Background: Sonographic measurement of foetal biparietal diameter is a
well-accepted predictor of gestational age. However, there is a high variability
in the calculated gestational age which increases as pregnancy progresses with a
maximum difference approximating 3.6 weeks in the third trimester. Conditions
like oligohydramnios can alter the shape of the foetal skull, affect the BPD and
increase variability. The present study is being undertaken to measure the
transverse cerebellar diameter (TCD) to validate it as an additional
morphological measurement of foetal growth with less variability.
The cerebellum and posterior fossa are aligned perpendicular to the plane of
maximum extrinsic compression. Hence they can withstand deformation by
extrinsic pressure than the parietal bones and can be a more accurate parameter
for determining gestational age.
Methods: A cross-sectional study was done in 100 healthy women with
uncomplicated pregnancy between the 28th week of gestation and 40th week of
gestation over three years in outpatient and in-patient sections of Obstetrics and
Gynaecology Department of SRM Hospital and Research Institute,
Kattankulathur, Chennai. This study was undertaken to determine a correlation
between the transverse cerebellar diameter and the gestational age as
determined by the last menstrual period and other sonographic parameters like
biparietal diameter and femur length. After satisfying the inclusion and
exclusion criteria, Transabdominal ultrasonography was performed with the
patient in a supine position. The Pearson Correlation technique was used to test
the direction and strength of the relationship between gestational age obtained
using transverse cerebellar diameter vs individual parameters such as biparietal
diameter and femoral length.
Results: A scatter diagram showing the correlation and regression analysis of
the Gestational age with BPD in the third trimester. Here TCD is correlated with
BPDby87.1 %. A scatter diagram showing the correlation and regression
analysis of the TCD with FL in the third trimester. Here TCD is correlated with
FL by 93.0 %
Conclusion: Obstetric sonography was performed in 100 pregnant women with
uncomplicated pregnancy with known LMP, previous history of normal
menstrual cycle, and no exclusion criteria were included in the study. Foetal
biometry evaluated includes BPD, FL, and TCD. The nomogram of the TCD
shows that there is a linear relationship between cerebellar growth and
gestational age. So TCD can be used as a reliable parameter for determining
gestational age

 Accuracy of transcerebellar diameter in estimation of gestational age in third trimester and its comparison with conventional parameters such as biparietal diameter and femur length

 Obstetrics and Gynecology

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Accuracy of transcerebellar diameter in estimation of gestational age in third trimester and its comparison with conventional parameters such as biparietal diameter and femur length

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