Dandy Walker Malformation in a Patient Presenting with Hyponatremia

Hyponatremia is defined as a serum sodium concentration of less than 135 mmol/L and is a common electrolyte abnormality. The most common causes of hyponatremia following central nervous system disorders are syndrome of inappropriate antidiuretic hormone secretion (SIADH) and cerebral salt wasting (CSW). In this case report, we discuss the diagnosis and treatment of CSW in a 30-year-old male patient with recurrent episodes of hyponatremia, in the context of the literature. CSW develops after central nervous system disorders and is characterized by hypovolemia, low serum osmolality, high urine osmolality, and high urine sodium levels.