A rare benign gastrointestinal disease characterized by the presence of abnormal and nonspecific gastro-intestinal (GI) manifestations, associated with an eosinophilic infiltration of the GI tract, which can affect several segments and involve several layers within the GI wall.

Hyperplasia of the biliary tree, as manifested by increased size of bile ducts, dilated lumen, and histologically by an increased number of epithelial cells or hyperplasia.