RESUMEN
AIM: As more data about coronavirus disease-2019 (COVID-19) has been gathered it has become evident that children who have had or have been exposed to COVID-19 can develop a rare complication; multisystem inflammatory syndrome in children (MIS-C). We report the case of a 9-year-old boy, who was brought to the emergency room with suspected acute abdomen and was diagnosed with MIS-C. METHODS: The patient had had a positive molecular test for COVID-19, 25 days earlier and fever that started 4 days prior to presentation, He tested negative for COVID on arrival at the emergency room. After physical examination, and diagnostic tests were performed the differential diagnosis included appendiceal inflammation and MIS-C. Surgical exploration was performed laparoscopically. RESULTS: The immune morphological picture was reactive lymphogranular hyperplasia. Postoperatively the abdominal symptoms improved rapidly but the patient developed diffuse erythema as well as some cardiovascular and neurological disturbances. The patient was discharged on postoperative day 14 in good general condition with a diagnosis of MIS-C. CONCLUSIONS: In patients with a recent positive COVID test and mainly gastroenterological manifestations surgical exploration is necessary in order to prevent delayed diagnosis and inadequate/inappropriate treatment. KEY WORDS: Acute abdomen, COVID-19, MIS-C, Gastrointestinal symptoms.