Son has enlarged appendix but not inflamed. what does it mean?

Normal: I presume that the character of the appendix was found on ultrasound or ct abdominal examination. Baseline diameter of appendix is about 5-6mm. However there are exceptions with appendix distended by air or fluid and having a larger diameter. If no inflammation associated with it and no large blocking stone , appendicolith, then appendix is normal. It is normal variation being larger than expected.