Case Presentation: A 63-year-old male presents to the hospital with complaints of one-day history of weakness, dizziness. His outpatient blood work demonstrated a serum sodium level of 124 mEq/L, and a creatinine of 3.1 mg/dL. His medical history was significant for high-grade urothelial bladder carcinoma status post radical cysto-prostatectomy, neobladder urinary diversion, and MVAC (methotrexate, [...]