Question

Which of the following findings is considered a Major diagnostic criterion for chronic pancreatitis according to the Rosemont EUS classification?

• A. Main pancreatic duct calculi
• B. Dilated main duct $>$ 3.5 mm
• C. Pancreatic cysts $\ge$2 mm
• D. Dilated side-branch ducts

Hint:

Rosemont Criteria (EUS for Chronic Pancreatitis):
- Major A: "Stones" (Parenchymal calculi with shadowing OR Main duct calculi).
- Major B: "Honeycomb lobularity".
- Everything else (dilated ducts, cysts, non-shadowing foci) is a Minor criterion.

Answer 1

The Correct Option is A

Concept:
The Rosemont classification system standardizes the Endoscopic Ultrasound (EUS) diagnosis of chronic pancreatitis based on specific parenchymal and ductal morphological changes, categorizing them into Major and Minor criteria.
Explanation:
• To prevent the overdiagnosis of chronic pancreatitis on EUS, the Rosemont criteria assign stringent weights to sonographic findings.

• Major Criteria are divided into Major A and Major B:
- Major A: Hyperechoic foci with shadowing (parenchymal calculi) and Main pancreatic duct calculi. These findings are highly specific for chronic disease.
- Major B: Lobularity with honeycombing (a specific parenchymal network pattern).

• Minor Criteria are less specific and include parenchymal and ductal changes such as:
- Ductal changes: Dilated main pancreatic duct ($\ge$ 3.5 mm in the body, Option B), irregular duct contour, dilated side branches (Option D), and hyperechoic duct margins.
- Parenchymal changes: Hyperechoic foci without shadowing, lobularity without honeycombing, and parenchymal cysts (Option C).

• Therefore, only main duct calculi qualify as a Major criterion among the given choices.
Final Answer:
According to the Rosemont EUS classification, the presence of main pancreatic duct calculi is a Major A diagnostic criterion for chronic pancreatitis.