Mesoblastic nephroma: prenatal ultrasonographic and MRI features

Antenatal detection of mesoblastic nephroma by US is possible. Reviewing th e literature, we found 19 previously reported cases, only 1 of which underw ent prenatal MRI. We present a further case diagnosed by US and confirmed w ith MRI. The imaging findings and differential diagnoses are discussed. Ear ly and correct detection of this rare entity is of great interest, as it ma y facilitate prevention and management of severe obstetric and neonatal com plications such as polyhydramnios and prematurity. MRI can help to evaluate the origin and the morphological features of a fetal abdominal mass.