Appendicitis is the most common indication for emergent abdominal surgery in childhood, and early diagnosis followed by an appendectomy before gangrene or perforation develops is important for a good prognosis. But diagnosing appendicitis in children is challenging, because symptoms such as fever, abdominal pain, vomiting, and irritability are neither sensitive nor specific in children, and a physical examination can be difficult in an apprehensive and uncomfortable young child. Delayed diagnoses are common in young children. Laboratory testing and imaging studies, such as ultrasound and computed tomography, are helpful in evaluating appendicitis in children. In this study, we present a 2-year-old boy diagnosed with acute enterocolitis and acute tonsillitis whose appendicitis progressed to rupture with abscess formation during hospitalization. His condition improved after surgical intervention.