Polycythemia in pediatric renal transplantation.

Post-transplant polycythemia is not uncommon in adult patients and is usually transient, responding to phlebotomy. Five pediatric patients developed erythrocytosis post-transplantation. Three patients had end-stage renal disease due to cystinosis, one had reflux glomerulopathy and one had focal glomerular sclerosis. The probable causes of the polycythemia were graft arterial stenosis in three patients. In one, polycythemia occurred with nephrosis. Polycythemia with hypertension may indicate the presence of arterial stenosis in children post-transplantation.