disease has feature Right atrial enlargement familial idiopathic dilatation of the right atrium https://github.com/monarch-initiative/mondo/issues/6740 https://github.com/monarch-initiative/mondo/issues/6876 https://www.malacards.org/card/familial_idiopathic_dilatation_of_the_right_atrium familial idiopathic dilatation of the right atrium (disease) Idiopathic dilatation of the right atrium (IDRA) is a rare congenital heart malformation of unknown etiology that is characterized by an extremely dilated right atrium, and that is usually asymptomatic and fortuitously discovered by echocardiography or chest radiography, and can be sometimes associated with other anomalies such as atrial arrhythmias (e.g. atrial flutter, atrial fibrillation, supraventricular tachycardia), severe tricuspid regurgitation, or atrial thrombus that could lead to potentially life-threatening thromboembolic complications. icd11.foundation:2067836926 Orphanet:1677 MONDO:0015666 MEDGEN:901482 GARD:0018735 SCTID:716773002 familial idiopathic dilatation of the right atrium (disease) UMLS:C4274283 obsolete genetic cardiac malformation congenital heart malformation idiopathic disease