**Complexity of Differentiating Cerebral-Renal Salt Wasting from SIADH, Emerging Importance of Determining Fractional Urate Excretion**

John K. Maesaka, Louis Imbriano, Shayan Shirazian and Nobuyuki Miyawaki *Department of Medicine, Winthrop-University Hospital, Mineola, NY, SUNY Medical School, Stony Brook, NY, USA* 
