An 83-year-old woman was admitted to our hospital because of right upper abdominal pain with acute onset. Computed tomography demonstrated a free-floating distended gallbladder with a tortuous cystic duct. Gallbladder volvulus was diagnosed preoperatively and laparoscopic cholecystectomy was performed successfully. Delayed diagnosis of gallbladder volvulus may have resulted in mortality in this case. A proper image study can lead to early surgical intervention and result in good prognosis.