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Cholecystitis is inflammation of the gall bladder.
Cholecystitis is often caused by cholelithiasis (the presence of choleliths, or gallstones, in the gallbladder), with choleliths most commonly blocking the cystic duct directly. This leads to inspissation (thickening) of bile, bile stasis, and secondary infection by gut organisms, predominantly E. coli and Bacteroides species.
The gallbladder’s wall becomes inflamed. Extreme cases may result in necrosis and rupture. Inflammation often spreads to its outer covering, thus irritating surrounding structures such as the diaphragm and bowel.
Less commonly, in debilitated and trauma patients, the gallbladder may become inflamed and infected in the absence of cholelithiasis, and is known as acute acalculous cholecystitis.
Stones in the gallbladder may cause obstruction and the accompanying acute attack. The patient might develop a chronic, low-level inflammation which leads to a chronic cholecystitis, where the gallbladder is fibrotic and calcified.
Cholecystitis usually presents as a pain in the right upper quadrant. This is usually a constant, severe pain. The pain may be felt to ‘refer’ to the right flank or right scapular region at first.
This is usually accompanied by a low grade fever, vomiting and nausea.
More severe symptoms such as high fever, shock and jaundice indicate the development of complications such as abscess formation, perforation or ascending cholangitis. Another complication, gallstone ileus, occurs if the gallbladder perforates and forms a fistula with the nearby small bowel, leading to symptoms of intestinal obstruction.
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