Growing renal mass: mesoblastic nephroma in pregnancy

Case report: A 41-year-old GIII/PI presented for the first time at 30+3 weeks of pregnancy with a newly diagnosed fetal abdominal mass, which hadn't been visible 6 weeks before. At present, sonography reveals a 66 × 56 × 66 mm left renal mass with abundant vascularisation and a macrosomic male fetus. The right kidney is normal in size and shape. The consulted pediatric nephrologist suspects a wilms tumor or a mesoblastic nephroma. Fetal MRT shows a solid mass, 160 ml in volume, the radiologists suspect a mesoblastic nephroma. Because of the maternal pain and respiratory distress of the severe polyhydramnios amni…