Fetal Transcerebellar Diameter Measurement for Prediction of Gestational Age at the Third Trimester

Document Type : Original Article

Authors

Obstetrics and Gynecology, Faculty of Medicine for boys, Al-Azhar University, Cairo, Egypt

10.21608/aimj.2025.446512

Abstract

Background: The trans-cerebellar diameter (TCD) refers to the largest horizontal measurement of the fetal cerebellum. The fetal cerebellar hemispheres are situated in the posterior cerebral fossa, which exhibits resistance to external pressure & growth irregularities.
Aim and objectives: To evaluate if the TCD can serve as reliable predictor of  GA in fetuses in 3rd  trimester.
Patients and methods: This prospective cross section research was carried out on 100 pregnant women with: maternal age among 25 and 35 years old, singleton pregnancy and at third trimester from the obstetrics & gynecology department of Al-Azhar University Al-Hussein and Sayed-Galal hospital. It lasted for one year.
Results: Sensitivity of TCD use was 95% and specificity was 85%. Mean age was 27.52 ± 2.84. Mean BMI was 26.47±4.6. Mean parity was 1.18 ± 0.58. Mean gravidity was 2.65 ± 1.58. Mean GA-LMP was 31.24±1.66. Mean GA-TCD was 31.21±1.72. Mean GA-FL was 30.53±1.7. Mean GA-AC was 30.65±1.72. Mean GA-HC was 30.58±1.74. Mean GA-BPD was 30.53±1.72. There was a significant relationship between GA by the last menstrual period (LMP) & gestational age measured by fetal diameters. P-value was <0.00.
Conclusion: The trans-cerebellar diameter is a dependable and singular sonographic foetal biometric measurement that can be used to accurately determine the GA during the 3rd trimester of pregnancy.

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