Please help! What is the most common missed diagnosis for appendicitiis?

Not missed if Examin. Acute appendicitis is a surgical emergency and has to be diagnosed and if diagnosis confirmed by History Physical,Blood count and if imaging if needed to confirm the diagnosis like Cat Scan or ultrasound.If one does not seek medical help the appendix can rupture and cause abscess/peritonitis/sepsis and can be life threatening One can not afford to miss the diagnosis.