Gastroenterology Practice Questions

Q: A 25-year-old obese woman who denies any history of alcohol abuse presents with severe abdominal pain radiating to the back. Laboratory results indicate an increase in serum amylase and lipase, with a marked decrease in calcium. Which of the following likely has caused this condition?

Cholelithiasis. **Cholelithiasis** - **Obesity** is a significant risk factor for gallstone formation [2], which can obstruct the pancreatic duct and lead to **pancreatitis** [1]. - The classic presentation of severe abdominal pain radiating to the back, elevated **amylase** and **lipase**, and **hypocalcemia** (due to fat saponification in severe pancreatitis) is highly consistent with pancreatitis secondary to gallstones [1]. *Abetalipoproteinemia* - This is a rare genetic disorder characterized by the inability to synthesize apolipoprotein B, leading to severe **malabsorption** and **neurological deficits**, not pancreatitis. - While it involves lipid abnormalities, it typically presents with steatorrhea, growth failure, and ataxia, not acute abdominal pain. *Cystic fibrosis* - Individuals with **cystic fibrosis** can develop pancreatic insufficiency and chronic pancreatitis due to thick secretions blocking pancreatic ducts, but **acute severe pancreatitis with hypocalcemia** is less typical as an initial presentation in a 25-year-old without a prior diagnosis. - Features like **recurrent respiratory infections** and **failure to thrive** would usually precede or accompany pancreatic issues. *Alcohol* - Although **alcohol abuse** is a very common cause of pancreatitis, the patient explicitly **denies any history of alcohol abuse**, making this etiology less likely in this specific case. - Clinically, alcohol-induced pancreatitis presents similarly, but the absence of positive history rules it out as the primary cause.

Q: Toxic megacolon is seen in -

Chronic nonspecific ulcerative colitis. ***Chronic nonspecific ulcerative colitis*** - **Toxic megacolon** is a severe complication of **ulcerative colitis**, characterized by acute toxic symptoms and **colonic dilation**. [1] - It results from inflammation extending into the **muscularis propria**, leading to colonic dysfunction and paralysis. *Crohn's disease* - While Crohn's disease can affect any part of the gastrointestinal tract and cause severe inflammation, **toxic megacolon is rarer** in Crohn's than in ulcerative colitis. [1] - Crohn's disease is more commonly associated with **strictures**, **fistulas**, and **skip lesions**. [1] *Colonic diverticulosis* - **Colonic diverticulosis** refers to the presence of small outpouchings in the colon wall, which can become inflamed (diverticulitis). - It does not typically lead to direct **toxic megacolon**, although severe diverticulitis can rarely cause a localized form of colonic distension. *Hamartomatous polyp* - A **hamartomatous polyp** is a non-neoplastic growth that results from an abnormal mixture of normal tissues. - These polyps are associated with various syndromes (e.g., Peutz-Jeghers syndrome) but are **not a cause of toxic megacolon**.

Q: Portocaval encephalopathy is treated with

Lactulose. ***Lactulose*** - **Lactulose** is a non-absorbable disaccharide that is metabolized by colonic bacteria, producing organic acids that **lower colonic pH**. - This acidic environment promotes the conversion of ammonia (NH3) to the non-absorbable ammonium ion (NH4+), which is then trapped in the colon and excreted in feces, thereby **reducing systemic ammonia levels**. [1] *Diuretics* - While diuretics are used in liver disease to manage **fluid retention** and **ascites**, they do not directly treat the underlying encephalopathy by removing nitrogenous waste. - In fact, some diuretics (e.g., loop diuretics) can exacerbate encephalopathy by causing **hypokalemia** and **alkalosis**, which favor the diffusion of ammonia into the central nervous system. *Large amount of amino acids* - A large intake of regular dietary **amino acids**, particularly aromatic amino acids, can actually worsen hepatic encephalopathy by increasing the production of nitrogenous waste products. [1] - In some cases, specialized amino acid formulations rich in **branched-chain amino acids** (BCAAs) are used, but a large, non-specific amount of amino acids is counterproductive. *Emergency shunt surgery* - Emergency shunt surgery is not a primary treatment for portosystemic encephalopathy and is generally reserved for managing **acute variceal bleeding** that cannot be controlled endoscopically. - While shunts can prevent recurrent variceal bleeding, they can also **worsen encephalopathy** by diverting more portal blood directly into the systemic circulation, bypassing the liver and increasing the exposure of the brain to toxins. [1]

Q: A 35 year old male presenting with recurrent episodes of abdominal pain, jaundice and fatigue underwent MRCP (shown below). What is the most likely diagnosis?

Primary Sclerosing Cholangitis. ***Primary Sclerosing Cholangitis*** - The MRCP image showing **multiple strictures** and dilatations within the intrahepatic and extrahepatic bile ducts (often described as a **"beaded" appearance**), along with the patient's symptoms of recurrent abdominal pain, jaundice, and fatigue, are classic findings for Primary Sclerosing Cholangitis (PSC). - PSC is a chronic cholestatic liver disease, often associated with **inflammatory bowel disease (IBD)**, particularly ulcerative colitis, and more commonly affects young to middle-aged men. *Oriental Cholangitis* - This condition (also known as recurrent pyogenic cholangitis) is characterized by **intrahepatic bile duct stones** and recurrent bacterial cholangitis, particularly prevalent in East Asia. - While it involves strictures and dilations, the primary driver is often stones and infection, and the demographic and typical MRCP findings are different from the diffuse "beading" seen in PSC. *Primary Biliary Cirrhosis* - Primary Biliary Cirrhosis (PBC) primarily affects the **small intrahepatic bile ducts** and is an autoimmune disease mainly seen in middle-aged women. - While it causes chronic cholestasis and can lead to cirrhosis, the characteristic imaging findings on MRCP as seen here (large duct involvement with diffuse stricturing and beading) are not typical for PBC. *Caroli's Disease* - Caroli's disease is a rare congenital disorder characterized by **segmental cystic dilatation of the intrahepatic bile ducts**. - The imaging findings would show sac-like or cystic dilations of the bile ducts, which is distinct from the diffuse, multifocal strictures and beading pattern observed in the provided MRCP.

Q: On esophageal manometry, spastic contractions in the esophageal body with a distal contractile integral (DCI) >8000 mmHg*s*cm are diagnostic of:

Type III achalasia. ***Type III achalasia*** - This diagnosis is characterized by the presence of **spastic contractions** in the esophageal body, specifically with a **distal contractile integral (DCI) greater than 8000 mmHg*s*cm**, alongside the classic features of achalasia (impaired LES relaxation and absent peristalsis) [1]. - The elevated DCI reflects the **premature and simultaneous contractions** that are hallmark of this subtype, distinguishing it from other motility disorders [1]. *Jackhammer esophagus* - While it also involves very strong esophageal contractions (**high DCI**), jackhammer esophagus (also known as hypercontractile esophagus) does **not present with impaired LES relaxation or absent peristalsis** as seen in achalasia. - The defining feature of jackhammer esophagus is **multiple rapid swallows** (MRS) that induce simultaneous contractions, often with very high vigor. *Type II achalasia* - This type of achalasia is defined by **pan-esophageal pressurization** in more than 20% of swallows, along with impaired LES relaxation and absent peristalsis. - Unlike Type III, it does **not show the spastic hypercontractile activity** in the esophageal body revealed by a very high DCI. *Type I achalasia* - This is the classic form of achalasia characterized by **absent esophageal peristalsis** and **impaired lower esophageal sphincter (LES) relaxation**, without significant esophageal pressurization or spastic contractions [1]. - It represents the most common subtype and lacks the **high DCI spastic activity** seen in Type III achalasia.

Q: All of the following are true about ulcerative colitis except:

Steroid dependent cases need surgery. ***Steroid dependent cases need surgery*** - While **steroid dependency** in ulcerative colitis (UC) indicates a need for alternative or escalate medications, it does not automatically necessitate surgery [1]. - Many steroid-dependent patients can be managed effectively with **immunomodulators** or **biologic therapies**, avoiding surgery. *Surgery is required in a subset of severe cases.* - **Severe ulcerative colitis** that is refractory to medical therapy, or complicated by toxic megacolon, perforation, or severe bleeding, often requires surgical intervention [1]. - This statement is true, as surgery can be curative for UC by removing the affected colon [1]. *Extra-intestinal problems of UC are managed medically* - **Extra-intestinal manifestations** of ulcerative colitis, such as arthritis, skin lesions (erythema nodosum), and eye inflammation (uveitis), are typically managed with medications specific to those conditions, often in conjunction with UC treatment [1], [2]. - This statement is true, as these manifestations rarely require surgical intervention themselves. *The highest risk of UC requiring surgery in 1st year* - The risk of surgery in ulcerative colitis is indeed highest in the **first year after diagnosis**, particularly for patients presenting with severe disease. - This initial period often determines the disease course and responsiveness to medical treatment.

Q: Which is the most common site of gastrinoma in MEN 1 syndrome?

Duodenum. ***Duodenum*** - In **MEN 1 syndrome**, gastrinomas (gastrin-secreting tumors) are most commonly found in the **duodenum**, often multiple and small. - This location accounts for a significant majority of gastrinomas, particularly in patients with **Zollinger-Ellison syndrome (ZES)** associated with MEN 1. *Stomach* - While gastrinomas can occasionally be found in the stomach, this is a **much less common site** compared to the duodenum, especially in the context of MEN 1 syndrome. - Gastric gastrinomas are typically associated with conditions like **atrophic gastritis** and **pernicious anemia**, leading to G-cell hyperplasia and often hypergastrinemia, but tend to be less aggressive. *Ileum* - The **ileum** is an **uncommon site** for gastrinomas; these types of neuroendocrine tumors (NETs) are rarely found there. - NETs in the ileum are more typically associated with the secretion of other hormones, such as **serotonin**, leading to carcinoid syndrome, rather than gastrin. *Jejunum* - Gastrinomas in the **jejunum** are also **rare**, similar to the ileum. - While neuroendocrine tumors can arise throughout the small bowel, the jejunum is not a typical or primary location for gastrin-producing tumors within the context of **MEN 1**.

Q: What is the differentiating feature between irritable bowel syndrome and inflammatory bowel disease?

Stool calprotectin. ***Stool calprotectin*** - **Stool calprotectin** is a reliable biomarker used to differentiate between **Inflammatory Bowel Disease (IBD)** and **Irritable Bowel Syndrome (IBS)**. It's a protein released by neutrophils during intestinal inflammation. - Elevated levels of **calprotectin** strongly suggest **mucosal inflammation** characteristic of IBD (Crohn's disease or ulcerative colitis), while normal levels are typical in IBS, which lacks inflammation [1]. *pain in abdomen* - **Abdominal pain** is a common symptom in both IBS and IBD. In IBS, it's often linked to altered bowel habits and is a key diagnostic criterion [1]. - In IBD, abdominal pain is typically due to inflammation, strictures, or abscesses, but its presence alone does not differentiate the conditions . *Diarrhoea* - **Diarrhea** is a prominent symptom in both IBS and IBD. In IBS, it can be a predominant feature (IBS-D), often associated with urgency [1]. - In IBD, diarrhea is usually due to inflammation disrupting normal absorption and secretion, and it may contain blood or mucus . *Mucus in stools* - The presence of **mucus in stools** can occur in both IBS and IBD. In IBS, it's often present without blood and is generally considered part of altered bowel function [1]. - In IBD, mucus in stools, particularly when accompanied by blood, strongly suggests active intestinal inflammation and mucosal damage .

Q: What is the Child-Pugh class for a patient who has a serum bilirubin of 2.5 mg/dL, serum albumin of 3 g/dL, INR of 2, mild ascites, but no encephalopathy?

Child-Pugh Class B. ***Child-Pugh Class B*** - A serum bilirubin of **2.5 mg/dL** (2 points), serum albumin of **3 g/dL** (2 points), INR of **2** (2 points), and mild ascites (2 points), with no encephalopathy (1 point), sums up to a total of 9 points, which falls into the range for **Child-Pugh Class B** (7-9 points) [1]. - This class indicates **moderate hepatic dysfunction** and is characterized by a higher risk of complications and mortality compared to Class A. *Child-Pugh Class A* - This class is assigned for a total score of **5-6 points**, indicating **well-compensated hepatic disease**. - The patient's total score of 9 points exceeds the threshold for Class A, suggesting more significant liver impairment. *Child-Pugh Class D* - There is no Child-Pugh Class D; the classification system only includes classes A, B, and C. - This option is therefore incorrect based on the established Child-Pugh scoring system. *Child-Pugh Class C* - This class corresponds to a total score of **10-15 points**, indicative of **severe hepatic decompensation**. - The patient's calculated score of 9 points is below the minimum required for Child-Pugh Class C.

Question 1

A 25-year-old obese woman who denies any history of alcohol abuse presents with severe abdominal pain radiating to the back. Laboratory results indicate an increase in serum amylase and lipase, with a marked decrease in calcium. Which of the following likely has caused this condition?

Accepted Answer

Cholelithiasis

Answer

Abetalipoproteinemia

Answer

Cystic fibrosis

Answer

Alcohol

Question 2

Toxic megacolon is seen in -

Accepted Answer

Chronic nonspecific ulcerative colitis

Answer

Crohn's disease

Answer

Colonic diverticulosis

Answer

Hamartomatous polyp

Question 3

Portocaval encephalopathy is treated with

Accepted Answer

Lactulose

Answer

Diuretics

Answer

Large amount of amino acids

Answer

Emergency shunt surgery

Question 4

A 35 year old male presenting with recurrent episodes of abdominal pain, jaundice and fatigue underwent MRCP (shown below). What is the most likely diagnosis?

Accepted Answer

Primary Sclerosing Cholangitis

Answer

Oriental Cholangitis

Answer

Primary Biliary Cirrhosis

Answer

Carolis Disease

Question 5

On esophageal manometry, spastic contractions in the esophageal body with a distal contractile integral (DCI) >8000 mmHg*s*cm are diagnostic of:

Accepted Answer

Type III achalasia

Answer

Jackhammer esophagus

Answer

Type II achalasia

Answer

Type I achalasia

Question 6

True statement regarding upper GI bleeds:

Accepted Answer

The most common cause of upper GI bleeds is peptic ulcer disease, not variceal bleeding.

Answer

Upper GI bleeding is defined as bleeding originating proximal to the ampulla of Vater, not the ligament of Treitz

Answer

Endoscopic banding is the first-line treatment for all types of upper GI bleeding

Answer

Rockall score is primarily used for immediate treatment decisions rather than risk stratification

Question 7

All of the following are true about ulcerative colitis except:

Accepted Answer

Steroid dependent cases need surgery

Answer

Surgery is required in a subset of severe cases.

Answer

Extra-intestinal problems of UC are managed medically

Answer

The highest risk of UC requiring surgery in 1st year

Question 8

Which is the most common site of gastrinoma in MEN 1 syndrome?

Accepted Answer

Duodenum

Answer

Stomach

Answer

Ileum

Answer

Jejunum

Question 9

What is the differentiating feature between irritable bowel syndrome and inflammatory bowel disease?

Accepted Answer

Stool calprotectin

Answer

pain in abdomen

Answer

Diarrhoea

Answer

Mucus in stools

Question 10

What is the Child-Pugh class for a patient who has a serum bilirubin of 2.5 mg/dL, serum albumin of 3 g/dL, INR of 2, mild ascites, but no encephalopathy?

Accepted Answer

Child-Pugh Class B

Answer

Child-Pugh Class A

Answer

Child-Pugh Class D

Answer

Child-Pugh Class C

Gastroenterology — MCQs

Gastroenterology — MCQs

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