AVP and inappropriate ADH syndrome: The syndrome of inappropriate antidiuretic hormone secretion is a condition in which the antidiuretic hormone level is abnormally high irrespective of low serum osmolarity, causing sodium and water imbalance depicted by hypoosmolar hyponatremia and impairment in urinary water excretion except for kidney disease or other endocrinology influences resulting in antidiuretic hormone (ADH) release [7,8].