Pancreatic Pathology Practice Questions

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.

Q: A 42-year-old female was diagnosed with a cystic neoplasm of the pancreas containing ovarian-type stroma. What is the most likely diagnosis?

Mucinous cystadenoma. The presence of **ovarian-type stroma** is the pathognomonic histological hallmark of **Mucinous Cystic Neoplasms (MCNs)** of the pancreas [1]. These tumors occur almost exclusively in females (95%), typically in the body or tail of the pancreas. The stroma consists of spindle cells that express estrogen and progesterone receptors, mimicking the appearance of the ovarian cortex. **Analysis of Options:** * **A. Mucinous Cystadenoma (Correct):** These are large, multiloculated cysts lined by columnar, mucin-secreting epithelium. The defining feature required for diagnosis is the underlying dense, "ovarian-like" mesenchymal stroma [1]. * **B. Serous Cystadenoma:** These are benign tumors characterized by a "honeycomb" appearance on imaging and a central stellate scar. Histologically, they are lined by cuboidal, glycogen-rich cells and lack ovarian stroma [1]. * **C. Solid Pseudopapillary Neoplasm (SPN):** While also common in young females, SPNs are characterized by discohesive cells forming pseudopapillae and are associated with beta-catenin mutations. They do not contain mucin or ovarian stroma. * **D. Intraductal Papillary Mucinous Neoplasm (IPMN):** These arise within the pancreatic ducts (usually the head). While they produce mucin, they lack the characteristic ovarian-type stroma and occur equally in men and women. **High-Yield Pearls for NEET-PG:** * **MCN Rule of "S":** **S**ex (Females), **S**ite (Tail/Body), **S**troma (Ovarian-type). * **Mnemonic:** "Mucinous is for Mothers" (Females, ovarian stroma). * **Malignant Potential:** Unlike serous cystadenomas, mucinous cystadenomas are considered premalignant and usually require surgical resection. * **Tumor Marker:** High CEA levels in the cyst fluid are suggestive of a mucinous etiology (MCN or IPMN). **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Pancreas, pp. 895-897.

Q: The term "pseudo" used in "pseudocyst" is due to its:

Lining. ### Explanation The term **"pseudocyst"** is used to distinguish this collection from a "true cyst" based on its histological structure [1]. **1. Why "Lining" is the correct answer:** In pathology, a **true cyst** is defined as an abnormal sac-like structure lined by **epithelium** (e.g., congenital cysts or serous cystadenomas). A **pancreatic pseudocyst**, which typically develops as a complication of acute or chronic pancreatitis, lacks an epithelial lining [1]. Instead, its wall is composed of **granulation tissue and fibrous tissue** [1]. Because it lacks the defining histological feature of a cyst (the epithelium), it is termed "pseudo" (false). **2. Why other options are incorrect:** * **Contents:** While pseudocysts contain pancreatic enzymes (amylase, lipase), inflammatory exudate, and necrotic debris, the nomenclature is based on the wall structure, not the fluid inside. * **Site:** Pseudocysts are commonly found in the lesser sac, but their location does not determine the "pseudo" prefix [1]. * **Course:** The clinical course (resolution vs. complication) is a result of the pathology, not the reason for its name. ### High-Yield Clinical Pearls for NEET-PG: * **Timing:** Pseudocysts typically form **4–6 weeks** after an episode of acute pancreatitis. * **Location:** Most common site is the **lesser sac**, posterior to the stomach [1]. * **Biochemical Marker:** Fluid analysis shows **high amylase levels** and low CEA (distinguishing it from mucinous cystic neoplasms). * **Management:** Most resolve spontaneously; intervention (e.g., cystogastrostomy) is indicated only if they become symptomatic, infected, or exceed 6 cm and persist beyond 6 weeks [1]. * **Most Common Cause:** Chronic alcoholic pancreatitis in adults; trauma in children. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Pancreas, p. 895.

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

Microcystic adenoma. **Explanation:** The question asks for the statement that is **NOT** true regarding **Mucinous Cystadenoma (MCN)** of the pancreas. **1. Why Option A is the Correct Answer:** **Microcystic adenoma** is a synonym for **Serous Cystadenoma**, not Mucinous Cystadenoma [1]. Serous cystadenomas are characterized by numerous small, fluid-filled cysts (honeycomb appearance) and are almost always benign [2]. In contrast, Mucinous Cystadenomas are typically **macrocystic** (containing fewer, larger cysts). **2. Analysis of Incorrect Options (True statements about MCN):** * **Option B (Lined by columnar epithelium):** MCNs are histologically characterized by cysts lined by tall, mucin-producing columnar epithelium. * **Option C (Premalignant):** Unlike serous cystadenomas, MCNs are considered premalignant precursors to invasive mucinous cystadenocarcinoma [1]. Surgical resection is usually indicated. * **Option D (Focus of ovarian stroma):** This is a **pathognomonic feature** of MCN [2]. The cysts are surrounded by a dense, cellular stroma resembling ovarian tissue. This explains why MCNs occur almost exclusively in women (95% of cases) [2]. **High-Yield Clinical Pearls for NEET-PG:** * **Location:** MCNs are most commonly found in the **body or tail** of the pancreas (unlike IPMNs, which are often in the head). * **Demographics:** Classically seen in middle-aged women ("Mother" tumor). * **Imaging:** Look for a thick-walled, multiloculated cyst; peripheral "eggshell" calcification is highly suggestive of MCN. * **Tumor Markers:** Cyst fluid analysis typically shows **high CEA** levels (unlike serous cystadenoma, which has low CEA). **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Pancreas, p. 897. [2] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Pancreas, pp. 895-897.

Q: What is the most common gene associated with pancreatic cancer?

KRAS. **Explanation:** Pancreatic ductal adenocarcinoma (PDAC) follows a well-defined genetic progression model involving the activation of oncogenes and the inactivation of tumor suppressor genes [1]. **Why KRAS is correct:** The **KRAS** gene (located on chromosome 12p) is the most frequently mutated gene in pancreatic cancer, found in **>90-95% of cases**. It is an oncogene that encodes a GTP-binding protein involved in cell signaling. KRAS mutations occur very early in the neoplastic progression (seen even in low-grade PanIN-1 lesions), making it the "initiating" genetic event in the majority of pancreatic malignancies [1]. **Analysis of Incorrect Options:** * **P53 (TP53):** This is the most common tumor suppressor gene mutated in pancreatic cancer (found in ~75% of cases), but it occurs later in the progression (PanIN-3) compared to KRAS [1]. * **SMAD4 (DPC4):** Mutated/deleted in about 55% of cases [1]. It is relatively specific to pancreatic cancer (DPC stands for "Deleted in Pancreatic Carcinoma"), but it is less common than KRAS. * **Rb:** While the p16/CDKN2A pathway (which regulates the Rb checkpoint) is inactivated in 95% of cases, direct mutations of the **Rb gene** itself are not the primary driver in pancreatic cancer compared to its role in retinoblastoma or osteosarcoma [1]. **High-Yield Clinical Pearls for NEET-PG:** 1. **Sequence of Mutations:** KRAS (Early) → CDKN2A/p16 (Intermediate) → TP53 & SMAD4 (Late) [1]. 2. **Tumor Marker:** **CA 19-9** is used for monitoring response to treatment, not for primary screening. 3. **Risk Factors:** Smoking (strongest environmental factor), chronic pancreatitis, and diabetes mellitus. 4. **Location:** 60% occur in the **head of the pancreas**, often presenting with painless obstructive jaundice (Courvoisier’s Law) [1]. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Pancreas, pp. 897-900.

Question 1

The MOST frequent genetic aberration associated with pancreatic malignancy is:

Accepted Answer

KRAS mutation

Answer

c-Src

Answer

SMAD4

Answer

IGF-1R

Question 2

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

Accepted Answer

Head

Answer

Body

Answer

Tail

Answer

Uncinate process

Question 3

What is the most common functional neuroendocrine tumor of the pancreas associated with Multiple Endocrine Neoplasia type 1 (MEN1)?

Accepted Answer

Gastrinoma

Answer

Glucagonoma

Answer

VIPoma

Answer

Somatostatinoma

Question 4

Which cystic neoplasm of the pancreas has a dismal prognosis?

Accepted Answer

Ductal adenocarcinoma with cystic degeneration

Answer

Serous cystadenoma

Answer

Mucinous cystic neoplasm

Answer

Solid pseudopapillary neoplasm

Question 5

A 42-year-old female was diagnosed with a cystic neoplasm of the pancreas containing ovarian-type stroma. What is the most likely diagnosis?

Accepted Answer

Mucinous cystadenoma

Answer

Serous cystadenoma

Answer

Solid pseudopapillary neoplasm

Answer

Intraductal papillary mucinous neoplasm

Question 6

The term "pseudo" used in "pseudocyst" is due to its:

Accepted Answer

Lining

Answer

Contents

Answer

Site

Answer

Course

Question 7

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

Focus of ovarian stroma in it

Question 8

A 55-year-old man presents with jaundice. Ultrasonography reveals a 5 cm mass in the head of the pancreas. Endoscopic retrograde cholangiopancreatography with cytologic sampling shows cells with large hyperchromatic nuclei and a high nuclear/cytoplasmic ratio. Small glands composed of these cells are also present in the cytologic preparation. The overall prognosis for this patient is most similar to that of a patient with which of the following malignancies?

Accepted Answer

Adenocarcinoma of the oesophagus

Answer

Adenocarcinoma of the breast

Answer

Adenocarcinoma of the colon

Answer

Adenocarcinoma of the prostate

Question 9

What is the most common gene associated with pancreatic cancer?

Accepted Answer

KRAS

Answer

SMAD

Answer

P53

Answer

Rb

Question 10

A 60-year-old alcoholic man presents with a 6-month history of recurrent epigastric pain, progressive weight loss, and foul-smelling diarrhea. The abdominal pain is now almost constant and intractable. An X-ray film of the abdomen reveals multiple areas of calcification in the mid-abdomen. Which of the following is the most likely diagnosis?

Accepted Answer

Chronic pancreatitis

Answer

Carcinoid syndrome

Answer

Crohn disease

Answer

Insulinoma

Pancreatic Pathology — MCQs

Pancreatic Pathology — MCQs

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