Congenital mesoblastic nephroma (CMN) is the most common type of renal tumor in children younger than one year old. Prenatal diagnosis of this benign neoplasm can be achieved using sonography. New developments in sonographic technology, including color and power Doppler, and three-dimensional sonography have improved the detection and diagnosis of CMN in utero. Antenatal diagnosis will allow for optimal postpartum care of the baby. Furthermore, with experience, physicians and sonographers will be able to create a set of guidelines used to discriminate renal masses in utero. This report discusses several useful clinical tools when considering the prenatal diagnosis of congenital mesoblastic nephroma.
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