Pancreatic Surgery Practice Questions

Q: In exocrine pancreatic cancer, what is the most common tumour marker that is elevated?

CA-19-9. **Explanation:** **CA 19-9 (Carbohydrate Antigen 19-9)** is the most common and clinically significant tumor marker for exocrine pancreatic adenocarcinoma. It is a sialylated Lewis (a) blood group antigen. While it is not used for screening (due to low sensitivity in early stages), it is the gold standard for **monitoring treatment response** and **detecting recurrence** after surgical resection. **Why the other options are incorrect:** * **CA-125:** This is the primary marker for **Ovarian Cancer**. While it can be elevated in various peritoneal irritations or other malignancies, it is not specific to the pancreas. * **CEA (Carcinoembryonic Antigen):** This is the classic marker for **Colorectal Cancer**. Although it can be elevated in pancreatic cancer, it is significantly less sensitive and specific than CA 19-9. * **CA-15-3:** This is a tumor marker primarily used for monitoring **Breast Cancer**. **High-Yield Clinical Pearls for NEET-PG:** 1. **Lewis Antigen Negative Status:** Approximately 5–10% of the population is "Lewis antigen-negative" (Le a-b-). These individuals lack the enzyme to synthesize CA 19-9; therefore, they will **not** show elevated levels even in advanced pancreatic cancer. 2. **Obstructive Jaundice:** CA 19-9 can be falsely elevated in patients with benign biliary obstruction or cholangitis. Levels should be re-evaluated after biliary decompression. 3. **Prognostic Value:** A very high pre-operative CA 19-9 level (>1000 U/mL) often suggests occult metastatic disease, even if imaging shows a localized tumor. 4. **Best Imaging:** While CA 19-9 is the best marker, **Triphasic Contrast-Enhanced CT (CECT)** is the gold standard imaging modality for diagnosis and staging.

Q: A 58-year-old male alcoholic with chronic pancreatitis develops a palpable abdominal mass. Ultrasound reveals a 9 cm cystic lesion adjacent to the pancreas. What is an important complication that might occur if this cyst ruptured?

Intestinal hemorrhage. **Explanation:** The clinical presentation of a chronic alcoholic with a large (9 cm) cystic lesion adjacent to the pancreas is classic for a **Pancreatic Pseudocyst**. **1. Why Intestinal Hemorrhage is Correct:** The most dreaded complication of a pancreatic pseudocyst is the erosion into an adjacent major vessel (most commonly the **splenic artery**, followed by the gastroduodenal artery). This leads to the formation of a **pseudoaneurysm**. If the pseudocyst ruptures or the pseudoaneurysm bleeds into the cyst (which then communicates with the GI tract via the pancreatic duct or direct erosion), it results in massive, life-threatening **intestinal hemorrhage** (hemosuccus pancreaticus). This is a surgical emergency with high mortality. **2. Analysis of Incorrect Options:** * **A. Anaphylactic shock:** This is characteristic of a ruptured **Hydatid cyst** (Echinococcus), not a pancreatic pseudocyst. * **B. Carcinomatosis:** This refers to the seeding of malignant cells. While some cystic neoplasms (like Mucinous Cystadenocarcinoma) have malignant potential, a pseudocyst is a benign inflammatory collection. * **C. Disseminated infection:** While a pseudocyst can become infected (forming a pancreatic abscess), rupture typically leads to pancreatic ascites or peritonitis rather than immediate systemic dissemination. **3. High-Yield Clinical Pearls for NEET-PG:** * **Definition:** A pseudocyst lacks an epithelial lining (lined by granulation tissue); hence "pseudo." * **Timing:** Usually develops **4–6 weeks** after an episode of acute pancreatitis. * **Management Rule:** Cysts **>6 cm** or persisting **>6 weeks** are less likely to resolve spontaneously and often require drainage (Endoscopic cystogastrostomy is the current gold standard). * **Most common site of pseudoaneurysm:** Splenic artery.

Q: What is the initial imaging modality of choice for insulinoma?

Endoscopic Ultrasound (EUS). **Explanation:** Insulinomas are the most common functional neuroendocrine tumors (NETs) of the pancreas. They are typically small ( 90%) for localizing insulinomas. Since the transducer is placed in close proximity to the pancreas via the stomach or duodenum, it overcomes the limitations of bowel gas and body habitus, allowing for the detection of very small lesions that other modalities might miss. It also allows for Fine Needle Aspiration (FNA) if required. **Analysis of Incorrect Options:** * **A. Ultrasound (USG):** Transabdominal USG has very low sensitivity (approx. 20-30%) for pancreatic tumors due to interference from overlying bowel gas and the small size of insulinomas. * **B. CT Abdomen:** While multiphasic (triple-phase) CT is often the first *non-invasive* step, it frequently misses small insulinomas. EUS remains superior for definitive localization. * **C. Somatostatin Receptor Scan (SRS):** Unlike other NETs (like gastrinomas), insulinomas often lack somatostatin receptors (SSTR2). Therefore, Octreotide scans have a low detection rate (~50%) and are not the preferred initial modality. **High-Yield Clinical Pearls for NEET-PG:** * **Whipple’s Triad:** Symptoms of hypoglycemia, low plasma glucose (<50 mg/dL), and relief of symptoms after glucose administration. * **Gold Standard for Localization:** Intraoperative Ultrasound (IOUS) combined with surgical palpation is the most accurate (nearly 100%), but EUS is the preferred *pre-operative* investigation. * **Medical Management:** Diazoxide is used to inhibit insulin release in patients awaiting surgery.

Q: Which of the following is NOT a component of the Ranson score?

None of the above. The **Ranson Criteria** is a clinical prediction rule used to predict the severity and mortality of acute pancreatitis. It assesses parameters at two time points: **at admission** and **at 48 hours**. ### **Why the Correct Answer is "None of the above"** The Ranson score is notorious in surgical exams for what it **excludes**. Despite being the gold standard biomarkers for diagnosing pancreatitis, **Serum Amylase and Serum Lipase are NOT components of the Ranson score.** Additionally, while Liver Function Tests (LFTs) are often checked, **ALT** is not a criteria (though AST is). Since none of the options (Amylase, Lipase, or ALT) are part of the scoring system, "None of the above" is the correct choice. ### **Analysis of Options** * **Amylase & Lipase (Options A & B):** These levels correlate with the diagnosis but **do not** correlate with the severity or prognosis of the disease. Therefore, they are excluded from Ranson, APACHE II, and Glasgow-Imrie scores. * **ALT (Option C):** The Ranson score includes **AST (SGOT) >250 U/L** at admission. ALT is not used in the scoring. ### **High-Yield Clinical Pearls for NEET-PG** To memorize the Ranson Criteria, use the mnemonics: **At Admission (GA LAW):** 1. **G**lucose >200 mg/dL 2. **A**ge >55 years 3. **L**DH >350 IU/L 4. **A**ST >250 U/L 5. **W**BC count >16,000/mm³ **At 48 Hours (C HOBBS):** 1. **C**alcium 10% 3. **O**xygen (PaO₂) 5 mg/dL 5. **B**ase deficit >4 mEq/L 6. **S**equestration of fluid >6 L **Note:** A score of **≥3** indicates severe pancreatitis; a score of **≥6** indicates a mortality rate of approximately 50%.

Q: All are true about neuroendocrine tumors of the pancreas except:

Diarrhea is the most common symptom of gastrinoma.. **Explanation:** The correct answer is **C** because it is a false statement. While diarrhea occurs in about 30–50% of patients with **Gastrinoma (Zollinger-Ellison Syndrome)**, the **most common clinical presentation is refractory peptic ulcer disease (PUD)**. Diarrhea in gastrinoma is caused by massive gastric acid secretion inactivating pancreatic enzymes and damaging the intestinal mucosa, but it is rarely the solitary or primary symptom. **Analysis of other options:** * **Option A:** **Insulinoma** is indeed the most common functional pancreatic neuroendocrine tumor (pNET). It typically presents with Whipple’s triad (hypoglycemic symptoms, low blood glucose, and relief upon glucose administration). * **Option B:** **VIPoma (Verner-Morrison Syndrome)** classically causes **WDHA syndrome**: Watery Diarrhea, Hypokalemia, and Achlorhydria (also known as "pancreatic cholera"). * **Option D:** **Somatostatinoma** inhibits the release of cholecystokinin (CCK) and impairs gallbladder contractility, leading to bile stasis and **gallstone formation**. It is also associated with the triad of diabetes, steatorrhea, and cholelithiasis. **High-Yield Clinical Pearls for NEET-PG:** * **Rule of 10s for Insulinoma:** 10% are malignant, 10% are multiple, and 10% are associated with MEN-1. * **Gastrinoma Triangle (Passaro’s Triangle):** Junction of cystic/common bile duct, junction of 2nd/3rd part of duodenum, and neck/body of pancreas. Most gastrinomas are found here. * **Glucagonoma:** Look for **Necrolytic Migratory Erythema (NME)**, weight loss, and diabetes. * **MEN-1 Association:** pNETs (especially Gastrinomas and Insulinomas) are frequently associated with Multiple Endocrine Neoplasia Type 1 (3Ps: Parathyroid, Pancreas, Pituitary).

Q: What is true about pseudocyst of pancreas?

It can present from the mediastinum to the pubis.. ### Explanation **1. Why Option D is Correct:** A pancreatic pseudocyst is a collection of pancreatic juice encapsulated by a wall of fibrous or granulation tissue. Because it lacks a fixed anatomical boundary and follows the path of least resistance along fascial planes, the fluid can dissect into various compartments. It most commonly occupies the lesser sac but can extend superiorly into the **mediastinum** (through the esophageal or aortic hiatus) or inferiorly into the **pararenal space, psoas muscle, and even the pelvis/pubis.** **2. Why Other Options are Incorrect:** * **Option A:** It is called a "pseudo" cyst because it **lacks an epithelial lining**. True cysts (like congenital or neoplastic cysts) are lined by epithelium. * **Option B:** Pseudocysts are most commonly a complication of **chronic pancreatitis** or **blunt abdominal trauma** (especially in children). Penetrating trauma usually results in fistulas or acute hemorrhage rather than contained pseudocysts. * **Option C:** Small, asymptomatic cysts often resolve spontaneously. Intervention (like cystogastrostomy) is generally indicated only if the cyst is **symptomatic** (pain, gastric outlet obstruction) or complicated (infection, hemorrhage). The traditional "6 cm/6 weeks" rule is now outdated; size alone is not an absolute indication for surgery. **Clinical Pearls for NEET-PG:** * **Timeframe:** Usually takes **4–6 weeks** to form a mature wall (required for internal drainage). * **Most common location:** Lesser sac (behind the stomach). * **Investigation of choice:** Contrast-Enhanced CT (CECT). * **Most common complication:** Infection (turning it into a pancreatic abscess). * **Biochemical marker:** High amylase levels in the cyst fluid.

Q: What is the most common type of pancreatic tumor?

Ductal adenocarcinoma. **Explanation:** **Ductal adenocarcinoma** is the correct answer because it accounts for approximately **85–90% of all pancreatic neoplasms**. It originates from the exocrine part of the pancreas, specifically the ductal epithelium. It most commonly occurs in the head of the pancreas (65–70%) and is notorious for its aggressive nature, early metastasis, and poor prognosis. **Analysis of Incorrect Options:** * **B. Cystadenoma:** These are cystic neoplasms (e.g., Serous or Mucinous). While they are important differential diagnoses for pancreatic masses, they are significantly rarer than solid ductal adenocarcinomas. * **C. Insulinoma:** This is the most common **functional** Neuroendocrine Tumor (NET) of the pancreas. However, overall, NETs represent only about 1–2% of all pancreatic tumors. * **D. Non-islet cell tumor:** This is a broad category that can include various mesenchymal tumors (like lymphomas or sarcomas), which are extremely rare primary findings in the pancreas compared to epithelial ductal tumors. **High-Yield Clinical Pearls for NEET-PG:** * **Risk Factors:** Smoking (strongest environmental factor), chronic pancreatitis, obesity, and long-standing Diabetes Mellitus. * **Clinical Triad:** Obstructive jaundice (if in the head), weight loss, and deep-seated abdominal/back pain. * **Courvoisier’s Law:** In a patient with painless obstructive jaundice, a palpable gallbladder is likely due to a malignancy (like pancreatic head CA) rather than gallstones. * **Tumor Marker:** **CA 19-9** (used for monitoring response to treatment, not for screening). * **Imaging:** Contrast-Enhanced CT (CECT) is the gold standard for diagnosis and staging (look for the "Double Duct Sign").

Question 1

When a patient is admitted with severe upper abdominal pain, the diagnosis of acute pancreatitis should not be accepted until which of the following conditions has been ruled out?

Accepted Answer

Adhesive small bowel obstruction

Answer

Acute cholecystitis

Answer

Acute renal colic

Answer

Mesenteric embolization

Question 2

Following admission to the hospital for intestinal obstruction, a 48-year-old woman states that she previously had undergone cholecystectomy and choledochoduodenostomy. What was the most likely indication for the performance of the choledochoduodenostomy?

Accepted Answer

Multiple stones were present in the common bile duct at the previous operation.

Answer

Hepatic metastases were present.

Answer

Multiple stones were present in the gallbladder at the previous operation.

Answer

The common hepatic duct had a stricture.

Question 3

In exocrine pancreatic cancer, what is the most common tumour marker that is elevated?

Accepted Answer

CA-19-9

Answer

CA-125

Answer

CEA

Answer

CA-15-3

Question 4

A 58-year-old male alcoholic with chronic pancreatitis develops a palpable abdominal mass. Ultrasound reveals a 9 cm cystic lesion adjacent to the pancreas. What is an important complication that might occur if this cyst ruptured?

Accepted Answer

Intestinal hemorrhage

Answer

Anaphylactic shock

Answer

Carcinomatosis

Answer

Disseminated infection

Question 5

What is the initial imaging modality of choice for insulinoma?

Accepted Answer

Endoscopic Ultrasound (EUS)

Answer

Ultrasound (USG)

Answer

CT abdomen

Answer

Somatostatin Receptor Scan (SRS)

Question 6

Vascular complications of acute pancreatitis include the following except?

Accepted Answer

Middle colic artery thrombosis

Answer

Splenic vein thrombosis

Answer

Splenic artery aneurysm

Answer

Gastroduodenal artery aneurysm

Question 7

Which of the following is NOT a component of the Ranson score?

Accepted Answer

None of the above

Answer

Amylase

Answer

Lipase

Answer

ALT

Question 8

All are true about neuroendocrine tumors of the pancreas except:

Accepted Answer

Diarrhea is the most common symptom of gastrinoma.

Answer

Insulinoma is the most common type.

Answer

Vasoactive intestinal peptide (VIP) causes diarrhea.

Answer

Somatostatinoma causes gallstone formation.

Question 9

What is true about pseudocyst of pancreas?

Accepted Answer

It can present from the mediastinum to the pubis.

Answer

It is a true cyst.

Answer

It is common with penetrating trauma to the abdomen.

Answer

It is treated with cystogastrostomy if the size is greater than 2 cm.

Question 10

What is the most common type of pancreatic tumor?

Accepted Answer

Ductal adenocarcinoma

Answer

Cystadenoma

Answer

Insulinoma

Answer

Non-islet cell tumor

Pancreatic Surgery — MCQs

Pancreatic Surgery — MCQs

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