[Wilms' tumor in a horseshoe kidney: organ-sparing treatment].

Horseshoe kidney is the most typical kidney fusion anomaly among children (0.25%) and associated with various urological and non-urological abnormalities. Wilms' tumor is the most common malignant neoplasm of kidneys and the third most common solid malignant neoplasm in pediatrics. Wilms' tumor in a horseshoe kidney is rare (0.4-0.9%). The authors present Wilms' tumor in a horseshoe kidney and describe diagnostic methods, neoadjuvant chemotherapy and tumor resection.