Pancreatic Imaging — MCQs
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?
The duct of Wirsung is:
Which is the best investigation for carcinoma of the head of pancreas?
What condition does the MRCP (Magnetic Resonance Cholangiopancreatography) image indicate?
What is the imaging modality of choice for localizing neuroendocrine tumors?
Which of the following is not a recognized complication of chronic pancreatitis?
Monu, a 30-year-old male with a history of chronic alcoholism, presents with sudden onset of epigastric pain that radiates to the back. All are seen except:
Identify the condition shown in the plain abdominal radiograph.
Gas absent from intestine (gasless abdomen) on x-ray is seen in which condition?
According to endoscopic ultrasound (EUS) criteria for chronic pancreatitis, the main pancreatic duct is considered dilated when its diameter is:
Pancreatic Imaging Indian Medical PG Practice Questions and MCQs
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?
- A. Abetalipoproteinemia
- B. Cholelithiasis (Correct Answer)
- C. Cystic fibrosis
- D. Alcohol
Explanation: **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.
Question 2: The duct of Wirsung is:
- A. Parotid duct.
- B. Common bile duct
- C. Main Pancreatic duct (Correct Answer)
- D. Accessory Pancreatic duct
Explanation: ***Main Pancreatic duct*** - The **duct of Wirsung** is the primary duct that drains **pancreatic exocrine secretions** (digestive enzymes and bicarbonate) from the pancreas into the duodenum [1]. - It typically joins the **common bile duct** to form the **ampulla of Vater**, which then empties into the second part of the duodenum [3]. *Parotid duct* - The **parotid duct** (Stensen's duct) drains secretions from the **parotid salivary gland**. - It opens into the buccal mucosa opposite the second maxillary molar tooth, not related to the pancreas. *Common bile duct* - The **common bile duct** is formed by the union of the **common hepatic duct** and the **cystic duct**, carrying bile from the liver and gallbladder [2]. - While it often merges with the main pancreatic duct before entering the duodenum, it is not the duct of Wirsung itself. *Accessory Pancreatic duct* - The **accessory pancreatic duct** (duct of Santorini) is a smaller duct that drains a portion of the head of the pancreas directly into the duodenum. - It is present in many individuals but is distinct from the main pancreatic duct (Wirsung) and often has a separate opening proximal to the ampulla of Vater.
Question 3: Which is the best investigation for carcinoma of the head of pancreas?
- A. Transduodenal/transperitoneal sampling
- B. Guided biopsy
- C. ERCP
- D. EUS (Correct Answer)
Explanation: ***EUS*** - **Endoscopic ultrasound (EUS)** provides the highest resolution imaging of the pancreas and allows for **fine-needle aspiration (FNA)** of suspicious lesions, offering definitive tissue diagnosis. - Its ability to visualize small, early-stage tumors and regional lymph nodes makes it the **most accurate method for diagnosis and staging** of pancreatic head carcinoma. *Guided biopsy* - While a biopsy is necessary for definitive diagnosis, 'guided biopsy' is a broad term that doesn't specify the highly effective EUS guidance. - Other biopsy methods that are not guided by EUS may be less accurate and carry higher risks for pancreatic lesions. *ERCP* - **Endoscopic retrograde cholangiopancreatography (ERCP)** is primarily a therapeutic procedure used for **biliary drainage** in cases of obstruction caused by pancreatic head tumors. - Although it can visualize ductal abnormalities and allow brush cytology, it is **less sensitive for direct tumor visualization** and tissue acquisition compared to EUS-FNA. *Transduodenal/transperitoneal sampling* - These are **invasive surgical approaches** for obtaining tissue samples, typically reserved when less invasive methods like EUS-FNA are unsuccessful or when intraoperative confirmation is needed. - They carry **higher risks** and are not considered the "best investigation" for initial diagnosis due to their invasiveness and potential for complications.
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: What is the imaging modality of choice for localizing neuroendocrine tumors?
- A. USG
- B. CT
- C. MRI
- D. Somatostatin receptor scintigraphy (Correct Answer)
Explanation: ***Somatostatin receptor scintigraphy*** - **Somatostatin receptor scintigraphy** is the imaging modality of choice given that most neuroendocrine tumors (NETs) express a high density of somatostatin receptors. - **68Ga-DOTATATE PET/CT** is the **current preferred technique**, offering superior sensitivity (>90%) and specificity compared to older methods like Indium-111 pentetreotide (Octreoscan). - This functional imaging allows for **whole-body evaluation** and can detect both primary tumors and metastases, including small lesions that may be missed on conventional anatomical imaging. - Particularly valuable for detecting occult primary tumors and staging metastatic disease. *USG* - **Ultrasound** is useful for initial screening or evaluating superficial NETs, particularly in organs like the pancreas or liver. - However, its utility is limited by **operator dependence**, gas artifact, and its inability to detect small or deeply located tumors effectively. - Does not provide functional information about somatostatin receptor expression. *CT* - **Computed tomography** provides good anatomical detail and is useful for assessing tumor size, local invasion, and detecting liver metastases. - While helpful for anatomical characterization, CT can **miss small lesions** (especially <1 cm) and does not provide functional information about receptor status. - Often used in combination with functional imaging for treatment planning. *MRI* - **Magnetic resonance imaging** offers excellent soft tissue contrast and is particularly useful for NETs in the liver and pancreas. - Superior to CT for detecting liver metastases due to better soft tissue resolution. - However, MRI has **lower sensitivity for small or widespread lesions** compared to somatostatin receptor imaging and does not provide functional receptor information.
Question 6: Which of the following is not a recognized complication of chronic pancreatitis?
- A. Renal artery thrombosis (Correct Answer)
- B. Pancreatic pseudocyst
- C. Splenic vein thrombosis
- D. Pancreatic fistula
Explanation: ***Renal artery thrombosis*** - **Renal artery thrombosis** is generally associated with conditions like **atherosclerosis**, atrial fibrillation, or vasculitis, not directly with chronic pancreatitis. - While chronic pancreatitis can lead to systemic complications, direct renal arterial clotting is an atypical and **uncommon sequela**. *Pancreatic pseudocyst* - **Pancreatic pseudocysts** are common complications of chronic pancreatitis, occurring when fluid collections around the pancreas become walled off by fibrous tissue [1]. - They can cause pain, obstruction, and even rupture if left untreated [2]. *Splenic vein thrombosis* - **Splenic vein thrombosis** can result from inflammation and compression of the splenic vein by the diseased pancreatic tissue in chronic pancreatitis [1]. - This can lead to **splenomegaly** and **gastric varices** due to increased pressure in the portal system. *Pancreatic fistula* - A **pancreatic fistula** occurs when pancreatic fluid leaks from the gland, often forming a connection to another organ or the skin [2]. - This is a well-recognized complication of both acute and chronic pancreatitis, usually due to ductal disruption.
Question 7: Monu, a 30-year-old male with a history of chronic alcoholism, presents with sudden onset of epigastric pain that radiates to the back. All are seen except:
- A. Hypocalcaemia
- B. Increased serum amylase
- C. Low serum lipase (Correct Answer)
- D. Increased LDH
Explanation: ***Low serum lipase*** - In **acute pancreatitis**, serum lipase levels are typically **elevated**, not low, due to the inflammation and damage to pancreatic acinar cells. - A low serum lipase level would indicate a lack of pancreatic enzyme release, which contradicts the classic presentation of acute pancreatitis. *Increased LDH* - **Lactate dehydrogenase (LDH)** can be elevated in **severe acute pancreatitis**, indicating **tissue necrosis** and cell damage. - Elevated LDH is a marker of organ damage and can be used as an indicator of prognosis in acute pancreatitis, particularly in established scoring systems like Ranson's criteria. *Hypocalcaemia* - **Hypocalcaemia** can occur in acute pancreatitis due to the **saponification of peripancreatic fat** by free fatty acids, which binds calcium. - This is a serious complication, and severe hypocalcemia can lead to adverse outcomes like tetany and cardiac arrhythmias. *Increased serum amylase* - **Elevated serum amylase** is a hallmark finding in **acute pancreatitis**, typically rising within hours of onset. - Amylase levels are generally at least **three times the upper limit of normal** to be diagnostic of acute pancreatitis.
Question 8: Identify the condition shown in the plain abdominal radiograph.
- A. Pancreatic calcification (Correct Answer)
- B. Mesenteric calcification
- C. Horseshoe kidney
- D. Jejunal fecolith
Explanation: ***Pancreatic calcification*** - The radiograph displays **multiple, punctate, and amorphous calcifications** clustered in the upper abdomen, characteristic of **chronic pancreatitis**. - These calcifications represent **calcium deposits within the pancreatic ducts and parenchyma**, a hallmark sign of chronic inflammation and damage to the pancreas. *Mesenteric calcification* - **Mesenteric calcifications** are typically more scattered and linear, often following the distribution of blood vessels or lymph nodes within the mesentery, which is not seen here. - They are generally less dense and less granular than the calcifications observed in the image. *Horseshoe kidney* - A **horseshoe kidney** is a congenital anomaly where the kidneys are fused at their lower poles, forming a U-shape, and is typically located lower in the abdomen, often overlying the spine. - This condition presents with the characteristic **renal outlines** and not diffuse calcifications as shown. *Jejunal fecolith* - A **jejunal fecolith** would appear as a singular or a few discrete, dense, and typically rounded or oval radio-opacities within the lumen of the jejunum. - The diffuse, scattered pattern of calcifications displayed in the image is inconsistent with a fecolith, which is usually composed of inspissated fecal material.
Question 9: Gas absent from intestine (gasless abdomen) on x-ray is seen in which condition?
- A. Ulcerative colitis
- B. Intussusception
- C. Acute pancreatitis (Correct Answer)
- D. Necrotizing enterocolitis
Explanation: ***Acute pancreatitis*** - In **severe acute pancreatitis**, a **gasless or relatively gasless abdomen** may be seen due to profound **ileus** with fluid accumulation displacing intestinal gas. - The marked inflammatory process can lead to complete loss of intestinal motility and fluid sequestration (third-spacing), resulting in minimal visible bowel gas on X-ray. - **Note**: Classic signs include **sentinel loop sign** (dilated jejunal loop) or **colon cut-off sign**, but in severe cases with massive ascites or fluid collections, a gasless pattern may occur. *Ulcerative colitis* - Typically presents with **dilated loops of large bowel** with visible gas and **toxic megacolon** in severe cases. - Inflammatory changes cause bowel wall thickening, but gas is usually **present and often increased**. *Intussusception* - May show a **target sign** or **meniscus sign** on imaging, with bowel loops dilated proximal to the obstruction. - Gas is typically **present** within the bowel or proximal to the invagination, not absent from the entire abdomen. *Necrotizing enterocolitis* - Characterized by **pneumatosis intestinalis** (gas in the bowel wall) and **portal venous gas**, features directly contradicting a gasless abdomen. - Shows dilated loops with gas and evidence of bowel wall necrosis - **gas is prominently present**.
Question 10: According to endoscopic ultrasound (EUS) criteria for chronic pancreatitis, the main pancreatic duct is considered dilated when its diameter is:
- A. >1 mm
- B. >2 mm
- C. 1.5 mm
- D. >3 mm (Correct Answer)
Explanation: A main pancreatic duct diameter **greater than 3 mm** is a significant endoscopic ultrasound (EUS) criterion for the diagnosis of **chronic pancreatitis**. This dilation indicates advanced disease and is often accompanied by other EUS features like **lobularity**, **hyperechoic foci/stranding**, and cysts. While a dilated pancreatic duct is indicative of chronic pancreatitis, a diameter of **>1 mm** is generally too small to be considered a definitive EUS criterion for significant disease. A main pancreatic duct diameter greater than 2 mm is often considered abnormal [1], but it's **not the established threshold** used in EUS criteria for chronic pancreatitis. A diameter of 1.5 mm is usually considered within the **normal range** for the main pancreatic duct in many clinical contexts.
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