What are the diagnostic considerations if there is no gallbladder activity after a morphine challenge or after 4 hours in a patient with normal hepatic function and a normal biliary-to-bowel transit time?

What are the diagnostic considerations if there is no gallbladder activity after a morphine challenge or after 4 hours in a patient with normal hepatic function and a normal biliary-to-bowel transit time?

Acute cholecystitis (in the appropriate clinical setting)
Post cholecystectomy
Obstructing lesion of the cystic duct