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The most common neoplasias at pediatric age are tumors of the hematopoietic system, tumors of the central and peripheral nervous systems, retinoblastoma, and renal tumors. Renal tumors are the second leading cause of retroperitoneal masses and more than 90% are malignant primary tumors: specifically Wilms' tumor. Wilms' tumor is the most common malignant abdominal neoplasia in pediatric patients. Ninety percent of all cases occur before 10 years of age. It represents the seventh leading cause of cancer in Mexico City and may occur bilaterally in 5 to 10% of cases. We present the case of a male patient of 82 days of extrauterine life with fever, increased abdominal volume, and hematuria. The histopathological study confirmed a synchronous bilateral Wilms' tumor. [ABSTRACT FROM AUTHOR]