Usefulness of Atopy Patch Test on a child with milk protein-induced enterocolitis syndrome: a case report.

We describe the case of a child affected by milk-protein induced enterocolitis, in which oral challenge with corn was performed without symptoms after a negative specific Atopy Patch Test. Food protein-induced enterocolitis syndrome (FPIES) is an uncommon nonIgE-mediated gastrointestinal food hypersensitivity of infancy, characterized by severe vomiting and diarrhea arising within 1 to 3 hours after ingestion of the causative food. Little is known about the pathophysiology of FPIES. The absence of food-specific IgE as demonstrated by negative skin prick tests suggests that the disease is not caused by an early onset IgE-mediated reaction. Atopy Patch Test has been described as sensitive and predictive in this syndrome. The hypothesis on the immunological pathogenesis has been discussed on the basis of literature data.