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CORRELATION BETWEEN TRANSVERSE CEREBELLAR DIAMETER AND FEMUR LENGTH IN THIRD TRIMESTER OF PREGNANCY

Dr. Hira Bushra, Dr. Faiza Waseem, Dr. Rafia Irum , Dr. Muhammad Usman Bashir

Objective: The objective of this study was to determine the correlation between transverse cerebellar diameter (TCD) and femur length (FL) in third trimester of pregnancy. Material and methods: This cross-sectional study was conducted at Department of Diagnostic and Interventional Radiology, Chaudry Pervaiz Elahi Institute of Cardiology Multan from May 2018 to November, 2018 over the period of 6 months. Total 100 pregnant women between 26-38 weeks of pregnancy, who sure of dates calculated by first day of last normal menstrual period coming for obstetrical USG to the radiology department of SGRH were selected for this study. The patient was placed in supine position. The transducer was placed on the skin surface after applying the coupling agent. In each patient, femur length (FL) and transverse cerebellar diameter (TCD) were measured and correlation between FL and TCD was assessed. Results: A strong positive correlation (r value = 0.966, p value = 0.000) was found between TCD and FL in the third trimester of pregnancy. Similarly, a strong correlation was also observed between TCD and gestational age (GA) (r=0.982, p value: 0.000) and between FL and GA (r=0.970, p value: 0.000). Out of 100 patients, TCD was found to give correct assessment corresponding to the gestational age by LMP in 91% patients, while in 84% patients FL was found to give correct assessment corresponding to the gestational age by LMP. Conclusions: There is strong correlation between transcerebellar diameter (TCD) and femur length (FL) in normal pregnancies in the third trimester of pregnancy between 26-38 weeks of gestation and correlation of transcerebellar diameter with gestational age is stronger than correlation of femur length with gestational age in the third trimester of pregnancy. Key words: Transcerebellar diameter, Gestational age, Femur length, Third trimester of pregnancy.