PLE-8306
A 6-year-old little girl was brought to the ER because of abdominal pain, which started 12 hours prior to the consultation. The history revealed that the patient had just recovered from acute nasopharyngitis. Physical examination showed stable vital signs, with the presence of voluntary guarding but no true rigidity, and diffuse abdominal tenderness rated as 5/10 in greatest intensity. What is the disease most often confused with acute appendicitis in children?