Pancreatic Adenocarcinoma — MCQs
A 73-year-old woman has noticed a 10-kg weight loss in the past 3 months. She is becoming increasingly icteric and has constant vague epigastric pain, nausea, and episodes of bloating and diarrhea. On physical examination, she is afebrile. There is mild tenderness to palpation in the upper abdomen, but bowel sounds are present. Her stool is negative for occult blood. Laboratory findings include a total serum bilirubin concentration of 11.6 mg/dL and a direct bilirubin level of 10.5 mg/dL. Which of the following conditions involving the pancreas is most likely to be present?
Most frequently altered oncogene in pancreatic cancer is:
Which of the following is NOT typically associated with carcinoma of the pancreas?
The following procedure is performed for the management of?
CA 19-9 is a marker for which of the following:
Obesity predisposes to all, except ?
A 55-year-old woman presents with progressively deepening jaundice, uncontrollable pruritus, pain in the abdomen (right upper quadrant), and yellow-coloured urine. Investigations reveal that the patient has a mass in the head of the pancreas on imaging studies. What is the most likely diagnosis?
An 80-year-old man has increasing jaundice with abdominal pain for the past 2 weeks. He has lost 4 kg over the past 5 months. On physical examination, there is tenderness with palpable gallbladder in the right upper quadrant. An abdominal CT scan shows gallbladder and common bile duct dilation, along with a 3-cm mass in the head of the pancreas. Which of the following lesions is the most likely precursor to this mass?
Which of the following is resected in Whipple's operation, except?
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?
Pancreatic Adenocarcinoma Indian Medical PG Practice Questions and MCQs
Question 1: A 73-year-old woman has noticed a 10-kg weight loss in the past 3 months. She is becoming increasingly icteric and has constant vague epigastric pain, nausea, and episodes of bloating and diarrhea. On physical examination, she is afebrile. There is mild tenderness to palpation in the upper abdomen, but bowel sounds are present. Her stool is negative for occult blood. Laboratory findings include a total serum bilirubin concentration of 11.6 mg/dL and a direct bilirubin level of 10.5 mg/dL. Which of the following conditions involving the pancreas is most likely to be present?
- A. Cystic fibrosis
- B. Islet cell adenoma
- C. Chronic pancreatitis
- D. Adenocarcinoma (Correct Answer)
Explanation: ***Adenocarcinoma*** - The patient's age (73 years), significant **weight loss**, progressive **jaundice** (elevated direct bilirubin), **epigastric pain**, nausea, bloating, and diarrhea are all classic signs of **pancreatic adenocarcinoma**, particularly when it obstructs the bile duct [1]. - The high **direct bilirubin** indicates an **obstructive pattern of jaundice**, common with tumors in the **head of the pancreas** compressing the common bile duct [1]. *Cystic fibrosis* - While it affects the pancreas, symptoms typically manifest in **childhood or early adulthood** with recurrent pulmonary infections and malabsorption [2]. - It would not typically cause acute, obstructive jaundice in a 73-year-old with these specific symptoms. *Islet cell adenoma* - These tumors (e.g., insulinoma, gastrinoma) are functional and typically present with symptoms related to **hormone overproduction**, such as hypoglycemia or peptic ulcers. - They are less likely to cause obstructive jaundice or significant weight loss unless they grow very large. *Chronic pancreatitis* - This condition is characterized by recurrent episodes of **abdominal pain**, pancreatic insufficiency, and often calcifications on imaging [3]. - While it can lead to malabsorption and weight loss, the rapid onset of severe obstructive jaundice and significant weight loss in a 3-month period without a history of recurrent pancreatitis makes adenocarcinoma more likely [3].
Question 2: Most frequently altered oncogene in pancreatic cancer is:
- A. K-RAS (Correct Answer)
- B. CDKN2A
- C. SMAD4
- D. TP53
Explanation: ***K-RAS*** - **K-RAS** mutations are present in approximately **90%** of pancreatic adenocarcinomas, making it the most frequently altered oncogene in this cancer type [1]. - It plays a major role in the **Ras signaling pathway**, which is crucial for cell proliferation and survival. *TP53* - While **TP53** mutations are also common in various cancers, they are not the most prevalent in pancreatic cancer, where K-RAS is more frequently mutated [1]. - Typically associated with **tumor progression**, rather than initiating changes seen in pancreatic carcinogenesis [1]. *SMAD4* - **SMAD4** mutations occur in about **55%** of pancreatic cancers but are generally involved in the later stages of tumor progression, rather than being an initiating oncogenic event [1]. - Primarily functions in the **TGF-beta signaling pathway**, which is different from the K-RAS pathway. *CDKN2A* - Although **CDKN2A** deletions are implicated in pancreatic cancer, they are not as frequently altered as K-RAS mutations [1]. - This gene is related to the regulation of the **cell cycle**, but its alterations are secondary in the context of pancreatic oncogenesis [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Pancreas, pp. 897-898.
Question 3: Which of the following is NOT typically associated with carcinoma of the pancreas?
- A. Hypercalcemia
- B. Erythrocytosis
- C. Syndrome of inappropriate secretion of ADH
- D. Hypoglycemia (Correct Answer)
Explanation: ***Hypoglycemia*** - **Hypoglycemia** is generally not a direct paraneoplastic syndrome or common complication of typical pancreatic adenocarcinoma. - While **insulinomas** (a rare type of pancreatic neuroendocrine tumor) cause hypoglycemia, they are distinct from pancreatic adenocarcinoma [1]. *Syndrome of inappropriate secretion of ADH* - **SIADH** can be a paraneoplastic syndrome, causing **hyponatremia** due to excessive ADH secretion. - Although less common than in small cell lung cancer, some pancreatic cancers can produce **ectopic ADH**. *Erythrocytosis* - Some tumors, including certain pancreatic cancers, can produce **erythropoietin** leading to **erythrocytosis** (an increase in red blood cell mass). - This is a paraneoplastic syndrome reflecting excessive red blood cell production. *Hypercalcemia* - **Hypercalcemia of malignancy** is a well-recognized paraneoplastic syndrome that can occur with various cancers, including pancreatic cancer. - It can result from **parathyroid hormone-related peptide (PTHrP) production** by the tumor or extensive bony metastases.
Question 4: The following procedure is performed for the management of?
- A. Gallbladder carcinoma
- B. Distal cholangiocarcinoma (Correct Answer)
- C. Chronic calcific pancreatitis
- D. Advanced gastric carcinoma
Explanation: ***Distal cholangiocarcinoma*** - The image shows a **Pylorus-preserving Whipple procedure (PPPD)**, which involves resection of the pancreatic head, duodenum, gallbladder, and part of the common bile duct, followed by reconstruction. - This procedure is primarily performed for malignancies of the **pancreatic head**, **distal bile duct (cholangiocarcinoma)**, and **ampulla of Vater**, as they often cause obstructive jaundice and are resectable. *Gallbladder carcinoma* - While gallbladder carcinoma can involve the bile ducts, this specific reconstruction (PPPD) is more commonly associated with tumors of the pancreatic head or distal bile duct rather than the gallbladder itself, which might be managed with a **cholecystectomy** and possibly **liver resection**. - The type of resection and reconstruction varies significantly based on the extent and location of gallbladder cancer. *Chronic calcific pancreatitis* - Surgical management for chronic pancreatitis, especially with calcifications, typically involves drainage procedures (e.g., **Puestow procedure** due to dilated pancreatic duct or **Frey procedure**) or resection of the pancreatic head (e.g., **Beger procedure**). - While some resections of the pancreatic head are performed for chronic pancreatitis, the depicted procedure is specifically designed for malignancies of the pancreatic head region, not primarily for the sequelae of chronic calcific pancreatitis unless associated with a mass suspicious for malignancy. *Advanced gastric carcinoma* - Advanced gastric carcinoma is typically managed by **gastrectomy** (partial or total) with lymphadenectomy, not a Whipple procedure. - The image clearly shows an **intact pylorus** and the stomach mostly preserved, which is inconsistent with advanced gastric carcinoma requiring major gastric resection.
Question 5: CA 19-9 is a marker for which of the following:
- A. Breast carcinoma
- B. Lung carcinoma
- C. Ovarian carcinoma
- D. Pancreatic carcinoma (Correct Answer)
Explanation: ***Pancreatic carcinoma*** - **CA 19-9** is a widely used **tumor marker** primarily associated with **pancreatic cancer** [1]. - Its levels can be elevated in other conditions such as **cholangitis** or **gallstones**, but its most significant clinical utility is in monitoring pancreatic cancer progression and response to treatment [2], [4]. *Breast carcinoma* - The primary tumor markers for breast carcinoma are **CA 15-3** and **CA 27-29**, which are used for monitoring recurrence and treatment response. - While CA 19-9 can be slightly elevated in some breast cancer cases, it is not considered a primary or reliable marker for this type of cancer. *Lung carcinoma* - Common tumor markers for lung cancer include **CEA** (carcinoembryonic antigen) for non-small cell lung cancer and **NSE** (neuron-specific enolase) for small cell lung cancer [3]. - CA 19-9 has very limited utility in the diagnosis or monitoring of lung carcinoma. *Ovarian carcinoma* - **CA-125** is the primary tumor marker used for ovarian carcinoma, particularly for monitoring disease progression and treatment response. - Although CA 19-9 can be elevated in some gynecological malignancies, it is not the marker of choice for ovarian cancer.
Question 6: Obesity predisposes to all, except ?
- A. Diabetes
- B. Peptic ulcer disease (Correct Answer)
- C. Breast cancer
- D. Colon cancer
Explanation: ***Peptic ulcer disease*** - **Obesity** is generally **not considered a direct risk factor** for peptic ulcer disease; instead, factors like *H. pylori* infection and NSAID use are primary causes. - While comorbidities associated with obesity might indirectly influence gastric health, obesity itself doesn't directly predispose to ulcer formation. *Diabetes* - **Obesity**, particularly **abdominal obesity**, greatly increases the risk of **insulin resistance** and **Type 2 Diabetes Mellitus**. - Excess adipose tissue contributes to systemic inflammation and alters glucose metabolism. *Breast cancer* - **Obesity** is a significant risk factor for **postmenopausal breast cancer** due to increased estrogen production in adipose tissue. - It also promotes chronic inflammation, which can contribute to cancer development and progression. *Colon cancer* - **Obesity** is linked to an increased risk of **colorectal cancer** due to associated **insulin resistance**, chronic inflammation, and altered hormone levels. - These factors can stimulate cell proliferation and inhibit apoptosis in the colon.
Question 7: A 55-year-old woman presents with progressively deepening jaundice, uncontrollable pruritus, pain in the abdomen (right upper quadrant), and yellow-coloured urine. Investigations reveal that the patient has a mass in the head of the pancreas on imaging studies. What is the most likely diagnosis?
- A. Obstructive jaundice due to carcinoma of the pancreas (Correct Answer)
- B. Advanced liver cancer with jaundice
- C. Acute hepatitis with jaundice
- D. Chronic liver disease with jaundice
Explanation: ***Obstructive jaundice due to carcinoma of the pancreas*** - The constellation of **progressively deepening jaundice**, **uncontrollable pruritus**, and **yellow urine** (indicating conjugated hyperbilirubinemia) points to **obstructive jaundice** [1]. - The presence of a **mass in the head of the pancreas** on imaging directly explains the obstruction of the common bile duct, which is a classic presentation of **pancreatic head carcinoma**. *Acute hepatitis with jaundice* - **Acute hepatitis** typically presents with fatigue, nausea, and jaundice, but the jaundice is usually **not rapidly progressive** or accompanied by significant **pruritus** due to obstruction. Jaundice due to parenchymal liver disease is characteristically associated with significant increases in transaminases [2]. - Imaging would reveal **liver inflammation** rather than a pancreatic mass. *Advanced liver cancer with jaundice* - While **liver cancer** can cause jaundice, it's usually due to direct **liver cell damage** or widespread infiltration, leading to unconjugated or mixed hyperbilirubinemia [2]. - The most striking feature here is the **pancreatic mass** causing obstruction, not primarily liver parenchymal disease. *Chronic liver disease with jaundice* - **Chronic liver disease** (e.g., cirrhosis) can cause jaundice, but it's typically prolonged and associated with other signs of liver failure like **ascites**, **encephalopathy**, and **variceal bleeding**. - The prominent **obstructive symptoms** and the finding of a **pancreatic mass** are not characteristic of chronic liver disease as the primary cause of jaundice.
Question 8: An 80-year-old man has increasing jaundice with abdominal pain for the past 2 weeks. He has lost 4 kg over the past 5 months. On physical examination, there is tenderness with palpable gallbladder in the right upper quadrant. An abdominal CT scan shows gallbladder and common bile duct dilation, along with a 3-cm mass in the head of the pancreas. Which of the following lesions is the most likely precursor to this mass?
- A. Pancreatic intraepithelial neoplasia (Correct Answer)
- B. Duodenal adenocarcinoma
- C. Colonic neuroendocrine carcinoma
- D. Neuroendocrine tumor
Explanation: ***Pancreatic intraepithelial neoplasia (PanIN)*** - **PanIN is the most common precursor lesion** to pancreatic ductal adenocarcinoma (PDAC), which accounts for over 90% of pancreatic malignancies [1] - The clinical presentation with **jaundice, weight loss, abdominal pain, palpable gallbladder (Courvoisier's sign)**, and a **pancreatic head mass on CT** is classic for PDAC [1] - **PanIN lesions progress through grades** (PanIN-1, PanIN-2, PanIN-3) with accumulating genetic mutations (KRAS, p16, TP53, SMAD4) leading to invasive carcinoma [1] - Other precursor lesions include **intraductal papillary mucinous neoplasms (IPMN)** and **mucinous cystic neoplasms (MCN)**, but PanIN is the most frequent pathway [1] *Duodenal adenocarcinoma* - This is a **separate malignancy arising from duodenal mucosa**, not a precursor to pancreatic cancer - While periampullary duodenal cancers can cause similar obstructive jaundice, the CT clearly shows a **pancreatic parenchymal mass**, not a duodenal wall lesion - Duodenal adenocarcinoma would show **duodenal wall thickening** rather than a discrete pancreatic head mass *Colonic neuroendocrine carcinoma* - This is a **distinct malignancy from colonic origin**, not a precursor to pancreatic adenocarcinoma - Colonic neuroendocrine tumors typically present with **GI bleeding, bowel obstruction**, or distant metastases, not as a primary pancreatic mass - This option has no pathophysiologic relationship to pancreatic ductal adenocarcinoma *Neuroendocrine tumor* - **Pancreatic neuroendocrine tumors (PNETs)** are a different tumor lineage arising from islet cells, not ductal epithelium - PNETs are **not precursors to PDAC**; they are separate entities with distinct molecular profiles, behavior, and prognosis - While PNETs can present as pancreatic masses, they typically have **better prognosis** and different imaging characteristics (hypervascular vs hypovascular) **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Pancreas, pp. 897-900.
Question 9: Which of the following is resected in Whipple's operation, except?
- A. Duodenum
- B. Head of pancreas
- C. Neck of pancreas (Correct Answer)
- D. Common bile duct
Explanation: ***Neck of pancreas*** - In a **Whipple procedure** (pancreaticoduodenectomy), the **neck of the pancreas** is the site of transection (division), not resection. - The **head of the pancreas** (distal to the neck) is removed, while the **body and tail** (proximal to the neck) are preserved. - The transected surface at the neck is anastomosed to the jejunum to maintain pancreatic drainage. *Duodenum* - The **entire duodenum** is resected during a Whipple operation. - This is necessary because the **head of the pancreas** is intimately involved with the duodenum, sharing blood supply and lymphatic drainage. *Head of pancreas* - The **head of the pancreas** is the primary target for resection in a Whipple procedure. - This is typically performed for **malignancies** (pancreatic or periampullary tumors) or severe inflammatory conditions affecting this region. *Common bile duct* - The **distal common bile duct** is resected as part of the specimen to ensure complete tumor excision with adequate margins. - The remaining **proximal common bile duct** is then anastomosed to the jejunum (hepaticojejunostomy).
Question 10: 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.
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