USMLE Step 2 Quiz
Practice Pancreatic And Biliary Disorders in USMLE Step 2 with focused quiz questions that help you check what you know, review explanations, and build confidence with test-style prompts.
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A 60-year-old man is admitted to the ICU with acute pancreatitis. Over the first 72 hours, his BUN has risen to 45 mg/dL, he has developed a pleural effusion, and he requires vasopressors to maintain his blood pressure. He is intubated for hypoxemic respiratory failure. His initial CT scan showed pancreatic inflammation and peripancreatic fluid collections.
Which of the following is the most appropriate next step to assess for a severe complication of his pancreatitis?
This quiz focuses on Pancreatic And Biliary Disorders, giving you a quick way to practice the rules, question types, and explanations that matter most for USMLE Step 2.
Try each quiz question before looking at the correct answer. Use the explanations to review missed ideas, then come back to similar questions until the pattern feels familiar.
A 60-year-old man is admitted to the ICU with acute pancreatitis. Over the first 72 hours, his BUN has risen to 45 mg/dL, he has developed a pleural effusion, and he requires vasopressors to maintain his blood pressure. He is intubated for hypoxemic respiratory failure. His initial CT scan showed pancreatic inflammation and peripancreatic fluid collections.
Which of the following is the most appropriate next step to assess for a severe complication of his pancreatitis?
Explanation: This patient has multiple signs of severe pancreatitis (high BUN, shock, respiratory failure) and is at high risk for developing necrotizing pancreatitis. A contrast-enhanced CT (CECT) scan performed 72 hours or more after symptom onset is the gold standard for assessing the extent of pancreatic necrosis. The contrast helps differentiate viable, perfused pancreatic tissue from non-perfused, necrotic tissue, which is a key prognostic factor and guides further management, such as the need for antibiotics or drainage if infection develops.
A 38-year-old man with a history of alcohol-induced acute pancreatitis 5 weeks ago presents with early satiety, mild abdominal pain, and a palpable epigastric mass. He has not had a fever or chills. His vital signs are stable. Laboratory studies show a normal white blood cell count and a lipase level that is mildly elevated. A CT scan of the abdomen reveals a well-circumscribed, encapsulated fluid collection adjacent to the pancreas.
What is the most likely diagnosis?
Explanation: A pancreatic pseudocyst is a well-encapsulated collection of pancreatic fluid that is a common complication of acute pancreatitis, typically developing 4 or more weeks after the initial episode. The presentation with early satiety, pain, and a palpable mass, along with the CT findings of a mature, encapsulated fluid collection, is classic for a pseudocyst. An abscess would present with more systemic signs of infection (fever, high WBC). Adenocarcinoma is less likely in this age group and clinical context. Walled-off necrosis contains necrotic debris in addition to fluid and is a later complication of necrotizing pancreatitis.
A 48-year-old woman with chronic pancreatitis due to an idiopathic cause presents with debilitating mid-epigastric pain that has not responded to lifestyle modifications, pancreatic enzyme replacement therapy, and scheduled non-opioid analgesics. She has required multiple hospitalizations for pain control.
Which of the following is the most appropriate next step in managing her pain?
Explanation: In patients with chronic pancreatitis and intractable pain refractory to conservative management (lifestyle changes, enzyme replacement, non-opioids), the next step is often interventional. Endoscopic therapy (e.g., stenting of a pancreatic duct stricture) or a celiac plexus block/neurolysis can provide significant pain relief. While opioids may be used, they are generally reserved for breakthrough pain or when other options fail due to the risk of dependence. Total pancreatectomy is a last resort with high morbidity. A liquid diet is not a long-term solution for chronic pain management.
A 70-year-old man undergoes an abdominal ultrasound for an unrelated reason, and the report notes the incidental finding of multiple gallstones. The patient is completely asymptomatic and denies any history of abdominal pain, fever, or jaundice. His medical history is significant only for hypertension.
Which of the following is the most appropriate management for this patient's gallstones?
Explanation: The patient has asymptomatic cholelithiasis. The vast majority of individuals with asymptomatic gallstones will remain asymptomatic throughout their lives. Therefore, prophylactic cholecystectomy is not indicated due to the risks of surgery outweighing the small risk of developing symptoms or complications. Medical therapy with ursodeoxycholic acid is not necessary, and while a healthy diet is always advisable, specific dietary restrictions for asymptomatic gallstones are not required.
A 58-year-old man is diagnosed with acute cholecystitis based on clinical findings and an ultrasound showing a thickened gallbladder wall, pericholecystic fluid, and an impacted stone in the cystic duct. He is hemodynamically stable. He is started on intravenous fluids and antibiotics.
What is the most appropriate definitive treatment for this patient?
Explanation: The definitive treatment for acute cholecystitis is removal of the gallbladder (cholecystectomy). For stable patients, early laparoscopic cholecystectomy (ideally within 72 hours of presentation) is the standard of care. This approach is associated with shorter hospital stays and fewer complications compared to delayed surgery. ERCP is for common bile duct stones, not cystic duct obstruction. A cholecystostomy tube is reserved for patients who are too unstable or high-risk for surgery. A prolonged antibiotic course with delayed surgery is a less favored approach due to higher rates of complications and conversion to open surgery.
A 72-year-old man in the intensive care unit for severe pneumonia has been on mechanical ventilation and total parenteral nutrition (TPN) for 10 days. He develops a new fever to 39.0°C (102.2°F), a white blood cell count of 18,000/mm³, and right upper quadrant tenderness. An abdominal ultrasound shows a distended, thick-walled gallbladder without any gallstones.
What is the most likely diagnosis?
Explanation: Acute acalculous cholecystitis is an inflammatory condition of the gallbladder that occurs in the absence of gallstones. It is typically seen in critically ill patients with conditions like prolonged fasting, TPN, major surgery, trauma, or sepsis. Gallbladder stasis and ischemia are thought to be the underlying mechanisms. The presentation of new fever, leukocytosis, and RUQ pain in a critically ill patient, with ultrasound findings of gallbladder inflammation but no stones, is classic for this diagnosis.
An 80-year-old woman is brought to the emergency department from a nursing home with a 2-day history of fever, right upper quadrant pain, and confusion. Her temperature is 39.2°C (102.6°F), blood pressure is 90/50 mm Hg, and pulse is 120/min. On examination, she is jaundiced and has marked right upper quadrant tenderness. Laboratory results show a WBC count of 22,000/mm³, total bilirubin of 5.0 mg/dL, and elevated alkaline phosphatase.
Which of the following is the most likely diagnosis?
Explanation: This patient presents with Reynolds' pentad: fever, right upper quadrant pain, jaundice (Charcot's triad), plus hypotension and altered mental status. This clinical picture is pathognomonic for acute suppurative cholangitis, a life-threatening infection of the biliary tree due to obstruction. The obstruction (often from a gallstone) leads to biliary stasis and bacterial overgrowth, resulting in sepsis. This is a medical emergency requiring immediate fluid resuscitation, antibiotics, and biliary drainage.
A 75-year-old man presents with fever, jaundice, and right upper quadrant pain. His blood pressure is 85/45 mm Hg and he is lethargic. A diagnosis of acute cholangitis is made. He is started on intravenous fluids and broad-spectrum antibiotics.
Which of the following is the most appropriate immediate next step in management?
Explanation: The patient has severe acute cholangitis with signs of sepsis (hypotension, altered mental status). In addition to antibiotics and fluid resuscitation, the cornerstone of management is urgent biliary decompression to relieve the obstruction and drain the infected bile. Endoscopic retrograde cholangiopancreatography (ERCP) with sphincterotomy and stone extraction or stent placement is the preferred method for biliary drainage. Delaying drainage can lead to progressive sepsis and multiorgan failure. Cholecystectomy would address the gallbladder but not the bile duct obstruction. Imaging like MRCP or CT should not delay emergent drainage in a septic patient.
A 56-year-old woman presents with right upper quadrant pain and jaundice. Laboratory studies show total bilirubin 4.5 mg/dL, direct bilirubin 3.2 mg/dL, AST 250 U/L, ALT 300 U/L, and alkaline phosphatase 500 U/L. An ultrasound reveals gallstones and a common bile duct diameter of 10 mm. A stone is suspected but not definitively seen in the distal duct.
Which of the following is the best next step in both diagnosis and management?
Explanation: The patient has a high probability of choledocholithiasis given her symptoms, cholestatic liver enzyme pattern, and a dilated common bile duct on ultrasound. ERCP is the preferred procedure in this scenario because it serves both a diagnostic purpose (confirming the presence and location of the stone via cholangiography) and a therapeutic purpose (removing the stone via sphincterotomy and balloon/basket extraction). This single procedure can resolve the biliary obstruction. While MRCP is an excellent non-invasive diagnostic tool, it is not therapeutic. Laparoscopic cholecystectomy is necessary to treat the underlying cholelithiasis but should be preceded by clearing the common bile duct.
A 49-year-old man with a history of chronic pancreatitis presents with a 4-week history of worsening epigastric pain and new-onset jaundice. An abdominal CT scan confirms a 7-cm well-encapsulated fluid collection consistent with a pancreatic pseudocyst in the head of the pancreas. The common bile duct appears compressed and dilated.
Which of the following is the most appropriate next step in management?
Explanation: Asymptomatic pancreatic pseudocysts can often be managed with observation. However, this patient's pseudocyst is symptomatic (causing worsening pain) and causing a significant complication (biliary obstruction leading to jaundice). These are clear indications for intervention. Drainage is required to relieve the symptoms and the obstruction. This can be achieved endoscopically (cystogastrostomy or cystoduodenostomy) or surgically. Observation is inappropriate for a symptomatic and complicated pseudocyst. Needle aspiration provides only temporary relief, and antibiotics are not indicated without evidence of infection.
A 68-year-old woman presents with constant, severe epigastric pain radiating to her back. Her lipase is 4000 U/L. A right upper quadrant ultrasound reveals gallstones but no biliary ductal dilation. She is diagnosed with acute gallstone pancreatitis. After 3 days of supportive care, her abdominal pain resolves completely, her lipase level normalizes, and she is tolerating a diet. She is hemodynamically stable and afebrile.
What is the most appropriate management prior to discharging this patient?
Explanation: The patient had a mild case of gallstone pancreatitis, as indicated by her rapid clinical improvement. The standard of care to prevent recurrence is cholecystectomy. For mild gallstone pancreatitis, the cholecystectomy should be performed during the same hospital admission after the pancreatitis has resolved. Delaying the surgery significantly increases the risk of recurrent attacks of pancreatitis or other biliary complications within the intervening weeks. MRCP is not needed as there are no signs of persistent bile duct obstruction. Antibiotics are not indicated for mild, non-infected pancreatitis.
A 68-year-old man presents with a 3-week history of progressive, painless jaundice, dark urine, and pale stools. He has also lost 15 lbs unintentionally. Physical examination reveals scleral icterus and a non-tender, palpable gallbladder. An initial abdominal ultrasound shows intra- and extrahepatic biliary ductal dilation down to the level of the pancreas, but no stones are visualized.
Which of the following is the most appropriate next imaging study to evaluate the cause of the biliary obstruction?
Explanation: The patient's presentation of painless jaundice, weight loss, and a palpable, non-tender gallbladder (Courvoisier's sign) is highly concerning for a malignant obstruction of the distal common bile duct, most commonly from pancreatic adenocarcinoma. An abdominal CT scan with a pancreatic protocol (thin slices with IV contrast) is the best next imaging modality to visualize the pancreas, identify a potential mass, and assess for local invasion or metastatic disease, which is crucial for staging and determining resectability.
A 35-year-old man with a 10-year history of ulcerative colitis presents for an annual check-up. He denies abdominal pain but reports intermittent fatigue and pruritus. His laboratory tests are notable for an alkaline phosphatase of 600 U/L and a total bilirubin of 2.1 mg/dL. AST and ALT are mildly elevated.
Magnetic resonance cholangiopancreatography (MRCP) is ordered. This test is most likely to reveal which of the following findings?
Explanation: This patient's presentation of cholestatic liver enzymes (markedly elevated alkaline phosphatase) and pruritus in the setting of long-standing ulcerative colitis is highly suggestive of primary sclerosing cholangitis (PSC). PSC is a chronic inflammatory disease of the bile ducts strongly associated with inflammatory bowel disease. The characteristic finding on cholangiography (either MRCP or ERCP) is multifocal strictures and segmental dilations of the intrahepatic and extrahepatic bile ducts, creating a "beads on a string" appearance.
A 44-year-old woman is evaluated for a 2-week history of right upper quadrant pain. She reports that the pain is intermittent, severe, colicky, and often occurs after eating fatty meals. It lasts for about 30-60 minutes and then resolves completely. She denies fever, chills, or jaundice. Physical examination is unremarkable. A right upper quadrant ultrasound confirms the presence of multiple gallstones within a thin-walled gallbladder, without pericholecystic fluid or sonographic Murphy's sign.
What is the most appropriate management for this patient?
Explanation: This patient is experiencing biliary colic, which is symptomatic cholelithiasis. The recurrent, severe pain indicates that she is at high risk for complications such as acute cholecystitis, choledocholithiasis, or gallstone pancreatitis. The definitive treatment for symptomatic gallstone disease is elective laparoscopic cholecystectomy. Observation alone is inappropriate for symptomatic patients. Ursodeoxycholic acid has a limited role and high recurrence rate. ERCP is not indicated as there is no evidence of a common bile duct stone or obstruction.
A 45-year-old man with a history of alcohol use disorder presents to the emergency department with a 12-hour history of severe, constant epigastric pain that radiates to his back. He also reports nausea and has vomited twice. On examination, he is in moderate distress. His temperature is 37.8°C (100.0°F), blood pressure is 130/85 mm Hg, pulse is 110/min, and respirations are 22/min. Abdominal examination reveals epigastric tenderness to palpation without rebound or guarding. Bowel sounds are diminished. Laboratory studies are pending.
In addition to aggressive fluid resuscitation, which of the following is the most appropriate next step in establishing the diagnosis?
Explanation: The patient's presentation of severe epigastric pain radiating to the back, nausea, vomiting, and a history of alcohol use disorder is highly suggestive of acute pancreatitis. The diagnosis of acute pancreatitis requires two of the following three criteria: (1) characteristic abdominal pain, (2) serum lipase or amylase elevation >3 times the upper limit of normal, and (3) characteristic findings on cross-sectional imaging. Since the patient already has characteristic pain, the most direct and cost-effective next step is to measure serum lipase and amylase levels. Lipase is more specific and remains elevated longer than amylase.
A 50-year-old man with chronic pancreatitis and alcohol use disorder presents with steatorrhea and a 10-lb weight loss. He has been compliant with a low-fat diet. His pain is minimal. Fecal elastase testing is low, confirming exocrine insufficiency.
Which of the following is the most appropriate initial treatment for his steatorrhea?
Explanation: This patient has pancreatic exocrine insufficiency secondary to chronic pancreatitis, leading to malabsorption of fats and steatorrhea. The first-line and most effective treatment is pancreatic enzyme replacement therapy (PERT). These preparations contain lipase, protease, and amylase and should be taken with meals to aid in the digestion of nutrients, especially fat. This will reduce steatorrhea and improve weight. While a proton pump inhibitor can be added to reduce acid-mediated breakdown of the enzymes, PERT is the primary treatment. Octreotide is not indicated, and while MCT oil can be a caloric supplement, it does not address the underlying enzyme deficiency.
A 65-year-old woman presents to the emergency department with a 24-hour history of constant right upper quadrant pain, fever, and nausea. Her temperature is 38.6°C (101.5°F). Physical examination reveals marked tenderness in the right upper quadrant with inspiratory arrest on palpation (positive Murphy's sign). Laboratory studies show a white blood cell count of 15,000/mm³ with a left shift.
Which of the following is the most appropriate initial imaging study to confirm the suspected diagnosis?
Explanation: The clinical presentation of constant RUQ pain, fever, leukocytosis, and a positive Murphy's sign is highly suggestive of acute cholecystitis. The initial imaging test of choice is a right upper quadrant ultrasound. It is rapid, non-invasive, and can show gallstones, gallbladder wall thickening, pericholecystic fluid, and a sonographic Murphy's sign, which together confirm the diagnosis. A HIDA scan is the most specific test but is usually reserved for cases where the ultrasound is equivocal. CT and MRCP are not first-line for uncomplicated acute cholecystitis.
A 52-year-old woman is admitted to the hospital with acute pancreatitis. Her symptoms resolve after 48 hours of intravenous fluids and supportive care. Her serum lipase has decreased from 1500 U/L to 350 U/L. A right upper quadrant ultrasound reveals cholelithiasis and a non-dilated common bile duct. Her liver function tests have normalized. She is now tolerating a low-fat diet.
Which of the following is the most appropriate next step in the management of this patient?
Explanation: This patient has mild gallstone pancreatitis. To prevent recurrence, which is common and can be more severe, the definitive treatment is cholecystectomy. For mild gallstone pancreatitis, current guidelines recommend performing cholecystectomy during the same hospital admission once the patient has clinically improved. Delaying the surgery increases the risk of recurrent pancreatitis, cholecystitis, or choledocholithiasis.
A 55-year-old man with a 20-year history of heavy alcohol consumption presents with chronic, gnawing epigastric pain, frequent greasy stools, and an unintentional 20-lb weight loss over the past year. He was recently diagnosed with diabetes mellitus. An abdominal x-ray shows calcifications in the epigastric region.
Which of the following is considered the gold standard test for assessing pancreatic exocrine function in this patient?
Explanation: This patient's presentation is classic for chronic pancreatitis, with the triad of pancreatic calcifications, steatorrhea (exocrine insufficiency), and diabetes mellitus (endocrine insufficiency). The secretin stimulation test is the gold standard test for assessing pancreatic exocrine function, as it directly measures the pancreas's ability to produce bicarbonate in response to hormonal stimulation. While fecal elastase is a good non-invasive screening test commonly used in clinical practice, the secretin stimulation test remains the reference standard for definitive assessment of pancreatic function.
A 50-year-old woman is admitted with her first episode of acute gallstone pancreatitis. Her symptoms are improving with supportive care. However, her laboratory values show a total bilirubin that has risen from 2.5 mg/dL to 5.0 mg/dL over 24 hours, and an alkaline phosphatase of 450 U/L. An ultrasound shows a common bile duct diameter of 9 mm.
Which of the following is the most appropriate next intervention?
Explanation: This patient has gallstone pancreatitis with evidence of persistent common bile duct (CBD) obstruction, indicated by the rising bilirubin, elevated alkaline phosphatase, and dilated CBD on ultrasound. This suggests a concurrent diagnosis of choledocholithiasis or cholangitis. In this setting, ERCP is indicated for both diagnosis and therapy. It allows for visualization of the biliary tree and removal of the obstructing stone via sphincterotomy, which can alleviate the obstruction and prevent the development of ascending cholangitis. Cholecystectomy should be performed later, during the same admission, once the CBD is cleared.