Abstract
Nephroblastomas are the most common malignant renal tumors in childhood. According to the guidelines of the SIOP (Société Internationale d'Oncologie Pédiatrique) and GPOH (Gesellschaft für Pädiatrische Onkologie und Hämatologie) pre-operative chemotherapy can be started without histological confirmation and thus initial imaging studies, in particular ultrasound, play an outstanding role for diagnostic purposes.
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