PAED-0449

A 7-year-old girl was brought to the hospital with complaints of fever. 5 days ago, she was taken to her GP with lower abdominal pain and leukocytes 3+ on urine dipstick. She was treated with trimethoprim. On examination, she is found to have a low-grade pyrexia, a CRP of 254 mg/L, and a palpable mass in the right iliac fossa. She is able to consume both solids and liquids. Based on the clinical scenario, what is the probable diagnosis and most appropriate management for this child?