A study of Correlation of Transverse Cerebellar Diameter with Gestational Age in the Normal & Growth Restricted Fetuses in Western Uttar Pradesh

Abstract

Transverse Cerebellar Diameter (TCD) is a more accurate &amp; better predictor of gestational age in normal as well<br> as in IUGR fetuses. In intra uterine growth restricted (IUGR) Fetuses, the transverse cerebellar diameter does not get<br> affected due to insufficiency of fetal circulation and so can be used as an unbiased measurement of gestational age (GA).<br> It withstands deformation by external pressure because Cerebellum is the largest part of hind brain which lies in the<br> posterior cranial fossa, surrounded by the dense petrous ridges and the occipital bone. The cerebellum is easily visualized<br> sonographically. The aim of this study was to establish ‘Correlation between TCD &amp; GA in Normal &amp; IUGR fetuses’.<br> The study group comprised of 650 cases. Women having pregnancy between 14 to 40 weeks were considered for<br> Ultrasound Examination. Patients who had any complication of pregnancy were not included in the study. During 14 to 26<br> weeks of gestation- transverse cerebellar diameter in mm was found equivalent to gestation age of fetus. The Karl Pearson<br> correlation coefficient between gestational age &amp; transverse cerebellar diameter was found to be 0.972305. p-value is &lt;<br> 0.001 which was highly significant. In IUGR Fetuses, the value of measurement of Transverse Cerebellar Diameter was less<br> than the normally grown fetuses. The mean difference was 1.065 from the expected mean for normally grown fetuses. p-<br> value was p&lt; 0.01 i.e. statistically significant. In the normal &amp; IUGR Fetuses the Transverse Cerebellar Diameter increases<br> with advancing age. Linear relationship of TCD is observed with GA. This study shows highly significant correlation<br> between Transverse Cerebellar Diameter &amp; Gestation age in normal &amp; IUGR fetuses.