Monarch Disease Ontology identifier MONDO_0018178 (intestinal lymphangiectasia) is dilatation of the intestinal lymphatic system usually caused by an obstruction in the intestinal wall. It may be congenital or acquired and is characterized by diarrhea; hypoproteinemia; peripheral and/or abdominal edema; and protein-losing enteropathies. Also known as: intestinal lymphangiectasia (disease).