It called Duplicata incompleta with caudal regression syndrome
This is a case of a 36-year-old G1 P0 who was treated for infertility for the past 16 years. This was her first pregnancy after in vitro-fertilization. It was a twin pregnancy after a transfer of two embryos.
Patient went into a preterm labor and delivered at 31 weeks of gestation. The first baby was a healthy boy of 1800 grams with Apgar scores 6/7/7 (1st/5th/10th minute).
The second baby had multiple malformations. The head showed signs of duplication with 2 pairs of eyes, double chin, wide mouth. The lower extremities were malformed with caudal regression syndrome. Our final diagnosis based on the clinical findings was duplicata incompleta; monocephalus diprosopus tetraophtalmos (“Diprosopus” means “two-faced” in Greek), so called monocephalic diprosopus.