“…The esophageal biopsy plays an important role, as much in cases of normal examinations or mild abnormalities as in cases of erosive esophagitis. If the edema, erythema and friability commonly observed in children are non-specific, findings from histological examination and morphometric studies of the esophageal mucosa allow an etiologic diagnosis of eosinophilic esophagitis if characteristic alterations such as eosinophil infiltrates, increased total epithelial and basal cell thickness, and elongation of stromal papillae are seen [47]. Furthermore, histopathology allows the investigation of other diagnostic possibilities such as infectious esophagitis (Herpes virus, Cytomegalovirus, Candida), Barrett's esophagus, dysplasia, adenocarcinoma, Crohn disease, and others.…”