Choledocholithiasis — MCQs
The best investigative modality for gallbladder stones -
A 60-year-old patient with air in the biliary tree, colicky abdominal pain, and hyper-peristaltic abdominal sounds. What is the diagnosis?
Most common type of gallstone is?
What condition does the MRCP (Magnetic Resonance Cholangiopancreatography) image indicate?
Abdominal pain, fever and jaundice. This triad is known as;
A 45-year-old woman presents with right upper quadrant pain and fever. Ultrasound reveals gallstones with dilation of the bile ducts. What is the most appropriate next step?
What is the absolute indication for choledochotomy?
A 60-year-old diabetic man is admitted to the hospital with a diagnosis of acute cholecystitis. The white blood cell count is 28,000, and a plain film of the abdomen and computed tomography scan show evidence of intramural gas in the gallbladder. What is the most likely diagnosis?
What organism causes emphysematous cholecystitis?
Which of the following does not contribute to the formation of an enterobiliary fistula?
Choledocholithiasis Indian Medical PG Practice Questions and MCQs
Question 1: The best investigative modality for gallbladder stones -
- A. Oral cholecystogram
- B. Percutaneous transhepatic cholangiography
- C. Ultrasound (Correct Answer)
- D. Intravenous cholangiogram
Explanation: ***Ultrasound*** - **Ultrasound** is the **most widely accepted and accurate** non-invasive imaging modality for detecting gallstones. - It has a high sensitivity and specificity for visualizing stones within the gallbladder and assessing for associated complications like **cholecystitis**. *Oral cholecystogram* - This method involves ingestion of a contrast agent, which is then absorbed and excreted into the bile, outlining the gallbladder. - It has largely been replaced by ultrasound due to its **lower accuracy** and **dependence on gallbladder function**. *Percutaneous transhepatic cholangiography* - This is an **invasive procedure** involving direct puncture of a bile duct, typically reserved for visualizing the **biliary tree** when other methods are insufficient, especially in cases of obstructive jaundice. - It is **not the primary diagnostic tool** for uncomplicated gallstones but rather for complex biliary duct pathology. *Intravenous cholangiogram* - This involves intravenous injection of contrast, which is then excreted into the bile to visualize the biliary tree. - It is **rarely used today** due to its **limited diagnostic yield**, potential for adverse reactions, and the advent of superior imaging techniques like **MRCP** and **ERCP**.
Question 2: A 60-year-old patient with air in the biliary tree, colicky abdominal pain, and hyper-peristaltic abdominal sounds. What is the diagnosis?
- A. Hemobilia
- B. Cholangitis
- C. Pneumobilia
- D. Gallstone ileus (Correct Answer)
Explanation: ***Gallstone ileus*** - This condition presents with the classic triad of **pneumobilia** (air in the biliary tree), symptoms of **small bowel obstruction** (colicky abdominal pain, hyper-peristaltic sounds), and evidence of a **gallstone in the ileum**. - The gallstone typically erodes through the gallbladder wall into the small intestine, causing obstruction, often at the **ileocecal valve**. *Hemobilia* - Characterized by **bleeding into the biliary tree**, which presents with upper gastrointestinal bleeding, biliary colic, and jaundice. - It does not cause bowel obstruction or pneumobilia and is often associated with trauma, iatrogenic injury, or vascular malformations. *Cholangitis* - An **infection of the bile ducts**, typically presenting with **Charcot's triad**: fever, right upper quadrant pain, and jaundice. - While it involves the biliary tree, it does not typically cause air in the biliary tree or small bowel obstruction. *Pneumobilia* - Refers specifically to the presence of **air in the biliary tree** and is a sign, not a diagnosis for the entire clinical picture. - While present in this case, pneumobilia alone does not explain the colicky abdominal pain, hyper-peristaltic sounds, and bowel obstruction.
Question 3: Most common type of gallstone is?
- A. Pure cholesterol stones (Correct Answer)
- B. Pigment stones
- C. Calcium bilirubinate
- D. Mixed stones
Explanation: ***Mixed stones*** - Mixed gallstones, typically composed of **cholesterol** and **pigment**, are the most prevalent type, accounting for about 70-80% of cases [1]. - They are often associated with **biliary stasis** and **inflammation**, contributing to their formation. *Pigment stones* - Pigment stones are less common, usually representing about 10-20% of gallstones [1]. They are primarily formed from **bilirubin** and are associated with conditions causing **hemolysis**. - They may lead to **complications**, but their overall incidence is lower compared to mixed stones. *Calcium bilirubinate* - These stones are a type of **pigment stone**, formed in conditions like chronic hemolytic anemia, but they are relatively rare overall [1]. - They specifically result from **excess bilirubin**, unlike the mixed stones' composition which includes **cholesterol**. *Pure cholesterol stones* - Pure cholesterol stones occur in about 10-15% of cases, developing primarily due to **supersaturation of cholesterol** in bile. - They are less common than mixed stones and typically present as **large, yellowish stones** in the gallbladder.
Question 4: What condition does the MRCP (Magnetic Resonance Cholangiopancreatography) image indicate?
- A. Choledochal cyst (Correct Answer)
- B. Dilated CBD (Common Bile Duct)
- C. Acute cholecystitis
- D. Cholangiocarcinoma
Explanation: **Choledochal cyst** - The MRCP image clearly shows a **cystic dilation** of the common bile duct, which is characteristic of a choledochal cyst. - This congenital anomaly involves saccular or fusiform dilation of the bile ducts, as depicted by the **balloon-like structure** in the image. - MRCP is the **gold standard imaging modality** for diagnosing choledochal cysts, providing excellent visualization of the biliary tree anatomy. *Dilated CBD (Common Bile Duct)* - While a choledochal cyst is a type of CBD dilation, simply stating "dilated CBD" is not specific enough, as the image shows a distinct **cystic morphology** beyond just uniform dilation. - Common bile duct dilation can be caused by various factors like stones or strictures, but the **focal, bulbous appearance** points specifically to a cyst. *Acute cholecystitis* - Acute cholecystitis typically presents with signs of gallbladder inflammation, such as **gallbladder wall thickening**, pericholecystic fluid, and gallstones, which are not depicted in this MRCP. - MRCP primarily visualizes the bile ducts and does not typically show the inflammatory changes of the gallbladder wall as clearly as ultrasound or CT. *Cholangiocarcinoma* - Cholangiocarcinoma usually manifests as a **stricture** or **mass** within the bile ducts, causing upstream dilation, rather than the isolated cystic dilation seen in the image. - There is no evidence of an obstructing mass or irregular narrowing within the bile ducts that would suggest a malignancy.
Question 5: Abdominal pain, fever and jaundice. This triad is known as;
- A. Renault's triad
- B. Charcot's triad (Correct Answer)
- C. Virchow triad
- D. Saint's triad
Explanation: ***Charcot's triad*** - **Charcot's triad** consists of **abdominal pain**, **fever**, and **jaundice**, indicating **acute cholangitis** [1]. - This triad is a hallmark of **biliary tract obstruction** with concurrent infection [1]. *Renault's triad* - This is a **distractor** name; there is no recognized medical triad called "Renault's triad." - It does not describe any specific clinical presentation or set of symptoms. *Virchow triad* - **Virchow triad** describes factors that predispose to **thrombus formation**: **endothelial injury**, **stasis**, and **hypercoagulability**. - It is associated with conditions like **deep vein thrombosis (DVT)** and **pulmonary embolism**, not cholangitis. *Saint's triad* - **Saint's triad** refers to the co-occurrence of **gallstones**, **hiatal hernia**, and **diverticulosis**. - This triad describes three unrelated gastrointestinal conditions and is distinct from the symptoms of cholangitis.
Question 6: A 45-year-old woman presents with right upper quadrant pain and fever. Ultrasound reveals gallstones with dilation of the bile ducts. What is the most appropriate next step?
- A. Percutaneous cholecystostomy
- B. Endoscopic retrograde cholangiopancreatography (ERCP) (Correct Answer)
- C. Cholecystectomy
- D. Intravenous antibiotics
Explanation: ***Endoscopic retrograde cholangiopancreatography (ERCP)*** - This patient presents with symptoms and ultrasound findings suggestive of **acute cholangitis** (right upper quadrant pain, fever, dilated bile ducts, gallstones), which requires **urgent biliary decompression**. - **ERCP with sphincterotomy and stone extraction or stent placement** is the most appropriate next step to relieve the obstruction and treat the infection. *Percutaneous cholecystostomy* - This procedure involves placing a drain into the gallbladder percutaneously and is generally reserved for **critically ill patients** with acute cholecystitis who are not surgical candidates. - While it can drain the gallbladder, it does not address the **common bile duct obstruction** indicated by dilated bile ducts. *Cholecystectomy* - **Cholecystectomy** is the definitive treatment for gallstones and acute cholecystitis, but it is typically performed **after the acute infection and obstruction are resolved**. - Performing cholecystectomy during active cholangitis carries a **higher risk of complications**. *Intravenous antibiotics* - **Intravenous antibiotics** are a crucial component of treating acute cholangitis, but they are **not sufficient on their own** if a biliary obstruction is present. - Antibiotics should be administered, but **biliary decompression** is necessary to prevent worsening sepsis.
Question 7: What is the absolute indication for choledochotomy?
- A. Gallstone ileus
- B. Fever
- C. Gallstone pancreatitis
- D. Palpable CBD stone (Correct Answer)
Explanation: ***Palpable CBD stone*** - A **palpable stone in the common bile duct (CBD)** during surgery is an absolute indication for **choledochotomy** (surgical incision into the CBD) to remove the stone. - This direct finding necessitates immediate removal to prevent complications like **cholangitis**, **pancreatitis**, or **biliary obstruction**. *Gallstone ileus* - This condition involves a **gallstone eroding into the bowel** and causing mechanical obstruction, typically in the small intestine. - While it's a complication of gallstone disease, the primary treatment involves addressing the bowel obstruction, not necessarily choledochotomy for the CBD itself. *Fever* - Fever in the context of biliary disease usually indicates **cholangitis** or other infections. - While it prompts investigation for **biliary obstruction**, fever alone is not an absolute indication for choledochotomy without evidence of a CBD stone that requires removal. *Gallstone pancreatitis* - **Gallstone pancreatitis** occurs when gallstones obstruct the pancreatic duct or ampulla, leading to inflammation of the pancreas. - Most cases resolve spontaneously, and the primary management often involves supportive care and elective cholecystectomy, not immediate choledochotomy unless there's persistent obstruction or cholangitis.
Question 8: A 60-year-old diabetic man is admitted to the hospital with a diagnosis of acute cholecystitis. The white blood cell count is 28,000, and a plain film of the abdomen and computed tomography scan show evidence of intramural gas in the gallbladder. What is the most likely diagnosis?
- A. Emphysematous gallbladder (Correct Answer)
- B. Acalculous cholecystitis
- C. Cholangiohepatitis
- D. Sclerosing cholangitis
Explanation: ***Emphysematous gallbladder*** - The presence of **intramural gas** in the gallbladder wall, along with signs of **acute cholecystitis** and a high WBC count in a diabetic patient, is highly characteristic of emphysematous cholecystitis. - This severe form of cholecystitis is caused by gas-forming organisms, often seen in older, diabetic, or immunocompromised patients. *Acalculous cholecystitis* - This condition is **acute inflammation of the gallbladder** without the presence of gallstones, often seen in critically ill patients. - While it can be severe, it does not typically present with **intramural gas** as a primary diagnostic feature unless complicated by gas-forming organisms, which would then lead to emphysematous cholecystitis. *Cholangiohepatitis* - This refers to inflammation of the **bile ducts and liver parenchyma**, often presenting with fever, jaundice, and RUQ pain, but less commonly with gallbladder wall thickening or intramural gas. - Diagnosis usually requires evidence of **intrahepatic or extrahepatic bile duct dilation** or stones, which are not described here. *Sclerosing cholangitis* - This is a chronic, progressive cholestatic liver disease characterized by **inflammation and fibrosis of the bile ducts**, leading to strictures. - It presents with symptoms like **pruritus, fatigue, and jaundice**, and a diagnosis is typically made by cholangiography showing "beading" of the bile ducts; it does not involve intramural gallbladder gas.
Question 9: What organism causes emphysematous cholecystitis?
- A. Salmonella typhi
- B. Cytomegalovirus
- C. Clostridium perfringens (Correct Answer)
- D. Bacteroides
Explanation: **Explanation:** **Emphysematous cholecystitis** is a severe, life-threatening variant of acute cholecystitis characterized by the presence of gas within the gallbladder wall, lumen, or pericholecystic tissues. **Why Clostridium perfringens is correct:** The primary pathophysiology involves **ischemia** of the gallbladder wall (often due to cystic artery compromise), which creates an anaerobic environment. This allows gas-forming organisms to proliferate. **Clostridium perfringens** is the most common anaerobic organism isolated. It produces gas through the fermentation of glucose, leading to the characteristic radiographic finding of "gas shadows" on X-ray or CT. Other common isolates include *E. coli* and *Klebsiella*. **Why the other options are incorrect:** * **Salmonella typhi:** Associated with chronic carrier states in the gallbladder and "typhoid cholecystitis," but it is not a gas-forming organism and does not cause emphysematous changes. * **Cytomegalovirus (CMV):** Typically causes cholecystitis in immunocompromised patients (e.g., AIDS) as part of CMV polyradiculopathy or acalculous cholecystitis, but not emphysematous disease. * **Bacteroides:** While *Bacteroides fragilis* can be found in polymicrobial intra-abdominal infections, it is a less common primary driver of emphysematous cholecystitis compared to Clostridia. **High-Yield Clinical Pearls for NEET-PG:** * **Risk Factors:** Strongly associated with **Diabetes Mellitus** (found in >30-50% of cases) and the elderly. * **Gender:** Unlike typical cholecystitis, it is more common in **males** (M:F ratio 3:1). * **Acalculous:** It is frequently acalculous (stones are absent in up to 30% of cases). * **Complications:** High risk of **gangrene and perforation** (5x higher than routine cholecystitis). * **Management:** Emergency cholecystectomy is the treatment of choice.
Question 10: Which of the following does not contribute to the formation of an enterobiliary fistula?
- A. Duodenal ulcer
- B. Gall stones
- C. Gastric ulcer (Correct Answer)
- D. Carcinoma of the gallbladder
Explanation: **Explanation:** An enterobiliary fistula is an abnormal communication between the biliary tree and the gastrointestinal tract. The formation of such a fistula requires the offending organ to be in direct anatomical proximity to the gallbladder or common bile duct. **Why Gastric Ulcer is the Correct Answer:** The stomach (specifically the body and fundus) is not anatomically adherent to the gallbladder. While the pylorus and antrum are nearby, **gastric ulcers** typically occur on the lesser curvature and do not usually lead to biliary fistulization. In contrast, the duodenum and the transverse colon are the most common sites for these communications. **Analysis of Other Options:** * **Gallstones (Option B):** This is the **most common cause** (90% of cases). Chronic inflammation and pressure necrosis from a large stone lead to erosion through the gallbladder wall into an adjacent organ, most commonly the duodenum (cholecystoduodenal fistula). * **Duodenal Ulcer (Option A):** A posterior or superior wall duodenal ulcer can erode into the common bile duct or gallbladder, creating a fistula. This is the second most common cause after gallstones. * **Carcinoma of the Gallbladder (Option D):** Malignant infiltration can cause direct breakdown of the tissue planes between the gallbladder and the duodenum or colon, resulting in a malignant fistula. **NEET-PG High-Yield Pearls:** * **Most common type:** Cholecystoduodenal fistula (70%), followed by cholecystocolic. * **Rigler’s Triad (Pathognomonic for Gallstone Ileus):** 1. Pneumobilia (air in the biliary tree), 2. Small bowel obstruction, 3. Ectopic gallstone (usually in the ileum). * **Bouveret Syndrome:** A rare presentation where a large gallstone migrates through a fistula and causes gastric outlet obstruction.
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