CholecystostomyCholecystitisCholecystitis, AcuteAcalculous CholecystitisGallbladderCholecystographyCholecystectomyEmphysematous CholecystitisCholecystectomy, LaparoscopicImino AcidsAcute DiseaseGallbladder DiseasesTokyoGallbladder NeoplasmsTechnetium Tc 99m DisofeninCholelithiasisXanthomatosisCholecystolithiasisGallstonesGangreneRetrospective Studies