Abstract:

INTRODUCTION: Our goal was to create an intracranial translucency (IT) nomogram for the 11-14 weeks of gestation and to evaluate the relationships between IT measurements and gestational days, crown rump length and biparietal diameter METHODS: 119 singleton pregnant women who applied to our clinic in the first trimester were included in the study. The IT of the fetuses were evaluated and the relationship between IT measurements and gestational day, crown rump length (CRL) and biparietal diameter (BPD) was investigated. RESULTS: We determined the average values for gestational day, CRL, BPD and IT as 86.6 ± 4.9 days, 61.6 ± 7.2 mm, 20.7 ± 2.3 mm1.7 ± 0.3 mm, respectively. After that an IT nomogram was formed according to pregnancy days for the 11-14gestational weeks. Linear regression analysis revealed a weak positive correlation between IT and gestational day, CRL and BPD (r= 0.30, r2= 0.0899, r2= 0.0815, respectively).The 50th percentile value of IT was determined as 1.5 mm, 1.7 mm and 1.8 mm for 11 weeks 0-6 days, 12 weeks 0-6 days and 13 weeks 0-6 days, respectively. DISCUSSION AND CONCLUSION: It can be easily measured simultaneously while performing nucal translucency measurements in the first trimester, which can be useful in detecting central nervous system anomalies. The results of our study showed that IT increased linearly with advancing gestational weeks and correlated with gestational days, CRL and BPD, in accordance with the literature. The IT nomogram we obtained can be useful in evaluating our own population.

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