What’s your diagnosis based on these images of the fetal abdomen?

Crossed fused ectopia with fetal hydronephrosis

Crossed fused ectopia of the kidneys with fetal hydronephrosis involving both moieties

Both fetal kidneys appear to be partially fused and located on the right side of the fetal spine. Both moieties show evidence of hydronephrosis (swollen kidneys), which is a known complication of this anomaly. Left to right ectopia is more common in this congenital malformation.

Challenge your diagnostic skills: Can you identify this rare congenital malformation in the fetal abdomen?