Hello doctor, I got both an ultrasound and a CT scan done. Ultrasound says: - Appendix is 5 mm - Appendicolith (stone) of 11 mm seen in the lumen CT scan says: - Appendix measures 5.6 mm - No appendicolith seen - No fat stranding or inflammation Currently, I have no fever or vomiting. But I sometimes feel mild pain in the lower right side of my abdomen.  It is not constant, comes and goes occasionally, and is not very severe — but I feel it a few times in a week. I'm confused: 1. Do I really have an appendicolith or was the ultrasound wrong? 2. Is any treatment or surgery required now? 3. Can this condition stay stable without surgery if I have no major symptoms?