A 45-year-old obese woman presents with severe epigastric pain radiating to the back, nausea, and vomiting 8 hours after a fatty meal. Serum lipase is 8× the upper limit of normal. Trans-abdominal ultrasound shows the structure marked **A** to be diffusely enlarged and hypoechoic compared with the adjacent liver, with indistinct margins and a small rim of peripancreatic fluid. The gallbladder contains multiple echogenic stones with posterior acoustic shadowing. Based on the Revised Atlanta Classification 2012, what is the PRIMARY role of ultrasound in confirming the diagnosis of acute pancreatitis in this patient?
A. To definitively diagnose acute pancreatitis based on the appearance of the hypoechoic edematous pancreas alone
B. To identify the aetiology of pancreatitis (gallstones, dilated CBD, biliary pathology) rather than to establish the diagnosis itself, which is clinical and biochemical
C. To stage the severity of acute pancreatitis and assess for pancreatic necrosis using the CT severity index
D. To determine the presence of organ failure and guide ICU admission decisions
Explanation
Why option 1 is correct
The Revised Atlanta Classification 2012 and ACG Pancreatitis Guidelines emphasize that diagnosis of acute pancreatitis requires 2 of 3 criteria: typical pain, lipase >3× ULN, and characteristic imaging. The PRIMARY role of ultrasound is NOT to diagnose pancreatitis itself (which is established clinically and biochemically) but to identify the underlying AETIOLOGY—particularly gallstones, common bile duct dilation, and other biliary pathology. In this case, the ultrasound correctly identifies gallstones as the cause. The hypoechoic edematous appearance of the structure marked A (pancreas) is a supportive finding but is not the primary diagnostic purpose of imaging.
Why each distractor is wrong
Option 2: Staging severity and assessing for necrosis is the role of CONTRAST-ENHANCED CT (CECT) performed at 72–96 hours, not ultrasound. CT severity index and Balthazar grading are CT-based tools. Ultrasound cannot reliably detect necrosis.
Option 3: Ultrasound alone cannot definitively diagnose acute pancreatitis. The Revised Atlanta Classification requires a combination of clinical presentation, biochemical markers (lipase >3× ULN), and imaging. The hypoechoic pancreas is supportive but not diagnostic in isolation, and the pancreas may be obscured by gas in 25–35% of cases.
Option 4: Assessment of organ failure and ICU admission decisions are clinical and biochemical determinations (based on SOFA score, lactate, organ dysfunction), not primarily an imaging function. Ultrasound does not assess systemic complications.
High-YieldNEET PG
In acute pancreatitis, ultrasound diagnoses the CAUSE (gallstones, CBD obstruction); clinical + biochemical criteria diagnose the DISEASE itself. CECT is reserved for severity staging and necrosis detection.
Revised Atlanta Classification 2012; ACG Pancreatitis Guidelines
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