Focal segmental glomerular sclerosis in a patient with neurofibromatosis type I.

A 22 -year-old white man was found to have a serum creatinine level of 3.4 mg/dL (259 micromol/L) and 6 g of protein in a 24-hour urine collection. Laboratory studies performed 5 years prior showed no evidence of abnormal renal function.