A 52-year-old obese woman presents with 36 hours of severe right upper quadrant pain radiating to the right scapula, fever (38.5°C), and a positive Murphy sign. Right upper quadrant ultrasound is performed. The structure marked **A** in the diagram measures 6 mm and shows mural striations. Which of the following best explains the pathophysiological significance of this finding in acute cholecystitis?
A. Suggests bacterial invasion of the gallbladder wall with early gangrenous change
B. Represents fibrosis of the gallbladder from chronic cholecystitis and recurrent biliary colic
C. Indicates mucosal edema and inflammation secondary to cystic duct obstruction and gallbladder distention
D. Reflects hepatic synthetic dysfunction and portal hypertension
Explanation
Why "Indicates mucosal edema and inflammation secondary to cystic duct obstruction and gallbladder distention" is right
The structure marked A is gallbladder wall thickening (>3 mm, in this case 6 mm with mural striations). According to the Tokyo Guidelines 2018 and standard pathophysiology of acute cholecystitis, wall thickening with striations represents edema and inflammation of the gallbladder wall secondary to cystic duct obstruction. The obstruction causes gallbladder distention, which leads to mucosal damage, prostaglandin release, ischemia, and secondary inflammation—all hallmarks of acute cholecystitis. This finding is one of the key diagnostic criteria on ultrasound (normal <3 mm).
Why each distractor is wrong
Represents fibrosis of the gallbladder from chronic cholecystitis and recurrent biliary colic: Fibrosis is a chronic process seen in chronic cholecystitis, not the acute inflammatory edema with striations characteristic of acute cholecystitis. The mural striations specifically indicate edema, not fibrosis.
Suggests bacterial invasion of the gallbladder wall with early gangrenous change: While bacterial infection does occur in acute cholecystitis (secondary to obstruction), gangrenous change is a late complication involving necrosis of the wall. The imaging findings here (wall thickening with striations and pericholecystic fluid) indicate acute inflammation, not necrosis.
Reflects hepatic synthetic dysfunction and portal hypertension: Gallbladder wall thickening in acute cholecystitis is a local inflammatory process, not a manifestation of hepatic dysfunction or portal hypertension. This distractor confuses a different pathophysiological mechanism entirely.
High-YieldNEET PG
Gallbladder wall thickening >3 mm with mural striations on ultrasound is a hallmark sign of acute cholecystitis reflecting edema and inflammation from cystic duct obstruction; normal wall thickness is <3 mm.
Tokyo Guidelines 2018; SAGES Guidelines for Laparoscopic Cholecystectomy
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