Pancreatic Pathology Practice Questions

Q: What is true in a case of chronic pancreatitis?

Complete destruction of pancreatic tissue. **Explanation:** Chronic pancreatitis is characterized by **irreversible** morphologic changes. The core pathophysiology involves progressive inflammation leading to the **complete destruction of pancreatic parenchyma** (both exocrine and endocrine components), which is eventually replaced by dense fibrous connective tissue [1]. This leads to the classic triad of steatorrhea, diabetes mellitus, and pancreatic calcifications. **Analysis of Options:** * **Option B (Correct):** As the disease progresses, there is a total loss of acinar and islet cell mass, resulting in permanent functional insufficiency [1]. * **Option A (Incorrect):** Pancreatic pseudocysts are "pseudo" because they **lack an epithelial lining**. They are walled off by granulation and fibrous tissue, not gastric epithelium. * **Option C (Incorrect):** The most common cause of chronic pancreatitis worldwide is **chronic alcohol consumption** (70-80%) [1]. Biliary tract disease (gallstones) is a common cause of *acute* pancreatitis but rarely leads to chronic disease. * **Option D (Incorrect):** While gene mutations (e.g., **PRSS1, SPINK1, CFTR**) are associated with hereditary and idiopathic forms, they are not a universal finding in all cases of chronic pancreatitis. **High-Yield Clinical Pearls for NEET-PG:** * **Classic Triad:** Steatorrhea + Diabetes + Pancreatic Calcifications (seen on X-ray/CT) [1], [2]. * **Most sensitive test:** Secretin stimulation test (shows decreased bicarbonate output). * **Best initial imaging:** Contrast-Enhanced CT (CECT) to visualize calcifications and ductal dilation ("Chain of Lakes" appearance) [2]. * **Pain Management:** Steatorrhea is managed with pancreatic enzyme replacement therapy (PERT), which also helps reduce pain by suppressing CCK release.

Q: Which of the following is NOT true about mucinous cystadenoma of the pancreas?

Microcystic adenoma. **Explanation:** The correct answer is **A (Microcystic adenoma)** because this term refers to **Serous Cystadenoma**, which is a distinct clinical entity from Mucinous Cystadenoma. **1. Why Option A is correct (The False Statement):** Mucinous Cystadenomas are typically **macrocystic** (large cysts, usually 2 cm in size). In contrast, **Microcystic adenoma** is a synonym for Serous Cystadenoma, which is characterized by numerous tiny cysts (honeycomb appearance) and is almost always benign. **2. Analysis of Incorrect Options (True Statements):** * **Option B (Lined by columnar epithelium):** Mucinous cystadenomas are pathologically defined by a lining of tall, mucin-producing columnar epithelium. * **Option C (Premalignant):** Unlike serous lesions, mucinous cystadenomas have significant malignant potential and are considered precursors to invasive cystadenocarcinoma. Surgical resection is generally recommended for this reason. * **Option D (Presence of ovarian-like stroma):** This is a **pathognomonic feature** of mucinous cystic neoplasms. They occur almost exclusively in women (95%), and the dense, spindle-cell stroma resembles ovarian tissue. **Clinical Pearls for NEET-PG:** * **Demographics:** Mucinous cystadenomas are most common in the **body and tail** of the pancreas in middle-aged women ("Mother" tumor). * **Imaging:** Look for "peripheral eggshell calcification" on CT, which is highly suggestive of malignancy. * **Cyst Fluid Analysis:** High CEA levels (>192 ng/mL) and high viscosity (mucin) are characteristic, while amylase is typically low (unlike pseudocysts). * **Rule of Thumb:** Serous = Benign/Microcystic; Mucinous = Premalignant/Macrocystic.

Q: The MOST frequent genetic aberration associated with pancreatic malignancy is:

KRAS mutation. **Explanation:** Pancreatic Ductal Adenocarcinoma (PDAC) follows a well-defined progressive genetic model [1]. The **KRAS mutation** is the most frequent and earliest genetic alteration, present in more than **90-95%** of cases [1]. It involves a point mutation (most commonly at codon 12), which results in a constitutively active RAS protein. This leads to persistent activation of downstream signaling pathways (like MAPK and PI3K/AKT), promoting uncontrolled cellular proliferation and survival. **Analysis of Options:** * **KRAS (Option A):** The "initiating" event. It is found even in low-grade Pancreatic Intraepithelial Neoplasia (PanIN-1) lesions [1]. * **c-Src (Option B):** While Src family kinases are often overexpressed in various cancers and contribute to metastasis, they are not the primary or most frequent driver mutation in pancreatic cancer. * **SMAD4 (Option C):** This is a tumor suppressor gene (DPC4) inactivated in about 50-60% of pancreatic cancers. It is typically a late-stage event associated with tumor progression and metastasis, rather than the most frequent initiating mutation [1]. * **IGF-1R (Option D):** Insulin-like Growth Factor 1 Receptor is involved in cell growth signaling, but mutations are rare; it is more relevant as a potential therapeutic target rather than a diagnostic genetic hallmark. **High-Yield Clinical Pearls for NEET-PG:** * **Sequence of Mutations:** KRAS (earliest/most frequent) → CDKN2A (p16) → TP53 → SMAD4 (latest) [1]. * **Tumor Marker:** CA 19-9 is the most common marker used for monitoring (not screening). * **Risk Factors:** Smoking is the strongest environmental risk factor. * **Trousseau Sign:** Migratory thrombophlebitis associated with pancreatic visceral malignancy. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Pancreas, pp. 897-898.

Question 1

Intraductal papillary mucinous neoplasm is a precursor of which of the following entities?

Accepted Answer

Ductal adenocarcinoma

Answer

Mucinous cystic neoplasm

Answer

Mucinous non-cystic neoplasm

Answer

Solid pseudopapillary neoplasm

Question 2

What is true in a case of chronic pancreatitis?

Accepted Answer

Complete destruction of pancreatic tissue

Answer

Pseudocyst lined with gastric epithelium

Answer

Most common cause is biliary

Answer

Gene mutation is seen

Question 3

Which of the following is NOT true about mucinous cystadenoma of the pancreas?

Accepted Answer

Microcystic adenoma

Answer

Lined by columnar epithelium

Answer

Premalignant

Answer

Presence of ovarian-like stroma

Question 4

Which of the following conditions has the highest risk of progressing to pancreatic carcinoma?

Accepted Answer

Intraductal papillary mucinous neoplasms

Answer

Pseudopancreatic cyst

Answer

Serous cystic neoplasms

Answer

Mucinous cystic neoplasms

Question 5

Which of the following statements is false regarding hereditary pancreatitis?

Accepted Answer

Autosomal recessive inheritance

Answer

Mutation of the cationic trypsinogen gene

Answer

Hereditary pancreatitis is associated with chromosome 7

Answer

Increased risk of pancreatic cancer

Question 6

A 65-year-old woman presents with a 5-week history of yellow skin and sclera, anorexia, and epigastric pain. Her past medical history is significant for insulin-dependent diabetes mellitus. She smoked one pack of cigarettes a day for the past 20 years. Physical examination reveals jaundice and a palpable gallbladder. Laboratory studies show a serum bilirubin level of 10 mg/dL, mostly in the conjugated form, and an elevated alkaline phosphatase (260 U/L). A CT scan of the abdomen discloses a mass in the head of the pancreas and multiple nodules in the liver measuring up to 3 cm. Which of the following is the most likely cause of jaundice in this patient?

Accepted Answer

Extrahepatic biliary obstruction

Answer

Cholelithiasis

Answer

Cirrhosis

Answer

Hemolysis

Question 7

Activation of which of the following enzymes is responsible for acute pancreatitis?

Accepted Answer

Phospholipase A2

Answer

Colipase

Answer

Procarboxypeptidase

Answer

ProElastase

Question 8

What is the commonest type of pancreatic tumour?

Accepted Answer

Ductal adenocarcinoma

Answer

Cystadenoma

Answer

Insulinoma

Answer

Non-islet cell tumour

Question 9

The MOST frequent genetic aberration associated with pancreatic malignancy is:

Accepted Answer

KRAS mutation

Answer

c-Src

Answer

SMAD4

Answer

IGF-1R

Question 10

What is the most common anatomical site for adenocarcinoma of the pancreas?

Accepted Answer

Head

Answer

Body

Answer

Tail

Answer

Uncinate process

Pancreatic Pathology — MCQs

Pancreatic Pathology — MCQs

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