Monarch Disease Ontology term MONDO_0017319 (hereditary elliptocytosis) (HE) is a rare clinically and genetically heterogeneous disorder of the red cell membrane characterized by manifestations ranging from mild to severe transfusion-dependent hemolytic anemia but with the majority of patients being asymptomatic. Also known as: HE, Hashimoto Encephalopathy, congenital elliptocytosis, hereditary ovalocytosis, ovalocytosis.