<prompt> Child presents after trauma to head with hyponatremia, volume depletion and increased excretion of urinary Na . What is the probable diagnosis?Cerebral salt wasting syndromeSIADHAdrenal hemorrhageAutonomic failure  <response>: Answer- A. Cerebral salt wasting syndromeElectrolyte imbalance is common in traumatic brain injury TBI, and contributes to brain swelling and to causing seizures.Cerebral salt wasting, a poorly understood form of excretory dysregulation in association with brain insult, leads to volume depletion and hlponatraemia. 