<prompt> All of the following are causes of acalculous cholecystitis exceptBile duct strictureSchitosomaProlonged TPNMajor operations  <response>: Causes of Acalculous cholecystitis Common causes Elderly and critically ill patients after trauma Burns Longterm TPN Major operationsAbdominal aneurysm repair and cardiopulmonary bypass Diabetes mellitus Uncommon causes Vasculitis Obstructing GB adenocarcinoma GB torsion Parasitic infestation Unusual bacterial infection - Leptospira, streptococcus, salmonella , Vibrio cholera Ref: Harrisons 19th edition Pgno : 2081 