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  • Title: Minimally conjoined omphalopagi: a consistent spectrum of anomalies.
    Author: Poenaru D, Uroz-Tristan J, Leclerc S, Murphy S, St-Vil D, Youssef S, Blanchard H.
    Journal: J Pediatr Surg; 1994 Sep; 29(9):1236-8. PubMed ID: 7807355.
    Abstract:
    Omphalapagus twins constitute less than one third of all siamese twins. Most omphalopagi are attached by a skin bridge that often contains hepatic tissue. Only four cases of omphalopagi attached by an intestinal bridge have been reported. The authors present two additional cases of conjoined twins minimally attached by a small bowel and bladder bridge. In both instances, the spectrum of anomalies included a ruptured omphalocele and imperforate anus with cloacal anomalies. The attachment consisted of an open urachal remnant joining the two bladders, and the short small bowel of twin A attached to the terminal ileum of twin B. Separation was uneventful. For one set of twins, the case part of the proximal colon of twin B was used to lengthen the bowel of twin A. Three of the twins survived and underwent additional procedures for repair of the cloacal anomalies. All four previously reported cases of minimally conjoined omphalopagi presented with a remarkably similar spectrum of anomalies. All had ruptured omphaloceles, imperforate anus with cloacal anomalies, and urachal anomalies. Intestinal connection was consistently at a point corresponding to the Meckel diverticulum site of twin B, with blood supply to the small bowel of twin A, probably via the vitelline artery. The consistent spectrum of anomalies encountered with minimally conjoined omphalopagi allows planning of separation. Caution is required to avoid overlooking the patent urachus, and intestinal lengthening procedures based on the vitelline artery become an important consideration.
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