Liver, gallbladder and biliary tree — MCQs

10 questions

A 65-year-old man comes to the clinic complaining of abdominal pain for the past 2 months. He describes the pain as a dull, aching, 6/10 pain that is diffuse but worse in the right upper quadrant (RUQ). His past medical history is significant for diabetes controlled with metformin and a cholecystectomy 10 years ago. He reports fatigue and a 10-lb weight loss over the past month that he attributes to poor appetite; he denies fever, nausea/vomiting, palpitations, chest pain, or bowel changes. Physical examination is significant for mild scleral icterus and tenderness at the RUQ. Further workup reveals a high-grade malignant vascular neoplasm of the liver. What relevant detail would you expect to find in this patient’s history?

During a surgical procedure to repair an abdominal aortic aneurysm, the surgeon must be careful to avoid injury to which of the following arterial structures that originates near the level of the renal vessels?

A 65-year-old obese female presents to the emergency room complaining of severe abdominal pain. She reports pain localized to the epigastrium that radiates to the right scapula. The pain occurred suddenly after a fast food meal with her grandchildren. Her temperature is 100.9°F (38.2°C), blood pressure is 140/85 mmHg, pulse is 108/min, and respirations are 20/min. On examination, she demonstrates tenderness to palpation in the epigastrium. She experiences inspiratory arrest during deep palpation of the right upper quadrant but this exam finding is not present on the left upper quadrant. A blockage at which of the following locations is most likely causing this patient’s symptoms?

A 48-year-old woman with a history of obesity presents with acute onset of diffuse epigastric pain that began a few hours ago and then localized to the right upper quadrant. Further questioning reveals that the pain has been exacerbated by eating but has otherwise been unchanged in nature. Physical exam reveals severe right upper quadrant pain that is accompanied by arrest of respiration with deep palpation of the right upper quadrant. Which of the following symptoms is associated with the most likely etiology of this patient's presentation?

A 41-year-old G3P3 woman presents with acute on chronic right upper quadrant abdominal pain. She says that her current symptoms acutely onset 8 hours ago after eating a large meal and have not improved. She describes the pain as severe, sharp and cramping in character, and localized to the right upper quadrant. She also describes feeling nauseous. The patient says she has had similar less severe episodes intermittently for the past 2 years, usually precipitated by the intake of fatty foods. She denies any history of fever or jaundice. Vital signs are stable. Physical examination is unremarkable, and laboratory findings show normal liver function tests and normal serum bilirubin and serum amylase levels. Ultrasonography of the abdomen reveals multiple stones in the gallbladder. The patient is managed symptomatically for this episode, and after a few months, undergoes elective cholecystectomy, which reveals multiple stones in her gallbladder as shown in the figure (see image). Which of the following best describes these gallstones?

A 26-year-old medical student who is preparing for Step 1 exams is woken up by her friend for breakfast. She realizes that she must have fallen asleep at her desk while attempting to study through the night. While walking with her friend to breakfast, she realizes that she has not eaten since breakfast the previous day. Using this as motivation to review some biochemistry, she pauses to consider what organs are responsible for allowing her to continue thinking clearly in this physiologic state. Which of the following sets of organs are associated with the major source of energy currently facilitating her cognition?

A 49-year-old woman is admitted to the hospital for the evaluation of postprandial colicky pain in the right upper quadrant of the abdomen. Abdominal ultrasound shows multiple round, hyperechoic structures within the gallbladder lumen. She undergoes a cholecystectomy. A photograph of the content of her gallbladder is shown. This patient is most likely to have which of the following additional conditions?

A 44-year-old woman presents to the emergency department with severe, fluctuating right upper quadrant abdominal pain. The pain was initially a 4/10 but has increased recently to a 6/10 prompting her to come in. The patient has a past medical history of type II diabetes mellitus, depression, anxiety, and irritable bowel syndrome. Her current medications include metformin, glyburide, escitalopram and psyllium husks. On exam you note an obese woman with pain upon palpation of the right upper quadrant. The patient's vital signs are a pulse of 95/min, blood pressure of 135/90 mmHg, respirations of 15/min and 98% saturation on room air. Initial labs are sent off and the results are below: Na+: 140 mEq/L K+: 4.0 mEq/L Cl-: 100 mEq/L HCO3-: 24 mEq/L AST: 100 U/L ALT: 110 U/L Amylase: 30 U/L Alkaline phosphatase: 125 U/L Bilirubin Total: 2.5 mg/dL Direct: 1.8 mg/dL The patient is sent for a right upper quadrant ultrasound demonstrating an absence of stones, no pericholecystic fluid, a normal gallbladder contour and no abnormalities noted in the common bile duct. MRCP with secretin infusion is performed demonstrating patent biliary and pancreatic ductal systems. Her lab values and clinical presentation remain unchanged 24 hours later. Which of the following is the best next step in management?

A 35-year-old female presents to her primary care physician complaining of right upper quadrant pain over the last 6 months. Pain is worst after eating and feels like intermittent squeezing. She also admits to lighter colored stools and a feeling of itchiness on her skin. Physical exam demonstrates a positive Murphy's sign. The vitamin level least likely to be affected by this condition is associated with which of the following deficiency syndromes?

Q10

A CT scan of the abdomen reveals a mass in the pancreatic uncinate process. Which of the following structures is most likely to be compressed by this mass?

Liver, gallbladder and biliary tree US Medical PG Practice Questions and MCQs

Question 1: A 65-year-old man comes to the clinic complaining of abdominal pain for the past 2 months. He describes the pain as a dull, aching, 6/10 pain that is diffuse but worse in the right upper quadrant (RUQ). His past medical history is significant for diabetes controlled with metformin and a cholecystectomy 10 years ago. He reports fatigue and a 10-lb weight loss over the past month that he attributes to poor appetite; he denies fever, nausea/vomiting, palpitations, chest pain, or bowel changes. Physical examination is significant for mild scleral icterus and tenderness at the RUQ. Further workup reveals a high-grade malignant vascular neoplasm of the liver. What relevant detail would you expect to find in this patient’s history?

A. Chronic alcohol abuse
B. Heavy ingestion of acetaminophen
C. Infection with the hepatitis B virus
D. Obesity
E. Prior occupation in a chemical plastics manufacturing facility (Correct Answer)

Explanation: ***Prior occupation in a chemical plastics manufacturing facility*** - This history suggests exposure to **vinyl chloride**, a known carcinogen associated with hepatic angiosarcoma, a rare but aggressive **vascular neoplasm of the liver**. - **Hepatic angiosarcoma** often presents with vague symptoms like abdominal pain, weight loss, and fatigue, as seen in this patient, and can lead to liver failure and jaundice [1]. *Chronic alcohol abuse* - While chronic alcohol abuse can lead to various liver diseases, including **alcoholic hepatitis**, **cirrhosis**, and **hepatocellular carcinoma (HCC)**, it is not typically associated with angiosarcomas. - The patient's symptoms are more consistent with a rapidly progressing malignancy, and HCC typically presents in patients with underlying cirrhosis or hepatitis. *Heavy ingestion of acetaminophen* - Acute or chronic overdose of **acetaminophen** primarily causes **centrilobular necrosis** and liver failure, but it is not linked to the development of hepatic vascular neoplasms like angiosarcoma. - The patient's presentation of a high-grade malignant vascular neoplasm points away from drug-induced liver injury as the primary cause. *Infection with the hepatitis B virus* - **Hepatitis B virus (HBV)** infection is a major risk factor for **hepatocellular carcinoma (HCC)**, a common primary liver cancer, but not for hepatic angiosarcoma. - The patient's clinical picture of a "high-grade malignant vascular neoplasm" is less typical for HCC, which originates from hepatocytes, not vascular endothelial cells. *Obesity* - Obesity is a risk factor for **non-alcoholic fatty liver disease (NAFLD)**, which can progress to **non-alcoholic steatohepatitis (NASH)**, cirrhosis, and **hepatocellular carcinoma (HCC)** [2]. - However, obesity is not directly linked to the development of primary hepatic vascular neoplasms like angiosarcoma.

Question 2: During a surgical procedure to repair an abdominal aortic aneurysm, the surgeon must be careful to avoid injury to which of the following arterial structures that originates near the level of the renal vessels?

A. Left renal artery (Correct Answer)
B. Celiac trunk
C. Right renal artery
D. Superior mesenteric artery

Explanation: ***Left renal artery*** - The **left renal artery** arises from the aorta usually just below the superior mesenteric artery, making it susceptible to injury during an **abdominal aortic aneurysm (AAA) repair** if the aneurysm extends proximally. - Its proximity to the typical location of AAA, often near or involving the **infrarenal aorta**, necessitates careful identification and protection during clamping or graft placement. *Celiac trunk* - The **celiac trunk** originates higher up from the aorta, typically at the level of **T12-L1 vertebrae**, well above the common infrarenal AAA repair site. - While important, it is generally less directly threatened during a typical infrarenal AAA repair compared to arteries immediately adjacent to or within the aneurysm sac. *Right renal artery* - The **right renal artery** also originates from the aorta near the level of the renal veins, but it is typically located more posteriorly and usually passes behind the inferior vena cava. - Although it can be at risk, the left renal artery's course is often more anterior and directly in the field of dissection for the **aortic neck** during AAA repair. *Superior mesenteric artery* - The **superior mesenteric artery (SMA)** originates from the aorta proximal to the renal arteries, typically around the L1 vertebral level. - While crucial, its origin is usually cephalad to the infrarenal aneurysm neck, making it generally less prone to direct injury during infrarenal AAA repair, though flow must be monitored.

Question 3: A 65-year-old obese female presents to the emergency room complaining of severe abdominal pain. She reports pain localized to the epigastrium that radiates to the right scapula. The pain occurred suddenly after a fast food meal with her grandchildren. Her temperature is 100.9°F (38.2°C), blood pressure is 140/85 mmHg, pulse is 108/min, and respirations are 20/min. On examination, she demonstrates tenderness to palpation in the epigastrium. She experiences inspiratory arrest during deep palpation of the right upper quadrant but this exam finding is not present on the left upper quadrant. A blockage at which of the following locations is most likely causing this patient’s symptoms?

A. Common hepatic duct
B. Ampulla of Vater
C. Cystic duct (Correct Answer)
D. Pancreatic duct of Wirsung
E. Common bile duct

Explanation: ***Cystic duct*** - This patient presents with **fever**, **right upper quadrant pain with inspiratory arrest (Murphy's sign)**, and a history of fatty meal ingestion, all classic signs of **acute cholecystitis** due to a gallstone obstructing the cystic duct. - Obstruction of the cystic duct leads to bile stasis, inflammation, and potential infection within the gallbladder, causing the characteristic symptoms. *Common hepatic duct* - Obstruction of the **common hepatic duct** would typically cause **jaundice**, as it would block bile flow from both the left and right hepatic ducts, leading to systemic bilirubin accumulation. - While it can cause right upper quadrant pain, the presence of Murphy's sign points more specifically to gallbladder inflammation. *Ampulla of Vater* - Obstruction at the **Ampulla of Vater** would lead to both **obstructive jaundice** and **pancreatitis** (due to blockage of both bile and pancreatic ducts), which are not fully reflected in this patient's presentation. - The patient's symptoms are more localized to the gallbladder rather than a diffuse obstruction of bile flow. *Pancreatic duct of Wirsung* - Obstruction of the **pancreatic duct of Wirsung** typically causes **acute pancreatitis**, characterized by severe epigastric pain often radiating to the back, elevated lipase and amylase, and potentially nausea/vomiting. - While the patient has epigastric pain, the radiation to the right scapula and positive Murphy's sign are more indicative of biliary pathology. *Common bile duct* - Obstruction of the **common bile duct** (choledocholithiasis) would cause **jaundice** due to the blockage of bile flow from the liver to the small intestine. - Although it can cause right upper quadrant pain and fever (if cholangitis develops), the prominent **Murphy's sign** makes acute cholecystitis from cystic duct obstruction a more direct diagnosis.

Question 4: A 48-year-old woman with a history of obesity presents with acute onset of diffuse epigastric pain that began a few hours ago and then localized to the right upper quadrant. Further questioning reveals that the pain has been exacerbated by eating but has otherwise been unchanged in nature. Physical exam reveals severe right upper quadrant pain that is accompanied by arrest of respiration with deep palpation of the right upper quadrant. Which of the following symptoms is associated with the most likely etiology of this patient's presentation?

A. Crunching sound upon heart auscultation
B. Pain with passive right leg raising
C. Diffuse substernal pain
D. Pain radiating to the right shoulder (Correct Answer)
E. Hematemesis

Explanation: ***Pain radiating to the right shoulder*** - The patient's presentation with acute epigastric pain localizing to the **right upper quadrant**, exacerbation by eating, and a positive **Murphy's sign** (arrest of respiration with deep palpation of the RUQ) is highly suggestive of **acute cholecystitis**. - **Referred pain** to the right shoulder or scapula is a classic symptom of cholecystitis due to irritation of the **diaphragm** and shared C3-C5 dermatomes with the phrenic nerve. *Crunching sound upon heart auscultation* - A crunching sound synchronous with the heartbeat (Hamman's sign) is indicative of **pneumomediastinum**, a condition unrelated to the patient's abdominal pain. - This symptom suggests air in the mediastinum, typically due to esophageal rupture or severe asthma, not gallbladder inflammation. *Pain with passive right leg raising* - Pain with passive right leg raising (**Psoas sign**) is associated with irritation of the **psoas muscle**, often seen in conditions like **appendicitis** or retroperitoneal abscess. - This finding is not characteristic of acute cholecystitis, which primarily affects the right upper quadrant. *Diffuse substernal pain* - Diffuse substernal pain is a hallmark symptom of **cardiac ischemia** or **gastroesophageal reflux disease (GERD)**. - While it can sometimes be confused with epigastric pain, the localization to the RUQ and positive Murphy's sign differentiate the patient's condition from these causes. *Hematemesis* - **Hematemesis**, or vomiting blood, suggests **upper gastrointestinal bleeding** from conditions like peptic ulcers, esophageal varices, or Mallory-Weiss tears. - This symptom is unrelated to acute cholecystitis, which involves inflammation of the gallbladder and not direct bleeding into the GI tract.

Question 5: A 41-year-old G3P3 woman presents with acute on chronic right upper quadrant abdominal pain. She says that her current symptoms acutely onset 8 hours ago after eating a large meal and have not improved. She describes the pain as severe, sharp and cramping in character, and localized to the right upper quadrant. She also describes feeling nauseous. The patient says she has had similar less severe episodes intermittently for the past 2 years, usually precipitated by the intake of fatty foods. She denies any history of fever or jaundice. Vital signs are stable. Physical examination is unremarkable, and laboratory findings show normal liver function tests and normal serum bilirubin and serum amylase levels. Ultrasonography of the abdomen reveals multiple stones in the gallbladder. The patient is managed symptomatically for this episode, and after a few months, undergoes elective cholecystectomy, which reveals multiple stones in her gallbladder as shown in the figure (see image). Which of the following best describes these gallstones?

A. These are usually radiopaque on X-ray imaging.
B. They are formed due to elevated uric acid in the blood.
C. These are seen in patients with chronic hemolysis.
D. They are formed due to the release of beta-glucuronidase from infecting bacteria.
E. They are formed due to bile supersaturated with cholesterol. (Correct Answer)

Explanation: ***They are formed due to bile supersaturated with cholesterol.*** - The patient's history of **postprandial right upper quadrant pain**, especially after fatty meals, and the ultrasound showing multiple gallstones, points to **cholesterol cholelithiasis**, which is caused by supersaturation of bile with cholesterol. - **Cholesterol stones** are the most common type of gallstones, accounting for about 80% of cases in Western countries, and their formation is linked to factors like obesity, rapid weight loss, and certain medications. *These are usually radiopaque on X-ray imaging.* - **Cholesterol stones** are primarily composed of cholesterol, which is not radiopaque, making them **radiolucent** in about 80% of cases on plain X-rays. - Their presence is typically detected by **ultrasonography**, which visualizes the stones regardless of their calcium content. *They are formed due to elevated uric acid in the blood.* - **Uric acid stones** are a type of **kidney stone**, primarily associated with conditions like gout and hyperuricemia, and are not involved in gallstone formation. - Gallstones are mineral deposits that form in the gallbladder, primarily from **cholesterol** or **bilirubin**, not uric acid. *These are seen in patients with chronic hemolysis.* - **Chronic hemolysis** leads to an increased production of **unconjugated bilirubin**, which can precipitate as **pigment gallstones** (specifically black pigment stones) due to excess bilirubin in the bile. - The patient's normal bilirubin levels rule out **hemolytic causes** for the gallstones in this case. *They are formed due to the release of beta-glucuronidase from infecting bacteria.* - The release of **beta-glucuronidase** from infecting bacteria (e.g., E. coli) in the biliary tract typically leads to the formation of **brown pigment stones**. - These stones are often found in the bile ducts and are associated with **biliary infections** or stasis, which is not suggested by the patient's presentation or normal lab findings.

Question 6: A 26-year-old medical student who is preparing for Step 1 exams is woken up by her friend for breakfast. She realizes that she must have fallen asleep at her desk while attempting to study through the night. While walking with her friend to breakfast, she realizes that she has not eaten since breakfast the previous day. Using this as motivation to review some biochemistry, she pauses to consider what organs are responsible for allowing her to continue thinking clearly in this physiologic state. Which of the following sets of organs are associated with the major source of energy currently facilitating her cognition?

A. Muscle only
B. Liver and kidney (Correct Answer)
C. Liver and muscle
D. Liver, muscle, and kidney
E. Liver only

Explanation: ***Liver and kidney*** - After an overnight fast (~16-24 hours without food), the **liver** is the **primary organ** responsible for maintaining blood glucose levels through **glycogenolysis** (initially) and **gluconeogenesis** (predominantly at this stage). - The **kidney** also contributes to **gluconeogenesis** even during an overnight fast, providing approximately **10-15% of total glucose production**. While this contribution is relatively minor compared to the liver, it becomes increasingly important during more prolonged fasting states (>48-72 hours), where it can account for up to 40% of glucose production. - Since the brain relies almost exclusively on glucose at this stage of fasting (ketone bodies are not yet a major fuel source), both organs that produce glucose for systemic use are correctly identified here. *Muscle only* - Muscle glycogen can only be used by the **muscle cells themselves** due to the absence of **glucose-6-phosphatase**, so muscle cannot release free glucose into the bloodstream for use by the brain. - While muscle does provide amino acids (particularly alanine and glutamine) for gluconeogenesis in the liver and kidney, it does not directly supply glucose to support brain function. *Liver and muscle* - As explained above, muscle cannot directly supply glucose to the bloodstream to support brain function due to the lack of **glucose-6-phosphatase**. - The liver is a major contributor, but muscle is not a direct source of blood glucose. *Liver, muscle, and kidney* - This option incorrectly includes muscle as a direct source of glucose for the brain. While liver and kidney both perform gluconeogenesis and release glucose into the bloodstream, muscle lacks this capability. *Liver only* - While the liver is indeed the **dominant source** of glucose during an overnight fast (contributing ~85-90% of gluconeogenesis), the **kidney also actively participates** in glucose production, contributing ~10-15% at this stage. - Since the question asks which organs are "responsible" for maintaining cognition, and both organs contribute to systemic glucose production (even if disproportionately), "liver only" is incomplete. - The kidney's contribution, though relatively minor during overnight fasting, becomes more substantial during prolonged fasting states.

Question 7: A 49-year-old woman is admitted to the hospital for the evaluation of postprandial colicky pain in the right upper quadrant of the abdomen. Abdominal ultrasound shows multiple round, hyperechoic structures within the gallbladder lumen. She undergoes a cholecystectomy. A photograph of the content of her gallbladder is shown. This patient is most likely to have which of the following additional conditions?

A. Morbid obesity
B. Primary hyperparathyroidism
C. Diabetes mellitus
D. Chronic hemolytic anemia (Correct Answer)
E. Menopausal symptoms

Explanation: ***Chronic hemolytic anemia*** - The image shows **pigment gallstones**, which are primarily composed of **bilirubin calcium salts**. - **Chronic hemolytic anemia** leads to increased bilirubin production and excretion, predisposing to the formation of pigment gallstones. *Morbid obesity* - **Obesity** is a risk factor for the formation of **cholesterol gallstones**, not pigment gallstones. - Accelerated cholesterol synthesis and secretion into bile, along with gallbladder hypomotility, contribute to cholesterol gallstone formation. *Primary hyperparathyroidism* - **Primary hyperparathyroidism** is associated with **calcium-containing kidney stones** and sometimes pancreatitis due to hypercalcemia, but not specifically pigment gallstones. - Gallstones formed in this context would more likely be cholesterol or mixed stones, not purely pigmentary. *Diabetes mellitus* - **Diabetes mellitus** is associated with an increased risk of **cholesterol gallstones** due to changes in bile composition and gallbladder motility. - It does not specifically increase the risk of pigment gallstone formation. *Menopausal symptoms* - **Female sex hormones**, particularly estrogen, increase the risk of **cholesterol gallstones** by altering bile composition and reducing gallbladder motility. - While menopause involves hormonal changes, it's typically pre-menopausal or multiparous status that is a stronger risk factor for cholesterol stones, not specifically menopausal symptoms leading to pigment stones.

Question 8: A 44-year-old woman presents to the emergency department with severe, fluctuating right upper quadrant abdominal pain. The pain was initially a 4/10 but has increased recently to a 6/10 prompting her to come in. The patient has a past medical history of type II diabetes mellitus, depression, anxiety, and irritable bowel syndrome. Her current medications include metformin, glyburide, escitalopram and psyllium husks. On exam you note an obese woman with pain upon palpation of the right upper quadrant. The patient's vital signs are a pulse of 95/min, blood pressure of 135/90 mmHg, respirations of 15/min and 98% saturation on room air. Initial labs are sent off and the results are below: Na+: 140 mEq/L K+: 4.0 mEq/L Cl-: 100 mEq/L HCO3-: 24 mEq/L AST: 100 U/L ALT: 110 U/L Amylase: 30 U/L Alkaline phosphatase: 125 U/L Bilirubin Total: 2.5 mg/dL Direct: 1.8 mg/dL The patient is sent for a right upper quadrant ultrasound demonstrating an absence of stones, no pericholecystic fluid, a normal gallbladder contour and no abnormalities noted in the common bile duct. MRCP with secretin infusion is performed demonstrating patent biliary and pancreatic ductal systems. Her lab values and clinical presentation remain unchanged 24 hours later. Which of the following is the best next step in management?

A. ERCP with manometry (Correct Answer)
B. Laparoscopy
C. Elective cholecystectomy
D. Analgesics and await resolution of symptoms
E. MRI of the abdomen

Explanation: ***ERCP with manometry*** - The patient's presentation with **biliary-type pain**, elevated liver enzymes (**AST, ALT, alkaline phosphatase**), and **conjugated hyperbilirubinemia** despite negative ultrasound and MRCP for gallstones or structural ductal abnormalities strongly suggests a **functional biliary disorder**, such as **sphincter of Oddi dysfunction (SOD)**. - **ERCP with manometry** is the gold standard for diagnosing SOD by directly measuring the pressure within the sphincter of Oddi; this procedure can also offer therapeutic intervention via sphincterotomy. *Laparoscopy* - While laparoscopy can be used to perform a cholecystectomy for **acalculous cholecystitis** or **biliary dyskinesia**, these conditions are less likely given the **normal gallbladder contour** and lack of pericholecystic fluid, and would not directly address the possibility of sphincter of Oddi dysfunction. - It is an invasive surgical procedure that would not provide diagnostic information about the patency or function of the biliary tree in the same way manometry does. *Elective cholecystectomy* - An **elective cholecystectomy** is not indicated as initial imaging (ultrasound, MRCP) has ruled out gallstones or significant structural gallbladder abnormalities, and the diagnosis of **biliary dyskinesia** has not been confirmed. - Performing a cholecystectomy without a clear indication could lead to persistent symptoms if the underlying issue is **sphincter of Oddi dysfunction**. *Analgesics and await resolution of symptoms* - This approach is inappropriate given the **persistent pain**, **elevated liver enzymes**, and **hyperbilirubinemia**, which suggest an ongoing pathological process that requires diagnosis and definitive treatment. - Simply masking the symptoms with analgesics would delay diagnosis and potentially lead to further complications. *MRI of the abdomen* - An **MRI of the abdomen** has already been performed in the form of an **MRCP** (Magnetic Resonance Cholangiopancreatography), which specifically visualizes the biliary and pancreatic ducts. - Since the MRCP with secretin infusion was negative for structural abnormalities, a repeat or general MRI of the abdomen would likely not yield additional diagnostic information regarding the cause of the biliary pain and elevated liver enzymes.

Question 9: A 35-year-old female presents to her primary care physician complaining of right upper quadrant pain over the last 6 months. Pain is worst after eating and feels like intermittent squeezing. She also admits to lighter colored stools and a feeling of itchiness on her skin. Physical exam demonstrates a positive Murphy's sign. The vitamin level least likely to be affected by this condition is associated with which of the following deficiency syndromes?

A. Rickets and osteomalacia
B. Hemolytic anemia
C. Night blindness
D. Increased prothrombin time and easy bleeding
E. Scurvy (Correct Answer)

Explanation: ***Scurvy*** - This condition is likely **cholestasis** due to common bile duct obstruction, given the RUQ pain after eating, light-colored stools, itchiness, and **positive Murphy's sign**. - Cholestasis impairs the absorption of **fat-soluble vitamins** (A, D, E, K), but not **water-soluble vitamins** like vitamin C, which prevents scurvy. *Rickets and osteomalacia* - These conditions are caused by **vitamin D deficiency**, which is a **fat-soluble vitamin**. - Impaired fat absorption in cholestasis would significantly impact vitamin D levels, leading to increased risk of rickets in children and osteomalacia in adults. *Hemolytic anemia* - This can be caused by **vitamin E deficiency**, a **fat-soluble vitamin**. - Cholestasis impairs vitamin E absorption, which can lead to increased red blood cell fragility and hemolytic anemia. *Night blindness* - This is a classic symptom of **vitamin A deficiency**, which is a **fat-soluble vitamin**. - Impaired fat absorption in cholestasis would reduce vitamin A uptake, contributing to night blindness. *Increased prothrombin time and easy bleeding* - These symptoms are indicative of **vitamin K deficiency**, a **fat-soluble vitamin**. - Vitamin K is essential for the synthesis of clotting factors, and its absorption is severely hindered in cholestasis, leading to coagulopathies.

Question 10: A CT scan of the abdomen reveals a mass in the pancreatic uncinate process. Which of the following structures is most likely to be compressed by this mass?

A. Common bile duct
B. Portal vein
C. Splenic vein
D. Superior mesenteric vein (Correct Answer)

Explanation: ***Superior mesenteric vein*** - The **uncinate process** of the pancreas hooks around the **superior mesenteric vessels**. Therefore, a mass in this region would most directly compress the **superior mesenteric vein (SMV)** and artery (SMA). - Compression of the SMV can lead to **venous outflow obstruction** from the small intestine, potentially causing **bowel ischemia** or edema. *Common bile duct* - The **common bile duct** passes through the **head of the pancreas**, not typically the uncinate process. - Compression of the common bile duct would more commonly be associated with masses in the **head of the pancreas**, leading to **jaundice**. *Portal vein* - The **portal vein** is formed by the union of the **splenic vein** and the **superior mesenteric vein**, generally posterior to the neck of the pancreas. - While pancreatic masses can affect the portal vein, a mass specifically in the uncinate process would more directly impinge on the SMV before significantly affecting the main portal vein, which is superior and posterior to the uncinate process. *Splenic vein* - The **splenic vein** runs along the **posterior aspect of the body and tail of the pancreas**. - A mass in the uncinate process, located at the inferior margin of the head, is relatively distant from the splenic vein.

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