What is Known:
• Mesenteric adenitis is a self-limiting inflammatory condition with well-characterized clinical presentation and imaging features.
• A total duration of symptoms of ≤ 4 weeks is usually hypothesized.
What is New:
• Symptoms persist for 3 to 10 weeks in half of the patients.
• At presentation, clinical and laboratory characteristics are similar in children with symptoms persisting for 2 weeks or less and in those with 45 symptoms persisting for 3–10 weeks.