secretion, which overwhelms the intestine's neutralizing capacity, leading to inactivation of pancreatic enzymes and mucosal damage, all contributing to **secretory diarrhea**.

Q: Which of the following drugs is least effective or not typically used in the treatment of ulcerative colitis?

Methotrexate. ***Methotrexate*** - **Methotrexate** is not a primary or highly effective treatment for ulcerative colitis compared to other immunomodulators. - While it sees use in Crohn's disease, its efficacy in **ulcerative colitis** is limited and generally not recommended. *Corticosteroids* - **Corticosteroids** are highly effective for inducing remission in moderate to severe ulcerative colitis due to their potent anti-inflammatory effects. - They are used for short-term control of flares but not for long-term maintenance due to significant side effects. *Azathioprine* - **Azathioprine** is an effective immunomodulator used for maintaining remission in ulcerative colitis, often as a steroid-sparing agent. - It works by suppressing the immune system over time, reducing the frequency and severity of disease flares. *Sulfasalazine* - **Sulfasalazine** is a 5-aminosalicylate (5-ASA) drug that is a cornerstone of treatment for mild to moderate ulcerative colitis. - It works topically in the colon to reduce inflammation and is used for both induction and maintenance of remission.

Q: Tenesmus occurs in lesions of the colon.

Sigmoid colon. ***Sigmoid colon*** - Lesions in the **sigmoid colon** are most commonly associated with **tenesmus** because of its proximity to the rectum and its role in stool storage and defecation. - Inflammation or obstruction in this region can trigger a constant urge to defecate, even when the bowel is empty. *Lesions on the right side of the colon* - **Right-sided colon lesions** are typically associated with symptoms like **anemia**, occult bleeding, and vague abdominal pain due to their larger luminal diameter, rather than tenesmus. - The right colon is primarily involved in **water and electrolyte absorption**, and lesions here don't usually cause the sensation of incomplete evacuation linked to tenesmus. *Lesions in the descending colon* - While the **descending colon** is involved in stool transit, lesions here are less likely to cause prominent tenesmus compared to the sigmoid colon. - Symptoms usually involve **changes in bowel habits**, abdominal pain, or blood in stool, but typically without the persistent urgency characteristic of tenesmus. *Ileal lesions* - **Ileal lesions** (in the small intestine) are associated with symptoms like malabsorption, abdominal pain, and diarrhea [2]. - The ileum is located far from the rectum and anal canal, so it does not directly influence the sensation of **incomplete defecation** or tenesmus [1].

Q: What is the most common cause of lower gastrointestinal bleeding?

Angiodysplasia. ***Angiodysplasia*** - Angiodysplasia is the **most frequent cause** of lower gastrointestinal bleeding, particularly in **elderly patients**, and often presents as painless, recurrent bleeding [1]. - These are **small vascular malformations** that can be found throughout the GI tract, most commonly in the right colon [1]. *Diverticulitis* - While **diverticular disease** (diverticulosis) is a common cause of lower GI bleeding, **diverticulitis** itself (inflammation of diverticula) typically presents with abdominal pain and fever, and bleeding is less common. - Bleeding from diverticulosis is usually **painless** and can be substantial, but **diverticulitis** is not the most common cause of bleeding overall. *Anal fissure* - An anal fissure is a small tear in the lining of the anus, causing **bright red bleeding** on toilet paper or stool, but the volume of blood is usually **minimal** and not considered a major cause of significant lower GI bleeding. - It is typically associated with **severe pain during defecation**, which is not implied in a general question about the most common cause of lower GI bleeding. *Colorectal carcinoma* - Colorectal carcinoma can cause chronic, **occult bleeding** or intermittent, small amounts of **frank blood** in the stool [1]. - While it's a serious cause of GI bleeding, it is **not the most common** cause in the general population compared to angiodysplasia or diverticulosis (when considered broadly) [1].

Q: Volcano ulcers in the esophagus are seen in

Herpetic esophagitis. ***Herpetic esophagitis*** - **Herpes simplex virus (HSV)** esophagitis is characterized by multiple, small **volcano-like ulcers** with a raised border and central erosion. - These ulcers are typically formed by the rupture of HSV-induced vesicles, commonly found in **immunocompromised patients**. *Candida esophagitis* - This condition is characterized by **white, adherent plaques or pseudomembranes** on the esophageal mucosa, not discrete volcano ulcers. - It is caused by **Candida albicans** and often presents with dysphagia and odynophagia, particularly in immunocompromised individuals. *Aphthous ulcer in Crohn's* - **Aphthous ulcers** in Crohn's disease are typically found in the mouth, but can occur in the esophagus, though they are usually **solitary, deep craters** with undermined edges rather than volcano-like lesions. - These ulcers are associated with **granulomatous inflammation** and tend to be more painful and chronic. *HIV esophagitis* - **HIV-associated esophageal ulcers** are often large, shallow, and discrete, but they do not typically present with the classic "volcano" morphology. - These ulcers are primarily thought to be related to **idiopathic processes** or other opportunistic infections, not specifically "volcano" ulcers.

Q: All are true regarding familial adenomatous polyposis except which of the following?

Autosomal recessive. ***Autosomal recessive*** - **Familial adenomatous polyposis (FAP)** is inherited in an **autosomal dominant** pattern, not autosomal recessive. - It is caused by a germline mutation in the **APC gene** on chromosome 5q21-q22. *Associated endocrine involvement can be present* - **Gardner syndrome**, a variant of FAP, is associated with **extracolonic manifestations**, including benign osteomas, desmoid tumors, and epidermal cysts, which can be linked to endocrine disturbances [1]. - Other manifestations can include **adrenal adenomas** and **thyroid cancer**, reflecting potential widespread systemic involvement. *Multiple duodenal polyps* - FAP is characterized by the development of numerous **adenomatous polyps** throughout the gastrointestinal tract, especially in the **colon and rectum**. - **Duodenal polyps**, particularly in the periampullary region, are common and can malignant change, requiring regular surveillance [1]. *More > 100 polyps in the colon* - The defining feature of FAP is the presence of **hundreds to thousands of colorectal adenomatous polyps**, often exceeding 100. - These polyps have a nearly **100% risk of malignant transformation** into colorectal cancer if left untreated.

Question 1

Which of the following statements accurately describes the properties of lithogenic bile?

Accepted Answer

Decreased bile acid and cholesterol ratio

Answer

Decreased cholesterol only

Answer

Increased bile acid and cholesterol ratio

Answer

Equal bile acid and cholesterol ratio

Question 2

Best test for small intestine malabsorption of carbohydrates is

Accepted Answer

D-Xylose test

Answer

Lund meal test

Answer

Follacin test

Answer

Schilling test

Question 3

Which of the following statements about Peutz-Jeghers syndrome is false?

Accepted Answer

Peutz-Jeghers syndrome is characterized by hyperplastic polyps

Answer

Polypectomy during colonoscopy is the treatment of choice.

Answer

The most common site for polyps is the small intestine.

Answer

Peutz-Jeghers syndrome is characterized by hamartomatous polyps.

Question 4

Which of the following is NOT a cause of secretory diarrhea?

Accepted Answer

Inflammatory bowel disease (IBD)

Answer

Lactose intolerance

Answer

Gastrinoma

Answer

Celiac disease

Question 5

Which of the following drugs is least effective or not typically used in the treatment of ulcerative colitis?

Accepted Answer

Methotrexate

Answer

Corticosteroids

Answer

Azathioprine

Answer

Sulfasalazine

Question 6

Tenesmus occurs in lesions of the colon.

Accepted Answer

Sigmoid colon

Answer

Lesions on the right side of the colon

Answer

Lesions in the descending colon

Answer

Ileal lesions

Question 7

What is the most common cause of lower gastrointestinal bleeding?

Accepted Answer

Angiodysplasia

Answer

Anal fissure

Answer

Diverticulitis

Answer

Colorectal carcinoma

Question 8

Volcano ulcers in the esophagus are seen in

Accepted Answer

Herpetic esophagitis

Answer

Candida esophagitis

Answer

HIV esophagitis

Answer

Aphthous ulcer in Crohn's

Question 9

All are true regarding familial adenomatous polyposis except which of the following?

Accepted Answer

Autosomal recessive

Answer

Associated endocrine involvement can be present

Answer

Multiple duodenal polyps

Answer

More > 100 polyps in the colon

Question 10

Which of the following statements about Wilson's disease is false?

Accepted Answer

Urinary copper excretion < 100 micrograms/day

Answer

Autosomal recessive

Answer

Serum ceruloplasmin level < 20 mg/dl

Answer

Zinc acetate is used as maintenance therapy

Gastroenterology — MCQs

Gastroenterology — MCQs

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