[Trampolining-induced gross hematuria : Unmasking the nutcracker syndrome].

The case of a 12-year-old boy with sports-induced recurrent macrohematuria and left-sided flank pain is reported. After extensive laboratory and imaging diagnostics, the diagnosis of nutcracker syndrome is made based on the characteristic clinical manifestation. Under a conservative approach and abstention from the triggering sport, a clinical as well as image-morphologically confirmed maturation occurred.