What's that abdominal mass?

A woman was admitted for planned induction at 39+5 weeks gestation. This was her third pregnancy. She had two previous children who were fit and well. Antenatal scans showed a fetal intra-abdominal mass measuring 6.2×5.5×7 cm in the lower abdomen, which was compressing the bladder. The mass was thought to be originating from the ovary or the bowel. On postnatal examination, the baby girl had a distended and full abdomen. There was a right-sided abdominal mass palpable above the umbilicus and 3 cm in size. It was firm, smooth and mobile in consistency. She had a normal anus and external female genitalia, with evidence of a prolapsed vagina on crying. She had passed urine and opened her bowels. The baby was kept nil by mouth and on intravenous fluids until the abdominal radiography was performed. The image is shown in figure 1. Figure 1 Neonatal abdominal radiograph. Describe the findings noted on the abdominal radiograph? She was …