2016 Volume 52 Issue 6 Pages 1192-1196
Congenital mesoblastic nephroma is a rare renal tumor mainly observed in neonates and young infants. We report here a case of congenital mesoblastic nephroma (CMN) with renal vein invasion. An abdominal mass was noted on fetal echograms at the 36th week of gestation. A postnatal imaging study revealed a solid mass measuring 7 cm in diameter, arising from the upper pole of the right kidney. On diagnosis as CMN, surgery was planned. A right radical nephrectomy was performed on day 8 after birth. A pathological specimen showed CMN of the cellular type with renal vein invasion. The cut ends of the renal vein were tumor-cell-positive. The diagnosis was stage 3 CMN of the cellular type. Neither postoperative radiation nor adjuvant chemotherapy was considered necessary because the patient was less than three months old. The postoperative course was uneventful and no sign of recurrence was found within 21 months after the operation. On the basis of experience with our case, we consider that postoperative chemotherapy can be avoided in a neonatal case of stage 3 CMN.
