Increased first-trimester nuchal translucency associated with thanatophoric dysplasia type 1

Abstract

Thanatophoric dysplasia (TD) is the most frequent form of lethal skeletal dysplasia. Prenatal diagnosis is commonly accomplished in the second-trimester scan, but occasionally TD is found to be associated with increased nuchal translucency (NT) at first-trimester screening for aneuploidies. TD may not be clearly distinguished from the other skeletal dysplasias. A definite diagnosis can be established by molecular genetic analysis to find out the abnormal mutations in the fibroblast growth factor receptor 3 (FGFR3) gene. We reported a case of TD type 1 detected by first-trimester NT measurement, and confirmed by molecular analysis of FGFR3 gene using high-resolution melting analysis.

Keywords::

• Thanatophoric dysplasia type 1
• nuchal translucency
• fibroblast growth factor receptor 3 (FGFR3) gene
• prenatal diagnosis
• high-resolution melting analysis

Declaration of interest: The authors report no declarations of interest.