-Hemorrhagic cholecystitis: occasionally active hemorrhage is accompanying severe /gangrenous cholecystitis. Check for dense blood on non-enhanced CT and active bleeding in the multiphasic enhanced study, also cystic artery pseudoaneurysm may be detected
-Necrotic pancreatitis Case is associated with perforated cholecystitis
-IgG4 related disease results in sclerosing cholangitis
-Lemmel syndrome: diverticulum of the second part of the duodenum causing obstructive jaundice
-Cystic artery: the main artery supplying the gallbladder. It most commonly arises from the right hepatic artery within the Calot triangle and courses posterior to the hepatic/cystic duct. Many variations in the origin (celiac trunk or SMA or any of their branches), course (within or outside the Calot triangle), or relation to the bile ducts ( may course anterior)
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