Cystic Neoplasms of Pancreas — MCQs
A patient with jaundice is found to have a pancreatic head mass. What is the best diagnostic test?
Intraoperative radiation therapy (IORT) is most commonly used in which of the following cancers?
Most common complication of a pseudocyst of the pancreas is
Which of the following conditions is associated with perineural invasion?
What is the most important presenting feature of periampullary carcinoma?
A 45 year old female presented with a cystic lesion in the lesser sac on CT scan. Endoscopic ultrasound guided aspiration showed amylase to be 500 IU and carcinoembryonic antigen as 500ng/ml. What was she suffering from?
A young patient presents with a massive injury to proximal duodenum, head of pancreas and distal common bile duct requiring definitive surgical management. The procedure of choice in this patient should be
Treatment of choice for annular pancreas is
A 60-year-old chronic smoker presented with progressive jaundice, pruritus, and clay-colored stools for 2 months, with a history of waxing and waning of jaundice. A CT scan revealed dilated main pancreatic duct and common bile duct. What is the likely diagnosis?
During Pylorus preserving pancreatico-duodenectomy (PPPD) the following organs are removed except:
Cystic Neoplasms of Pancreas Indian Medical PG Practice Questions and MCQs
Question 1: A patient with jaundice is found to have a pancreatic head mass. What is the best diagnostic test?
- A. CT scan (Correct Answer)
- B. ERCP
- C. Ultrasound
- D. MRI
Explanation: ***CT scan*** - A **CT scan of the abdomen with contrast** is the initial investigation of choice for suspected pancreatic head mass due to its high diagnostic accuracy [1]. It provides detailed images of the pancreas, surrounding structures, and can help stage the disease [1]. - It effectively visualizes the **mass, evaluates for vascular invasion, and detects metastatic disease**, which are crucial for treatment planning [1]. *ERCP* - **Endoscopic retrograde cholangiopancreatography (ERCP)** is a therapeutic procedure primarily used for bile duct decompression, particularly in cases of obstructive jaundice [2]. - While it can visualize the bile ducts and pancreatic duct, it is **invasive** and not typically used as the primary diagnostic imaging modality for a pancreatic mass itself. *Ultrasound* - **Abdominal ultrasound** can detect a mass and dilated bile ducts, but it is operator-dependent and often has **limited sensitivity** for small pancreatic lesions, particularly in obese patients or those with bowel gas [1]. - It is often used as a first-line screening tool for jaundice but is usually followed by more definitive imaging like CT or MRI due to its **limited detail and penetration**. *MRI* - **Magnetic Resonance Imaging (MRI) with MRCP (Magnetic Resonance Cholangiopancreatography)** provides excellent soft tissue contrast, especially for assessing bile duct obstruction and assessing for vascular invasion [1]. - While highly sensitive, it is **more expensive and less readily available** than CT, making CT the preferred initial diagnostic test.
Question 2: Intraoperative radiation therapy (IORT) is most commonly used in which of the following cancers?
- A. Ca Thyroid
- B. Ca Pancreas (Correct Answer)
- C. Ca Cervix
- D. Ca Breast
Explanation: ***Ca Pancreas*** - **Intraoperative radiation therapy (IORT)** is frequently employed for **pancreatic cancer** due to its deep-seated location and locally advanced nature at presentation. - IORT allows for a **high dose of radiation** (10-20 Gy) to be delivered directly to the tumor bed and involved lymph nodes at the time of surgery, while critical structures like the stomach, duodenum, and kidneys can be retracted or shielded. - Particularly useful in **borderline resectable or locally advanced cases** where complete resection margins are difficult to achieve. - Used in specialized centers as part of multimodal therapy to improve local control. *Ca Thyroid* - **Thyroid cancer** is generally treated with surgery (thyroidectomy) followed by **radioactive iodine (RAI) therapy** for papillary and follicular types, not typically IORT. - The thyroid gland's superficial location and high avidity for iodine make RAI an effective targeted therapy. - IORT has no established role in standard thyroid cancer management. *Ca Cervix* - **Cervical cancer** treatment involves surgery, **external beam radiation therapy (EBRT)**, and **brachytherapy**, which places radioactive sources directly into or near the tumor. - Brachytherapy is superior for cervical cancer due to excellent dose distribution to the cervix and parametrium. - IORT is not a standard approach for primary cervical cancer, though it might be considered in select recurrent cases. *Ca Breast* - For **breast cancer**, IORT has gained significant traction, particularly for **early-stage disease** (T1-T2, node-negative) as an alternative to 5-6 weeks of external beam radiation. - **TARGIT-A and ELIOT trials** have established IORT as a viable option for partial breast irradiation during breast-conserving surgery. - While increasingly used globally with dedicated devices (INTRABEAM, ELIOT), it remains a **selective option** rather than universally applied. - The indication is more specific (favorable early-stage tumors) compared to the broader applications in pancreatic cancer where dose escalation and organ sparing are critical challenges.
Question 3: 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 4: Which of the following conditions is associated with perineural invasion?
- A. Mucoepidermoid tumor
- B. Pancreatic cancer
- C. Pleomorphic adenoma
- D. Adenoid cystic carcinoma (Correct Answer)
Explanation: ***Adenoid cystic carcinoma*** - **Adenoid cystic carcinoma** is the **most notoriously characterized** by its strong propensity for **perineural invasion**, which contributes to its high recurrence rate and poor prognosis [1]. - This invasion allows the tumor cells to spread along nerve sheaths, extending beyond the visible tumor margins, often for considerable distances. - It is the **classic example** of perineural invasion among salivary gland tumors [1]. *Mucoepidermoid tumor* - While mucoepidermoid tumors can be locally aggressive, **perineural invasion** is not a characteristic feature that defines this tumor type. - They are more commonly associated with cystic degeneration and mucin production. *Pancreatic cancer* - **Pancreatic adenocarcinoma** does show **significant perineural invasion** (present in 70-90% of cases) and is an important feature contributing to its poor prognosis and pain symptoms. - However, in the context of this question, **adenoid cystic carcinoma** is considered the **most characteristic** or **prototypical** example of perineural invasion, particularly among head and neck neoplasms. - Both are associated with perineural invasion, but adenoid cystic carcinoma is the textbook example. *Pleomorphic adenoma* - A **pleomorphic adenoma** is a benign mixed tumor of the salivary glands and usually does not exhibit **perineural invasion** [2]. - Malignant transformation into a carcinoma ex pleomorphic adenoma can occur, but the benign form primarily grows as an encapsulated mass [2]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Head and Neck, pp. 753-755. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Head and Neck, pp. 751-753.
Question 5: What is the most important presenting feature of periampullary carcinoma?
- A. Jaundice (Correct Answer)
- B. Abdominal Pain
- C. Unintentional Weight Loss
- D. Palpable Abdominal Mass
Explanation: ***Jaundice*** - **Painless obstructive jaundice** is the hallmark symptom, occurring early due to the tumor's proximity to the common bile duct. - The obstruction of bile flow leads to the accumulation of **bilirubin**, causing yellow discoloration of the skin and eyes. *Abdominal Pain* - While **abdominal pain** can occur, it is often a later symptom and is less specific than jaundice for early diagnosis. - Pain typically arises from tumor growth, invasion of surrounding structures, or pancreatic involvement. *Unintentional Weight Loss* - **Unintentional weight loss** is a common constitutional symptom of many advanced malignancies, including periampullary carcinoma. - However, it usually manifests at a later stage and is not the initial, specific presenting feature that prompts investigation. *Palpable Abdominal Mass* - A **palpable abdominal mass** is rare in early periampullary carcinoma, as these tumors are typically small and deeply seated. - Its presence usually indicates advanced disease with significant tumor burden or metastasis.
Question 6: A 45 year old female presented with a cystic lesion in the lesser sac on CT scan. Endoscopic ultrasound guided aspiration showed amylase to be 500 IU and carcinoembryonic antigen as 500ng/ml. What was she suffering from?
- A. Pancreatic adenocarcinoma
- B. Pseudocyst pancreas with ductal communication
- C. Chronic pseudocyst
- D. Mucinous neoplasm of pancreas (Correct Answer)
Explanation: ***Mucinous neoplasm of pancreas*** - **Markedly elevated CEA** (500 ng/ml, well above the threshold of 192 ng/ml) is highly specific for **mucinous cystic neoplasms** (MCN or IPMN). - The presence of **elevated amylase** (500 IU) indicates communication with the pancreatic ductal system, which can occur with **intraductal papillary mucinous neoplasms (IPMN)** or MCN with ductal involvement. - **CEA >192 ng/ml has >90% specificity** for distinguishing mucinous from non-mucinous lesions. - This patient likely has either an **MCN** (mucinous cystadenoma/cystadenocarcinoma) or **IPMN** with malignant potential requiring surgical evaluation. *Pseudocyst pancreas with ductal communication* - Pseudocysts typically have **high amylase** but **low CEA (<5 ng/ml)**. - A CEA of 500 ng/ml essentially **rules out a simple pseudocyst**. - Pseudocysts lack epithelial lining and do not produce CEA. *Chronic pseudocyst* - Similar to acute pseudocyst, chronic pseudocysts have **high amylase but low CEA**. - The markedly elevated CEA (500 ng/ml) makes this diagnosis incorrect. - Would expect CEA <5 ng/ml in pseudocyst fluid. *Pancreatic adenocarcinoma* - Solid pancreatic adenocarcinoma can have elevated CEA, but typically presents as a **solid mass**, not a cystic lesion. - Cyst fluid analysis would show **malignant cells on cytology** and typically **low amylase**. - Does not present as a pure cystic lesion in the lesser sac.
Question 7: A young patient presents with a massive injury to proximal duodenum, head of pancreas and distal common bile duct requiring definitive surgical management. The procedure of choice in this patient should be
- A. Pancreaticoduodenectomy (Whipple's operation) (Correct Answer)
- B. Lateral tube jejunostomy
- C. Roux-en-Y anastomosis
- D. Retrograde jejunostomy
Explanation: ***Pancreaticoduodenectomy (Whipple's operation)*** - This procedure involves the **surgical removal** of the head of the pancreas, the duodenum, a portion of the distal stomach, the gallbladder, and the distal common bile duct. - It is the **definitive procedure** for complex injuries involving these organs when damage control measures are not sufficient, as it effectively addresses damage to the **proximal duodenum, head of the pancreas, and distal common bile duct** simultaneously. - In cases of **irreparable combined injuries** to these structures, pancreaticoduodenectomy provides the most comprehensive reconstruction despite being a major operation. - While rarely performed in acute trauma settings due to high morbidity, it remains the **procedure of choice** when definitive management of all three injured structures is required. *Lateral tube jejunostomy* - This is a procedure primarily for **feeding access** or **decompression of the small bowel**, not for definitive management of massive injuries to the pancreas, duodenum, and bile duct. - It does not address the extensive tissue damage or the need for reconstruction of the digestive tract in such a complex injury. - May be used as an **adjunct** but cannot be the primary procedure. *Roux-en-Y anastomosis* - While a **Roux-en-Y reconstruction** is a component of a Whipple procedure, performing only an anastomosis of this type alone would be insufficient to manage the extensive injury described. - It is a method of connecting two structures, but it does not involve the necessary resections or the comprehensive reconstruction required for the damaged organs. - Does not address the **resection** of irreparably damaged tissue. *Retrograde jejunostomy* - **Retrograde jejunostomy** typically refers to a jejunostomy performed in a reverse direction for feeding or decompression purposes. - This procedure, like lateral tube jejunostomy, is used for feeding or decompression and is not a definitive surgical solution for massive organ injury. - It lacks the scope to address the comprehensive damage to the pancreatic head, duodenum, and bile duct.
Question 8: Treatment of choice for annular pancreas is
- A. Resection
- B. Pyloromyotomy
- C. Gastrojejunostomy
- D. Duodenoduodenostomy (Correct Answer)
Explanation: ***Duodenoduodenostomy*** - This procedure bypasses the **annular pancreatic constriction** by creating an anastomosis between two healthy segments of the **duodenum**, restoring normal flow. - It's preferred because it avoids manipulation or resection of the pancreatic tissue itself, which can lead to complications such as **pancreatitis** or **fistula formation**. *Resection* - Direct resection of the **annular pancreas** is generally avoided due to the high risk of **pancreatitis**, **fistulae**, and injury to the **biliary duct** or **main pancreatic duct**. - The abnormal pancreatic tissue is often intimately associated with the **duodenal wall**, making its complete removal difficult and dangerous. *Pyloromyotomy* - This procedure involves incising the muscle layer of the **pylorus** and is typically used for conditions like **pyloric stenosis**. - It does not address the obstruction caused by an annular pancreas around the **duodenum**. *Gastrojejunostomy* - This procedure involves creating a connection between the **stomach** and the **jejunum** to bypass a distal duodenal or pyloric obstruction. - While it can relieve gastric outlet obstruction, it does not directly address the obstruction in the **proximal duodenum** caused by an **annular pancreas**.
Question 9: A 60-year-old chronic smoker presented with progressive jaundice, pruritus, and clay-colored stools for 2 months, with a history of waxing and waning of jaundice. A CT scan revealed dilated main pancreatic duct and common bile duct. What is the likely diagnosis?
- A. Chronic pancreatitis
- B. Periampullary carcinoma (Correct Answer)
- C. Carcinoma head of pancreas
- D. Hilar cholangiocarcinoma
Explanation: ***Periampullary carcinoma*** - The key feature here is **waxing and waning jaundice**, which is a classic presentation of periampullary carcinoma due to the tumor's location at the ampulla of Vater. - **Mechanism**: The friable tumor tissue can undergo necrosis and sloughing, temporarily relieving the obstruction and causing fluctuating jaundice. - Both **dilated common bile duct and pancreatic duct (double duct sign)** are seen because the tumor involves the ampulla where both ducts converge. - **Chronic smoker** is a risk factor for pancreaticobiliary malignancies. - **Painless obstructive jaundice** with pruritus and clay-colored stools indicates extrahepatic biliary obstruction. *Carcinoma head of pancreas* - While this can also cause the **double duct sign** and obstructive jaundice, it typically presents with **steadily progressive jaundice** rather than waxing and waning. - Pancreatic head tumors cause persistent compression of the CBD, leading to continuous obstruction. - The fluctuating pattern is NOT characteristic of pancreatic head carcinoma. *Chronic pancreatitis* - Can cause dilated ducts and obstructive jaundice due to **fibrotic strictures**, but typically presents with **recurrent abdominal pain** and a history of repeated inflammatory episodes. - Pain is a predominant feature, which is absent in this case. - The clinical picture of painless progressive jaundice favors malignancy over inflammatory disease. *Hilar cholangiocarcinoma* - **Klatskin tumor** affects the confluence of hepatic ducts, causing **intrahepatic bile duct dilation** with normal or minimally dilated distal CBD. - **Pancreatic duct dilation would NOT occur** with hilar cholangiocarcinoma. - The presence of both dilated CBD and pancreatic duct rules this out.
Question 10: During Pylorus preserving pancreatico-duodenectomy (PPPD) the following organs are removed except:
- A. Distal Bile Duct
- B. Gall bladder
- C. Stomach (Correct Answer)
- D. Head of pancreas
Explanation: ***Stomach*** - In a **pylorus-preserving pancreaticoduodenectomy (PPPD)**, the **pylorus** and a portion of the **stomach** are deliberately preserved. - This distinguishes it from the classic Whipple procedure, where the **antrum** and pylorus of the stomach are removed. *Distal Bile Duct* - The **distal bile duct** is routinely resected in both standard and pylorus-preserving Whipple procedures to ensure adequate margins and remove potential **lymph node** metastases. - This is necessary because pancreatic head tumors often involve or compress the **distal common bile duct**. *Gall bladder* - The **gallbladder** is invariably removed during a PPPD to provide access to the **common bile duct** and facilitate the creation of a **choledochojejunostomy**. - Its removal prevents future complications like **cholecystitis** or **choledocholithiasis** secondary to altered bile flow. *Head of pancreas* - The **head of the pancreas** is the primary target for resection in a PPPD as this is typically the location of the **tumor**. - This involves removing the mass along with surrounding pancreatic tissue to achieve clear **surgical margins**.
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