Cholecystogastric fistula is one of the rarest and most life-threatening complications of gallbladder stone disease. This disease can mimic other diseases such as perforated peptic ulcers and is too hard to be diagnosed preoperatively. It should be considered a significant differential diagnosis in patients with abdominal pain and cholecystitis symptoms.

Acute abdomen is a life-threatening condition caused by different incidences such as perforated peptic ulcers and acute appendicitis. This critical condition needs urgent investigation and treatment. The main diagnostic ways for acute pancreatitis are clinical examination and findings. It is essential to consider these two conditions in a patient simultaneously.