Pancreatic Pathology Practice Questions

Q: A 55-year-old woman with a history of chronic pancreatitis develops jaundice and weight loss. A CT scan reveals a mass at the head of the pancreas. Which histological feature is most suggestive of pancreatic adenocarcinoma?

Perineural invasion. ***Perineural invasion*** - **Perineural invasion** is a classic and highly characteristic histological feature of **pancreatic adenocarcinoma**, indicating the malignant cells' tendency to invade and spread along nerves. - Its presence is a significant prognostic indicator, often associated with a higher likelihood of local recurrence and distant metastasis. *Acinar cell atrophy* - **Acinar cell atrophy** is a common finding in **chronic pancreatitis** due to duct obstruction and inflammation, and it is not specific to malignancy. - While pancreatic adenocarcinoma can cause obstruction leading to atrophy, atrophy itself is not a diagnostic feature of the cancer. *Islet cell hyperplasia* - **Islet cell hyperplasia** involves an increase in the number of **islet cells** and is typically seen in conditions like nesidioblastosis or in response to chronic hypoglycemia. - It is not a feature of **pancreatic adenocarcinoma**; in fact, chronic pancreatitis (a risk factor) can sometimes lead to islet destruction, not hyperplasia. *Fibrosis and inflammation* - **Fibrosis and inflammation** are hallmarks of **chronic pancreatitis** and can also be present in the desmoplastic reaction surrounding pancreatic tumors. - While present, these features are non-specific and are not diagnostic for **pancreatic adenocarcinoma** itself, as they indicate a chronic inflammatory process.

Q: In which type of cancer is K-ras mutation most commonly observed?

Pancreatic cancer. ***Pancreatic carcinoma*** - K-ras mutations are found in **over 90%** of pancreatic adenocarcinomas, making it a hallmark of this cancer type [1]. - These mutations are involved in the **initiation and progression** of pancreatic tumors [1]. *Hepatic carcinoma* - Hepatic carcinoma is more associated with mutations in **TP53** and **CTNNB1**, rather than K-ras mutations. - K-ras mutations are not a primary driver in the context of liver cancer development. *Prostate carcinoma* - Prostate carcinoma typically involves mutations in **PTEN** and **TMPRSS2-ERG** fusion genes, not K-ras. - K-ras mutations are not a significant feature in the pathogenesis of prostate cancer. *Gastric carcinoma* - Gastric carcinoma can have mutation involvement often related to **CDH1** and **TP53**, with variable K-ras mutation presence. - K-ras mutations are less frequent when compared to other mutations seen in gastric tumorigenesis. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. The Pancreas, pp. 897-898.

Q: What type of necrosis occurs in pancreatitis?

Fat. ***Fat*** - In pancreatitis, **fat necrosis** occurs due to the action of lipolytic enzymes on the adipose tissue, leading to the destruction of fat [1]. - Characteristically, it is associated with **calcium deposits** (saponification) in the areas of necrosis [1]. *Fibrinoid* - Fibrinoid necrosis is typically related to **immune-mediated vascular damage**, not a feature of pancreatitis. - It often presents in conditions like **vasculitis** and **autoimmune diseases.** *Caseous* - Caseous necrosis is primarily associated with **tuberculosis** and granulomatous infections, characterized by the formation of **cheese-like necrotic tissue**. - It does not relate to **pancreatic enzyme activity** or fat destruction seen in pancreatitis. *Coagulative* - Coagulative necrosis occurs in cases of **ischemia** or **infarction**, typically in solid organs such as the heart or kidney. - It involves the preservation of the tissue architecture but not in the context of pancreatic necrosis. **References:** [1] Kumar V, Abbas AK, et al.. Robbins and Cotran Pathologic Basis of Disease. 9th ed. Cellular Responses to Stress and Toxic Insults: Adaptation, Injury, and Death, p. 55.

Q: Which of the following is the most common tumor of the pancreas?

Pancreatic adenocarcinoma. ***Duct cell adeno carcinoma*** - The most common tumor of the pancreas, accounting for approximately **85% of cases**, is pancreatic ductal adenocarcinoma [1][3]. - Characterized by **invasive growth** and often presents late with symptoms such as **weight loss** and **jaundice** [1][2]. *Adeno-squamous cell carcinoma* - This type of carcinoma is **rare** and not the typical presentation seen in pancreatic tumors. - It usually has a poorer prognosis compared to ductal adenocarcinoma and is not the most common form. *Squamous cell carcinoma* - While squamous cell carcinoma can occur in various organs, it is **not typically associated** with the pancreas. - This type of cancer is more common in the **lungs** and does not represent the predominant pancreatic tumor type. *Adeno-carcinoma* - This term is a general category and does not specify the type; it can refer to multiple neoplasms besides **ductal adenocarcinoma**. - Hence, it is not an accurate or specific answer for the most common tumor of the pancreas. **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. 899-900. [3] Cross SS. Underwood's Pathology: A Clinical Approach. 6th ed. Common Clinical Problems From Liver And Biliary System Disease, pp. 407-408.

Q: Cells central to the production of pancreatic fibrosis are?

Stellate cells. ***Stellate cells*** - **Pancreatic stellate cells** (PSCs) play a crucial role in the development of **pancreatic fibrosis** by producing and secreting extracellular matrix components. - Upon activation by injury or inflammation, PSCs transform into myofibroblast-like cells, leading to increased **collagen deposition** and scarring. *Alpha cells* - **Alpha cells** are endocrine cells in the pancreatic islets responsible for producing and secreting **glucagon**, which raises blood glucose levels. - They are not directly involved in the **fibrotic process** of the pancreas. *Beta cells* - **Beta cells** are endocrine cells in the pancreatic islets that produce and secrete **insulin**, which lowers blood glucose levels. - While dysfunction or death of beta cells is central to diabetes, they are not primarily responsible for **pancreatic fibrosis**. *Acinar cells* - **Acinar cells** are exocrine cells of the pancreas that produce and secrete **digestive enzymes** into the pancreatic duct. - While injury to acinar cells can lead to inflammation (e.g., pancreatitis), they are not the primary drivers of **collagen synthesis** and **fibrosis**.

Q: Most frequently altered oncogene in pancreatic cancer is:

K-RAS. ***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 1

A 55-year-old woman with a history of chronic pancreatitis develops jaundice and weight loss. A CT scan reveals a mass at the head of the pancreas. Which histological feature is most suggestive of pancreatic adenocarcinoma?

Accepted Answer

Perineural invasion

Answer

Acinar cell atrophy

Answer

Islet cell hyperplasia

Answer

Fibrosis and inflammation

Question 2

A 40-year-old man with chronic pancreatitis develops jaundice. Imaging reveals a mass in the pancreas. Which molecular test is most relevant for diagnosing pancreatic adenocarcinoma?

Accepted Answer

KRAS mutation analysis

Answer

TP53 mutation analysis

Answer

CA 19-9 serum levels

Answer

BRCA1/2 mutation testing

Question 3

In which type of cancer is K-ras mutation most commonly observed?

Accepted Answer

Pancreatic cancer

Answer

Prostate cancer

Answer

Gastric cancer

Answer

Liver cancer

Question 4

What type of necrosis occurs in pancreatitis?

Accepted Answer

Fat

Answer

Fibrinoid

Answer

Coagulative

Answer

Caseous

Question 5

Which of the following is the most common tumor of the pancreas?

Accepted Answer

Pancreatic adenocarcinoma

Answer

Squamous cell carcinoma

Answer

Adeno-squamous cell carcinoma

Answer

Neuroendocrine tumor

Question 6

Cells central to the production of pancreatic fibrosis are?

Accepted Answer

Stellate cells

Answer

Alpha cells

Answer

Beta cells

Answer

Acinar cells

Question 7

Most frequently altered oncogene in pancreatic cancer is:

Accepted Answer

K-RAS

Answer

CDKN2A

Answer

SMAD4

Answer

TP53

Pancreatic Pathology — MCQs

Pancreatic Pathology — MCQs

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