Ultrasound of Acute Cholecystitis
In this radiology lecture, we review the ultrasound appearance of acute cholecystitis, including gangrenous and emphysematous cholecystitis!
Key teaching points include:
- Acute cholecystitis = Acute gallbladder inflammation.
- Most often (95%) caused by an impacted, obstructing gallstone in the cystic duct or gallbladder neck = Acute calculous cholecystitis.
- Clinically presents as persistent RUQ pain that may radiate to right shoulder, often with N/V and fever.
- Ultrasound findings of uncomplicated acute cholecystitis: Gallstones, sonographic Murphy sign, gallbladder wall thickening (greater than 3 mm) and edema, gallbladder distention (greater than 4 cm short axis), and pericholecystic fluid.
- Sonographic Murphy sign = Maximal abdominal tenderness from transducer pressure over gallbladder. PPV of gallstones and a positive sonographic Murphy sign = 92%.
- Pericholecystic fluid occurs in less than 20% of patients with acute cholecystitis, usually seen in more advanced cases.
- Gangrenous cholecystitis = Most common complication of acute cholecystitis. Ischemia with necrosis of gallbladder wall. Increased mortality compared to uncomplicated acute cholecystitis.
- Ultrasound findings of gangrenous cholecystitis: Wall disruption, ulceration, mucosal irregularity, and/or focal bulge, sloughed mucosal membranes, pericholecystic fluid, less likely to have positive Murphy sign, and increased risk of perforation (usually at fundus).
- Emphysematous cholecystitis = Gallbladder wall necrosis with gas formation in wall and/or lumen. More common in elderly men with underlying diabetes. Higher risk of perforation, rapid progression, and increased mortality compared to uncomplicated acute cholecystitis. Emergent surgical intervention typically required.
- Ultrasound findings of emphysematous cholecystitis: Bright reflectors from nondependent portions of gallbladder wall, dirty posterior acoustic shadowing, and ring-down artifact. CT can confirm if necessary.
To learn more about the Samsung RS85 Prestige ultrasound system, please visit: https://www.bostonimaging.com/rs85-prestige-ultrasound-system-4
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