A 42 year old female who is obese comes with severe upper abdominal pain and right shoulder tip pain with a temperature of 37.8C. She has 5 children. What investigation should we do for diagnosis?

The key is US abdomen. [The diagnosis is cholecystitis. The diagnosis of cholecystitis is suggested by the history (abdominal pain, nausea, vomiting, fever) and physical examinations in addition to laboratory and ultrasonographic testing. Boas's sign which is pain in the area below the right scapula, can be a symptom of acute cholecystitis. Pnemonic for cholecystitis is 5 “f”. Fat, female, fair, forty, fertile cholecystitis].