Pelvic Wilms tumor in a child with an absent right kidney and spinal malformations.

Wilms tumor rarely occurs in other sites outside the kidney. Various congenital malformations often accompany Wilms tumor, but spinal deformations are rarely seen. We report a very rare association of multiple spinal malformations, right kidney absence, and pelvic Wilms tumor in a 21-month-old girl. The report includes a brief review of relevant literature.