Human Reproduction, Vol. 14, No. 3, 823-826,
March 1999
© 1999 European Society of Human Reproduction and Embryology
Lymphatic vessel hypoplasia in fetuses with Turner syndrome
1 Harris Birthright Research Centre For Fetal Medicine, King's College School of Medicine and Dentistry, Denmark Hill, London, UK, 2 Institute of Anatomy II, University of Freiburg, Albertstrasse 17, D-79104 Freiburg and 3 Department of Obstetrics and Gynaecology, University of Kiel, Kiel, Germany
Turner syndrome is associated with subcutaneous accumulation of fluid in the neck region that can be visualized sonographically from 10–14 weeks of gestation as massively increased nuchal translucency thickness. Possible mechanisms for this increased translucency include dilatation of the jugular lymphatic sacs because of developmental delay in the connection with the venous system, or a primary abnormal dilatation or proliferation of the lymphatic channels interfering with a normal flow between the lymphatic and venous systems. The aim of this study was to investigate the distribution of lymphatic vessels in nuchal skin tissue from fetuses with Turner syndrome compared with fetuses carrying trisomies 21, 18 and 13 and chromosomally normal controls. The distribution of vessels was examined by immunohistochemistry using a monoclonal antibody, PTN63, against 5'nucleotidase and an anti-laminin antibody. In normal control fetuses (n = 6) and those with trisomies 21 (n = 3), 18 (n = 2) and 13 (n = 2), PTN63-positive and laminin-positive vessels were evenly distributed throughout the dermis and subcutis. In Turner syndrome (n = 3), there was a chain of large vessels that stained with both PTN63 and laminin at the border between dermis and subcutis, but there was scarcity of vessels in the upper dermis and the subcutis. Using PTN63 alone, there were no positive vessels in the upper dermis. We conclude that in Turner syndrome lymphatic vessels in the upper dermis are hypoplastic.
Key words: lymphatic vessels/nuchal translucency/5'nucleotidase/trisomies 21, 18 and 13/Turner syndrome
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