Vascular anastomoses in dichorionic diamniotic-fused placentas.

Department of Anatomic Pathology, University of Bologna, Bologna, Italy.
International Journal of Gynecological Pathology (Impact Factor: 1.41). 11/2003; 22(4):359-61. DOI: 10.1097/01.PGP.0000070848.25718.3A
Source: PubMed

ABSTRACT A case of fetal twin-to-twin cytomegalovirus infection through a dichorionic diamniotic (DiDi)-fused placenta prompted our search for possible vascular anastomoses in this type of placenta. This case and three additional DiDi-fused placentas were studied with gross (macro) sections and a three-dimensional (3D) stereomicroscopic technique. Two twins were dizygotic (they differed in gender and blood groups) and the other two were probably monozygotic. Macrosections and 3D-image analysis demonstrated side-to-side connections between small subchorionic vessels. These findings demonstrate that vascular anastomoses are present in DiDi-fused placentas.