A previously healthy 10-year-old girl presented with occasional routine blood pressure measurements by her pediatrician above the 99th percentile for her age, sex, and height. She had noted mild hand edema over the previous days and reported recent nocturia. She was taking no medications. Family history was unremarkable. The physical examination was without significant findings other than an elevated blood pressure of 139/113mm Hg. Urine tests showed boderline moderate albuminuria (albumin-creatinine ratio of 50mg/g).