Appendicitis

My six year old was sent for a CT scan today as she presented with symptoms of appendicitis.  Severe lower abdominal pain.  The pain intensified when walking or if she coughed.  She is also complaining with right leg pain when she moves the leg.  She is also running fever.  The CT showed that her appendix was 5.5 cm. I was told they wouldnt do anything for her unless it was 6 cm or larger.  Is it possible that this will go away or is it a good chance that she will get worse and the appendix may have to be removed?  She I take her for a second opinion?

[mammo]

Appendicitis
Appendicitis is an inflammation of the appendix, a 3 1/2-inch-long tube of tissue that extends from the large intestine. No one is absolutely certain what the function of the appendix is. One thing we do know: We can live without it, without apparent consequences.

Appendicitis is a medical emergency that requires prompt surgery to remove the appendix. Left untreated, an inflamed appendix will eventually burst, or perforate, spilling infectious materials into the abdominal cavity. This can lead to peritonitis, a serious inflammation of the abdominal cavity's lining (the peritoneum) that can be fatal unless it is treated quickly with strong antibiotics.