EDN and Eosinophilic Esophagitis

3 tubes of blood for research purposes (maximum 9.6 mL for children weighing 5-12 kg, 16 mL between 12-20 kg, 24 mL between 20 and 30 kg, and 56 mL for those weighing over 30 kg) will be taken from the catheter necessary for general anaesthesia.

4 additional esophageal biopsies will be taken during digestive endoscopy, in the pathological zone or in the lower third of the esophagus by default.

A esophageal brushing will be done during digestive endoscopy.

A urine sample will be collected during hospitalization for digestive endoscopy.

A stool sample will be collected during hospitalization for digestive endoscopy.