Chronic idiopathic hyponatremia in an elderly patient due to inappropriate antidiuretic hormone secretion (SIADH) syndrome Posted on March 22, 2020July 21, 2022 by admin CASE REPORT Hippokratia 2019, 23(1): 42-44 Kounatidis D, Liakopoulou C, Brozou V, Dimopoulou G, Vallianou N First Department of Internal Medicine, Evangelismos General Hospital, Athens, Greece