[Eosinophilic gastroduodenitis secondary to toxocariasis: a zoonosis simulating gastric lymphoma in children].

We describe the case of a pediatric patient with eosinophilic gastroduodenitis secondary to visceral toxocariasis, presenting with clinical, endoscopic, and histological features suggestive of gastric lymphoma. The patient, from a rural area, exhibited severe gastrointestinal symptoms, persistent hypereosinophilia, deep ulcerative lesions in the stomach and duodenum, as well as systemic involvement. After an extensive immunological, hematological, and infectious disease evaluation, the diagnosis was confirmed by positive serology for Toxocara canis. The patient showed favorable clinical evolution with antiparasitic therapy, immunomodulation, and intensive nutritional support. This case highlights the importance of considering infectious etiologies in the differential diagnosis of eosinophilic gastroduodenal disorders, particularly in pediatric patients with systemic involvement and a presentation mimicking malignant disease.