Congenital Anomalies of Pancreas — MCQs
Double bubble sign is seen in -
Tail of pancreas develops from -
True about pancreatic pseudocysts is:
The duct of Wirsung is:
Tumour of the uncinate process of the pancreas will compress which artery
Most common complication of a pseudocyst of the pancreas is
What is the echogenic lesion size criterion for chronic pancreatitis?
The treatment of an annular pancreas is
Congenital cyanotic heart disease with pulmonary oligemia is seen with –
In cystic fibrosis, which of the following structures is affected in the pancreas?
Congenital Anomalies of Pancreas Indian Medical PG Practice Questions and MCQs
Question 1: Double bubble sign is seen in -
- A. Duodenal atresia
- B. Annular pancreas
- C. Ladd's band
- D. All of the options (Correct Answer)
Explanation: ***All of the options*** - The **"double bubble sign"** on an X-ray indicates **duodenal obstruction**, which can be caused by intrinsic factors like **duodenal atresia** or extrinsic compressions such as an **annular pancreas** or **Ladd's bands** associated with malrotation. - While differing in etiology, all these conditions lead to fluid and air accumulation in the stomach and proximal duodenum, creating the characteristic two dilated loops. *Duodenal atresia* - This is an **intrinsic congenital obstruction** of the duodenum, preventing the passage of gastric and duodenal contents. - On imaging, it shows **two distinct air-filled bubbles** (one for the stomach, one for the proximal duodenum) separated by the pylorus. *Ladd's band* - **Ladd's bands** are peritoneal fibrous bands that can compress the duodenum in cases of **intestinal malrotation**, leading to extrinsic obstruction. - The resulting proximal duodenal dilation, along with gastric distension, presents as the **double bubble sign**. *Annular pancreas* - An **annular pancreas** is a congenital anomaly where pancreatic tissue completely encircles and obstructs the second part of the duodenum. - This extrinsic compression causes significant dilation of the stomach and proximal duodenum, mimicking the appearance of the **double bubble sign**.
Question 2: Tail of pancreas develops from -
- A. Hepatic diverticulum
- B. Ventral pancreatic bud
- C. Dorsal pancreatic bud (Correct Answer)
- D. All of the options
Explanation: Dorsal pancreatic bud - The dorsal pancreatic bud forms the majority of the pancreas, including the body, tail, and most of the head [1]. - It arises from the dorsal mesentery of the duodenum [1]. Hepatic diverticulum - The hepatic diverticulum gives rise to the liver, gallbladder, and bile ducts [2]. - It is separate from the pancreatic development and does not contribute to the pancreas. Ventral pancreatic bud - The ventral pancreatic bud forms only a small part of the pancreas, specifically the inferior portion of the head and the uncinate process [1]. - It rotates posteriorly with the duodenum to fuse with the dorsal bud [1]. All of the options - This option is incorrect because only the dorsal pancreatic bud forms the tail of the pancreas [1]. - The hepatic diverticulum does not contribute to pancreatic development at all, and the ventral pancreatic bud only forms the uncinate process and part of the head [1].
Question 3: True about pancreatic pseudocysts is:
- A. No epithelial lining (Correct Answer)
- B. Develops after 4 weeks
- C. Contains solid components
- D. Always needs surgery
Explanation: ***No epithelial lining*** - A pancreatic pseudocyst is defined by its lack of a true **epithelial lining**, distinguishing it from other cystic lesions of the pancreas. - Instead, its wall is formed by **fibrous and granulation tissue** surrounding a collection of pancreatic enzymes, inflammatory exudates, and necrotic debris. *Develops after 4 weeks* - While many pseudocysts do develop after an acute pancreatitis episode, the 4-week timeline is more specifically associated with the definition of a **pancreatic collection becoming a mature pseudocyst**. - However, pseudocysts can sometimes be observed earlier, and the defining characteristic is the absence of epithelium, not the time of formation. *Contains solid components* - Pancreatic pseudocysts are typically **fluid-filled collections** with a relatively uniform, anechoic appearance on imaging studies. - The presence of significant **solid components** would suggest a different lesion, such as a cystic tumor or a walled-off necrosis, rather than a simple pseudocyst. *Always needs surgery* - Many pancreatic pseudocysts, particularly smaller ones, can **resolve spontaneously** and thus do not always require surgical intervention. - Treatment often depends on size, symptoms, complications, and the duration of the pseudocyst, with conservative management or endoscopic drainage being viable options in many cases.
Question 4: 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 5: Tumour of the uncinate process of the pancreas will compress which artery
- A. Superior mesenteric artery (Correct Answer)
- B. Inferior mesenteric artery
- C. Common hepatic artery
- D. Splenic artery
Explanation: ***Superior mesenteric artery*** - The **uncinate process** forms the lower and medial part of the head of the pancreas, hooking around and behind the **superior mesenteric vessels**. - A tumor in this region would therefore almost immediately compress the **superior mesenteric artery** and vein due to its close anatomical relationship. *Splenic artery* - The **splenic artery** runs along the superior border of the pancreas, primarily associated with the body and tail. - A tumor in the **uncinate process** (part of the head) would be anatomically distant from the splenic artery, making compression unlikely. *Inferior mesenteric artery* - The **inferior mesenteric artery** arises from the aorta much lower than the pancreas, typically at the L3 vertebral level. - Its anatomical position makes it spatially separated from the uncinate process of the pancreas, so compression is not expected. *Common hepatic artery* - The **common hepatic artery** runs anterior to the portal vein and to the left of the bile duct, supplying the liver. - It is located superior to the head of the pancreas and away from the uncinate process, hence not typically affected by tumors in that specific pancreatic region.
Question 6: Most common complication of a pseudocyst of the pancreas is
- A. Rupture into peritoneum
- B. Haemorrhage
- C. Infection (Correct Answer)
- D. Rupture into colon
Explanation: ***Infection*** - **Infection** is the most common and clinically significant complication of a pancreatic pseudocyst, often leading to sepsis and increased mortality. - While other complications can occur, **secondary infection** transforms a sterile pseudocyst into an abscess, requiring urgent intervention. *Rupture into peritoneum* - While possible, **rupture into the peritoneum** (free rupture) is a less frequent complication compared to infection. - This leads to acute peritonitis and is a highly morbid event, but statistically less common than infection. *Haemorrhage* - **Hemorrhage** (bleeding) into a pseudocyst is a serious and potentially life-threatening complication, but it is less common than infection. - It usually results from erosion into adjacent blood vessels, such as the splenic or gastroduodenal arteries. *Rupture into colon* - **Rupture into the colon** or other adjacent organs (like the stomach or duodenum) can occur, but these are less frequent compared to infection. - Such ruptures can lead to internal fistula formation, but infection remains the predominant complication.
Question 7: What is the echogenic lesion size criterion for chronic pancreatitis?
- A. > 2 mm
- B. > 3 mm (Correct Answer)
- C. > 1 mm
- D. > 4 mm
Explanation: ***> 3 mm*** - An echogenic lesion **greater than 3 mm** in size is a diagnostic criterion for **chronic pancreatitis** when observed on ultrasound imaging. - This represents one of the **major features** in ultrasound diagnosis of chronic pancreatitis, particularly when echogenic foci demonstrate acoustic shadowing (suggesting calcifications). - This criterion is part of established diagnostic frameworks and helps differentiate pathological calcifications from minor, non-specific findings. *> 4 mm* - While a **4 mm threshold** would indicate significant findings, the established diagnostic criterion for chronic pancreatitis uses **> 3 mm** as the cutoff. - Using a higher threshold would reduce sensitivity for detecting chronic pancreatitis. *> 2 mm* - A lesion larger than **2 mm** is generally considered below the established diagnostic threshold for **chronic pancreatitis**. - This size may represent early changes or incidental findings that are not yet definitive for diagnosis. *> 1 mm* - A lesion **greater than 1 mm** is too small to be a definitive criterion for **chronic pancreatitis** and could represent minor, non-pathological findings. - Such small echogenic foci lack sufficient specificity for diagnosing chronic pancreatic disease.
Question 8: The treatment of an annular pancreas is
- A. Duodeno-duodenostomy
- B. Duodenojejunostomy (Correct Answer)
- C. Gastrojejunostomy
- D. Gastro-duodenostomy
Explanation: ***Duodenojejunostomy*** - An annular pancreas causes **duodenal obstruction**. A **duodenojejunostomy** bypasses this obstruction by connecting the duodenum to the jejunum, restoring intestinal flow. - This procedure aims to relieve the symptoms of obstruction without resecting the pancreatic tissue, which can be difficult due to its intimate relation with the duodenum. *Gastrojejunostomy* - This procedure connects the **stomach to the jejunum**, bypassing the duodenum. While it can relieve gastric outlet obstruction, it's not the primary or most appropriate treatment for duodenal obstruction specifically caused by an annular pancreas. - It might lead to **bile reflux into the stomach** and **marginal ulcers**, which are not ideal outcomes for this specific condition. *Duodeno-duodenostomy* - This procedure involves resecting a segment of the duodenum and reconnecting the remaining ends. It is not suitable for an annular pancreas because the **pancreatic tissue encircles the duodenum**, making simple resection and reconnection challenging and potentially risky to the pancreas. - The goal is to bypass the obstruction, not to directly resect the involved duodenal segment, which might be difficult given the **fibrous nature of the annular pancreas**. *Gastro-duodenostomy* - This procedure connects the **stomach to the duodenum** at a different point, often used after a **gastrectomy** (e.g., Billroth I). - It would not bypass the **duodenal obstruction caused by the annular pancreas** and thus would not resolve the patient's symptoms.
Question 9: Congenital cyanotic heart disease with pulmonary oligemia is seen with –
- A. VSD
- B. Hypoplastic left ventricle
- C. ASD
- D. Tricuspid atresia (Correct Answer)
Explanation: ***Tricuspid atresia*** - **Tricuspid atresia** is a **cyanotic congenital heart disease** where the tricuspid valve is absent, preventing blood flow from the right atrium to the right ventricle, leading to **pulmonary hypoperfusion** or **oligemia**. - Systemic venous return must shunt across an **atrial septal defect (ASD)** or **patent foramen ovale (PFO)** to the left atrium, mixing with oxygenated blood, resulting in cyanosis. - Chest X-ray characteristically shows **decreased pulmonary vascular markings** (oligemia). *VSD* - A **Ventricular Septal Defect (VSD)** typically causes a **left-to-right shunt**, leading to **pulmonary plethora (increased pulmonary blood flow)**, not oligemia. - While large VSDs can eventually lead to Eisenmenger syndrome with cyanosis, the initial presentation is usually characterized by increased pulmonary flow. *Hypoplastic left ventricle* - **Hypoplastic left heart syndrome (HLHS)** is a **cyanotic** condition, but it results in **pulmonary plethora (increased pulmonary blood flow)**, not oligemia. - All systemic venous return flows to the right ventricle, which pumps to both the pulmonary arteries (normal pathway) and to the systemic circulation via a **patent ductus arteriosus (PDA)**, resulting in normal or increased pulmonary blood flow. - The primary issue is a severely underdeveloped left side of the heart, which does not lead to pulmonary oligemia. *ASD* - An **Atrial Septal Defect (ASD)** usually causes a **left-to-right shunt**, leading to **pulmonary plethora (increased pulmonary blood flow)** and is typically an **acyanotic** heart condition. - Cyanosis only develops late if pulmonary hypertension leads to shunt reversal (Eisenmenger syndrome), which is not the primary presentation.
Question 10: In cystic fibrosis, which of the following structures is affected in the pancreas?
- A. Acinar cells
- B. Islets of Langerhans
- C. Pancreatic ducts (Correct Answer)
- D. Stromal tissue
Explanation: ***Pancreatic ducts*** - In cystic fibrosis, the **CFTR protein** dysfunction leads to thick, viscous secretions that obstruct the **pancreatic ducts** [2]. - This obstruction prevents digestive enzymes from reaching the intestine, causing **malabsorption** and progressive pancreatic damage [2]. *Acinar cells* - While pancreatic acinar cells are responsible for producing digestive enzymes, they are not directly dysfunctional in cystic fibrosis. - Their function is secondarily impaired due to the **blockage of the ducts** that carry their secretions [2]. *Islets of Langerhans* - The **islets of Langerhans** contain endocrine cells (e.g., insulin-producing beta cells) and are generally unaffected early in cystic fibrosis [1]. - Long-standing inflammation and fibrosis in severe cases can eventually impair islet function, leading to **CF-related diabetes** [1]. *Stromal tissue* - Stromal tissue (supporting connective tissue) is not the primary site of pathology in cystic fibrosis. - While chronic inflammation may lead to **fibrosis** of stromal tissue over time, the initial and primary defect is in the **ductal obstruction**, not in the stroma itself. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Pancreas, pp. 893-895. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Gastrointestinal Tract, p. 789.
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