Gastroenterology Practice Questions

Q: Which condition is associated with the highest risk of colorectal cancer?

Familial polyposis. ***Familial polyposis*** - Familial polyposis, particularly **Familial Adenomatous Polyposis (FAP)**, is associated with a nearly **100% risk of colorectal cancer** if untreated due to the development of numerous adenomatous polyps [1]. - Patients with FAP typically require **prophylactic colectomy** due to this high risk [1]. *Crohn's disease* - While Crohn's disease does increase the risk of colorectal cancer, the risk is **lower** compared to conditions like familial polyposis. - Colorectal cancer develops more commonly in long-standing cases and with **persistence of inflammation**. *Ulcerative colitis* - Ulcerative colitis also carries an increased risk for colorectal cancer, but it requires a longer duration of disease (often **over 8 years**) to significantly increase risk. - Cancer risk in ulcerative colitis is related to the extent of **colonic involvement**, making it less severe than familial polyposis. *Infantile polyp* - Infantile polyps are benign growths occurring in children and are generally **not associated with increased colorectal cancer risk** [1]. - These polyps usually **do not progress** to malignancy and are often discovered incidentally.

Q: Capsule endoscopy is used for:

Bleeding. ***Bleeding*** - Capsule endoscopy is primarily used to investigate **obscure gastrointestinal bleeding** when upper endoscopy and colonoscopy are negative, allowing for visualization of the **small bowel** [3]. - It helps identify sources of bleeding such as **angiodysplasias**, small bowel tumors, or ulcers that are inaccessible by conventional scopes [3]. *GERD* - **Gastroesophageal reflux disease (GERD)** is typically diagnosed clinically based on symptoms and can be confirmed with **upper endoscopy** [1] or **pH monitoring**, not capsule endoscopy. - Capsule endoscopy offers no functional assessment of the lower esophageal sphincter or pH within the esophagus. *Motility disorder* - **Motility disorders** are diagnosed through specialized tests like **esophageal manometry** or **gastric emptying studies**, which assess the muscular function of the GI tract. - Capsule endoscopy provides static images and cannot evaluate the propulsive movements of the gut. *Peritoneal metastasis* - **Peritoneal metastasis** involves cancer spread to the lining of the abdomen and is often diagnosed via **cross-sectional imaging** (CT, MRI) [2] or **laparoscopy with biopsy**. - Capsule endoscopy visualizes the lumen of the bowel and cannot detect lesions outside the bowel wall, such as peritoneal implants.

Q: A patient is admitted to the hospital with complaints of nausea, vomiting, diarrhoea, and severe abdominal pain. Which of the following diagnostic tests would help confirm that the patient has bleeding from the gastrointestinal tract?

Guaiac test for occult blood.. ***Guaiac test for occult blood*** - The **Guaiac test** detects invisible amounts of blood in the stool, which is characteristic of **occult gastrointestinal bleeding** [2]. - This test is crucial when overt signs like **hematemesis** or **melena** are not yet present, but GI bleeding is suspected based on other symptoms like abdominal pain, nausea, and vomiting [3]. *Presence of hematemesis (vomiting blood)* - While **hematemesis** is a clear sign of upper GI bleeding, it is a clinical observation, not a diagnostic test [1]. - Its presence directly confirms macroscopic bleeding, but the question asks for a **diagnostic test** to confirm bleeding, particularly when it might be occult. *Observation of melena (black, tarry stools)* - **Melena** indicates black, tarry stools resulting from digested blood, strongly suggesting upper GI bleeding [2]. This is a clinical symptom, not a diagnostic test - While informative, like hematemesis, it is an overt symptom and not a diagnostic test performed in a lab or clinical setting to confirm the presence of blood. *Hematochezia (bright red blood in stool)* - **Hematochezia** signifies the passage of bright red blood from the rectum, typically indicating lower GI bleeding. This is a clinical symptom and not a diagnostic test - As with hematemesis and melena, hematochezia is a clinical manifestation of bleeding rather than a diagnostic test.

Q: Which of the following statements is true regarding ulcerative colitis?

Rectum is always involved. ***Rectum is always involved*** - In **ulcerative colitis (UC)**, inflammation invariably begins in the **rectum** and extends proximally in a continuous fashion [1]. - This **proctitis** is a hallmark feature, making rectal involvement a near-universal finding in UC [1]. *String sign of kantor positive* - The **string sign of Kantor** is typically associated with **Crohn's disease**, particularly in the terminal ileum [2]. - It refers to the severe narrowing of a bowel segment due to inflammation, which is not characteristic of UC [2]. *Skip lesions are seen* - **Skip lesions**, which are areas of normal mucosa interspersed with inflamed areas, are a classic finding in **Crohn's disease**. - Ulcerative colitis, in contrast, presents with **continuous inflammation** extending proximally from the rectum without skip lesions [1]. *Fistulas are common* - While possible, **fistulas** (abnormal connections between organs or to the skin) are much more common in **Crohn's disease** than in ulcerative colitis [3]. - UC primarily causes superficial mucosal inflammation, which rarely leads to transmural involvement and subsequent fistula formation [3].

Q: Which of the following statements about celiac disease is false?

Celiac disease is caused by a viral infection.. ### Celiac disease is caused by a viral infection - Celiac disease is an **autoimmune disorder**, not a viral infection, triggered by the ingestion of **gluten** in genetically predisposed individuals [1]. - The immune response causes inflammation and damage to the **small intestinal lining**. ### Diarrhea, Malabsorption, iron deficiency anaemia - These are **classic symptoms** and common complications of celiac disease due to the damage to the small intestinal villi, impairing nutrient absorption [1]. - **Malabsorption** leads to various deficiencies, including iron deficiency anemia [2]. ### Diagnosis requires duodenal biopsy showing villous atrophy - A definitive diagnosis typically involves an **endoscopic biopsy** of the small intestine, which reveals characteristic findings like **villous atrophy**, crypt hyperplasia, and increased intraepithelial lymphocytes [1]. - This **histological evidence** is crucial for confirming the diagnosis. ### Patients express HLA DQ2 or DQ8 haplotypes - The presence of **HLA-DQ2 or HLA-DQ8 Class II major histocompatibility complex (MHC) allelic variants** is a strong genetic predisposition for celiac disease [1]. - While necessary, these **haplotypes** are not sufficient for diagnosis, as many individuals with these genes never develop the condition.

Q: A middle-aged woman presents to her physician with fatigue, pruritus, and steatorrhea. Further studies demonstrate primary biliary cholangitis and the presence of antimitochondrial antibodies. If left untreated, this patient is also at increased risk of developing which of the following?

Increased serum cholesterol levels due to cholestasis. ***Markedly increased serum cholesterol*** - Patients with **primary biliary cholangitis** (PBC) often have **cholestasis** leading to elevated cholesterol levels due to impaired bile salt excretion. - Untreated PBC can progress, increasing the risk of **hyperlipidemia**, including markedly elevated serum cholesterol levels, evidenced by xanthomatous deposits [1]. *Markedly increased serum pyruvic acid* - Increased serum pyruvic acid typically indicates issues with **glycolysis** or **liver metabolism**, which are not primary complications of PBC. - This condition is more associated with **lactic acidosis** or certain genetic disorders, not directly related to the severe cholestatic picture seen in this patient. *Markedly decreased PaO2* - Markedly decreased **PaO2** suggests respiratory failure or severe lung disease, not a complication of cholestatic liver disease. - This does not typically correlate with PBC, where the main concerns are liver function and metabolism, not oxygenation. *Markedly decreased serum uric acid* - Decreased serum uric acid is typically seen in conditions like **chronic liver disease**, but it is not a hallmark of PBC or its complications. - PBC is more associated with **autoimmune disorders** [1] rather than metabolic alterations affecting uric acid levels in this context.

Q: Which of the following conditions is NOT typically associated with H. pylori infection?

Fundal atrophic gastritis. ***Fundal atrophic gastritis*** - While *H. pylori* can cause multifocal atrophic gastritis impacting the antrum and body, **fundal atrophic gastritis** typically refers to **autoimmune atrophic gastritis** which spares the antrum [2] and is not directly caused by *H. pylori*. - Autoimmune atrophic gastritis is characterized by antibodies to **parietal cells** and **intrinsic factor**, leading to vitamin B12 deficiency [2]. *Gastric ulcer* - *H. pylori* infection is a leading cause of **gastric ulcers**, often by inducing chronic inflammation that compromises the mucosal protective barrier [4]. - The bacteria colonize the gastric antrum, contributing to local inflammation and increased acid production, leading to ulcer formation [1]. *Duodenal ulcer* - The vast majority of **duodenal ulcers** are associated with *H. pylori* infection, which is a major factor in their pathogenesis [1]. - *H. pylori* colonization of the gastric antrum can lead to increased gastrin release, elevated acid secretion, and resultant duodenal mucosal injury [1]. *Gastric lymphoma* - Specifically, **Mucosa-Associated Lymphoid Tissue (MALT) lymphoma** of the stomach is strongly linked to chronic *H. pylori* infection [3]. - Eradication of *H. pylori* can lead to regression of low-grade gastric MALT lymphoma in a significant number of cases [3].

Q: In which condition are Anti-Gliadin antibodies typically detectable?

Celiac disease (gluten sensitivity). ***Celiac disease*** - The presence of **Anti-Gliadin antibodies** is a hallmark of celiac disease, which is an autoimmune disorder triggered by gluten ingestion [1]. - These antibodies indicate an inappropriate immune response to gluten, leading to **intestinal damage** and malabsorption [1][2]. *Whipple's disease* - Characterized by **trophic intestinal lesions**, but not associated with **Anti-Gliadin antibodies**; instead, it involves a different pathogenesis linked to the bacterium *Tropheryma whipplei*. - Symptoms include **malabsorption**, **weight loss**, and systemic issues like arthritis and CNS symptoms, unrelated to gluten. *Tropical sprue* - This condition is caused by **nutritional deficiencies**, particularly due to malabsorption in tropical regions, without a specific autoimmune response to gluten seen in celiac disease. - Typically presents with **diarrhea** and **weight loss**, but **Anti-Gliadin antibodies** are not typically detectable. *Intestinal lymphoma* - While intestinal lymphoma may occur in patients with celiac disease as a complication, it does not produce **Anti-Gliadin antibodies** as part of its pathophysiology. - The presence of these antibodies does not indicate lymphoma; the condition usually involves a more complex array of symptoms and does not directly relate to gluten sensitivity.

Q: Plummer-Vinson syndrome is characterized by all of the following except:

Megaloblastic anemia. ***Megaloblastic anemia*** - Plummer-Vinson syndrome is associated with **iron deficiency anemia**, not megaloblastic anemia [2]. - **Megaloblastic anemia** is caused by deficiencies in **vitamin B12** or **folate**, leading to impairment in DNA synthesis [1]. *Glossitis* - **Glossitis**, or inflammation of the tongue, is a common symptom of Plummer-Vinson syndrome due to **iron deficiency**. - This symptom can contribute to the difficulty in swallowing experienced by patients. *Iron deficiency anemia* - **Iron deficiency anemia** is a primary characteristic of Plummer-Vinson syndrome, leading to various symptoms [2]. - The anemia is thought to contribute to the formation of esophageal webs which cause dysphagia. *Dysphagia* - **Dysphagia**, or difficulty swallowing, is a hallmark symptom of Plummer-Vinson syndrome, usually caused by **esophageal webs**. - These webs are thin mucosal folds that form in the upper esophagus, obstructing **food passage**.

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.

Question 1

Which condition is associated with the highest risk of colorectal cancer?

Accepted Answer

Familial polyposis

Answer

Crohn's disease

Answer

Ulcerative colitis

Answer

Infantile polyp

Question 2

Capsule endoscopy is used for:

Accepted Answer

Bleeding

Answer

GERD

Answer

Motility disorder

Answer

Peritoneal metastasis

Question 3

A patient is admitted to the hospital with complaints of nausea, vomiting, diarrhoea, and severe abdominal pain. Which of the following diagnostic tests would help confirm that the patient has bleeding from the gastrointestinal tract?

Accepted Answer

Guaiac test for occult blood.

Answer

Observation of melena (black, tarry stools)

Answer

Presence of hematemesis (vomiting blood)

Answer

Hematochezia (bright red blood in stool)

Question 4

Which of the following statements is true regarding ulcerative colitis?

Accepted Answer

Rectum is always involved

Answer

String sign of kantor positive

Answer

Skip lesions are seen

Answer

Fistulas are common

Question 5

Which of the following statements about celiac disease is false?

Accepted Answer

Celiac disease is caused by a viral infection.

Answer

Diagnosis requires duodenal biopsy showing villous atrophy

Answer

Diarrhea, Malabsorption, iron deficiency anaemia

Answer

Patients express HLA DQ2 or DQ8 haplotypes

Question 6

A middle-aged woman presents to her physician with fatigue, pruritus, and steatorrhea. Further studies demonstrate primary biliary cholangitis and the presence of antimitochondrial antibodies. If left untreated, this patient is also at increased risk of developing which of the following?

Accepted Answer

Increased serum cholesterol levels due to cholestasis

Answer

Severe respiratory failure

Answer

Decreased serum uric acid levels

Answer

Increased serum pyruvic acid levels

Question 7

Which of the following conditions is NOT typically associated with H. pylori infection?

Accepted Answer

Fundal atrophic gastritis

Answer

Gastric ulcer

Answer

Duodenal ulcer

Answer

Gastric lymphoma

Question 8

In which condition are Anti-Gliadin antibodies typically detectable?

Accepted Answer

Celiac disease (gluten sensitivity)

Answer

Tropical sprue (malabsorption syndrome)

Answer

Intestinal lymphoma (malignancy)

Answer

Whipple's disease (systemic infection)

Question 9

Plummer-Vinson syndrome is characterized by all of the following except:

Accepted Answer

Megaloblastic anemia

Answer

Iron deficiency anemia

Answer

Dysphagia

Answer

Glossitis

Question 10

Best test for small intestine malabsorption of carbohydrates is

Accepted Answer

D-Xylose test

Answer

Lund meal test

Answer

Follacin test

Answer

Schilling test

Gastroenterology — MCQs

Gastroenterology — MCQs

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