A 9-year-old child with pain in the right lower quadrant is likely suffering from?

A 9-year-old child presenting with pain in the right lower quadrant is most likely suffering from appendicitis. This condition is characterized by inflammation of the appendix, and the typical symptom pattern includes abdominal pain that often starts near the belly button before moving to the right lower quadrant. The pain typically becomes more intense over time, and additional symptoms may include fever, nausea, vomiting, and changes in appetite.

In children, appendicitis is one of the most common causes of abdominal pain that requires surgical intervention, and its early recognition is crucial because a ruptured appendix can lead to serious complications. While other conditions can cause abdominal pain, the specific localization to the right lower quadrant and the age of the child strongly point towards appendicitis as the most likely diagnosis in this case.