Ultrasonic diagnosis of nephroblastomas in preschool children

Nephroblastoma, or Wilms tumor, is a congenital embryonal malignant tumor of the kidney with an incidence of 1:100,000 children under the age of 14 years per year. The tumor is detected mainly at the age of 1-6 years; girls and boys are affected with equal frequency. In 5% of cases, bilateral nephroblastomas are observed. Up to 1/3 of patients with nephroblastoma have malformations: aniridia, hemihypertrophy, malformations of the genitourinary system, malformations of the musculoskeletal system associated with Beckwith-Wiedemann syndrome, WAGR syndrome, Denys-Drash syndrome, neurofibromatosis type I.