Background: Gallbladder perforation secondary to cholecystitis are rarely seen. Gallbladder perforation is associated with intra or extra-hepatic abscesses and peritonitis and is high mortality rates. We report a case of gallbladder perforation. Case presentation: An 80 year old male patient was admitted to our hospital with abdominal pain. The aspartate aminotransferase, alanine aminotransferase and C-reactive protein values of the patient were high. The patient underwent intravenous contrast-enhanced abdominal computed tomography. Abdominal computed tomography showed a hydropic gallbladder, loculated fluid collections surrounding the liver and an increase in the gallbladder wall thickness. There was also defect in fundus of the gallbladder. The patient was operated based on clinical and radiological findings. Operative findings confirmed preoperative radiological findings. Conclusion: Gallbladder perforation is rare but in such cases early diagnosis is of vital importance. Ultrasonography and computed tomography are the imaging modalities for the diagnosis of gallbladder perforation.