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Response to preoperative chemotherapy according to histological subtype, depicted per lesion (total evaluable n = 58, Wilms tumor = 33, nephrogenic rests n = 25). LR: low-risk; IR: intermediate-risk; DA: diffuse anaplasia; high-risk blastemal type; NR: nephrogenic rest; NB: nephroblastomatosis. Response: >10% volume reduction of tumor, stable: less than 10% increase or decrease in tumor volume, progressive: >10% increase in tumor volume.
