Comparison of Transcerebellar Diameter with Biparietal Diameter on Ultrasound for Gestational Age Measurement in Third Trimester of Pregnancy Using First Day of Last Menstrual Period for Actual Period of Gestation

Saira Noreen; Muhammad Usman Khan; Nisar Ahmed; Atiq ur Rehman Salehria; Muhammad Zeeshan Ali; Muhammad Rizwan Bashir Kiani

doi:10.51253/pafmj.v73iSUPPL-1.9604

Authors

Saira Noreen Department of Radiology, Armed Forces Institute of Radiology & Imaging/National University of Medical Sciences (NUMS) Rawalpindi Pakistan
Muhammad Usman Khan Department of Radiology, Combined Military Hospital, Quetta/National University of Medical Sciences (NUMS) Pakistan
Nisar Ahmed Department of Radiology, Armed Forces Institute of Radiology & Imaging/National University of Medical Sciences (NUMS) Rawalpindi Pakistan
Atiq ur Rehman Salehria Department of Radiology, Armed Forces Institute of Radiology & Imaging/National University of Medical Sciences (NUMS) Rawalpindi Pakistan
Muhammad Zeeshan Ali Department of Radiology, Armed Forces Institute of Radiology & Imaging/National University of Medical Sciences (NUMS) Rawalpindi Pakistan
Muhammad Rizwan Bashir Kiani Department of Anatomy, Army Medical College/National University of Medical Sciences (NUMS) Rawalpindi Pakistan

DOI:

https://doi.org/10.51253/pafmj.v73iSUPPL-1.9604

Keywords:

BDP, Gestational age, Pregnancy, TCD

Abstract

Objective: to evaluate how well biparietal diameter and transcerebellar diameter performed in estimating the gestational age of pregnant women in their third trimester.

Study Design: Cross-sectional study.

Place and Duration of Study: Armed Forces Institute of radiology and Imaging, Rawalpindi Pakistan, Feb to Aug 2022.

Methodology: There were 120 pregnant women who went to the Obstetrics and Gynecology Departmental walk-in clinic or Emergency room between weeks 28 and 40 of their pregnancies. Ultrasound was done on all patients that had been
preselected after a complete history and physical examination had been completed; transcerebellar diameter (TCD) and
biparietal diameter (BPD) were measured and compared with LMP.

Results: Mean age of the participants recruited in the study was 27.08±1.45 years. There was a significant increase in mean
BPD from 28 weeks of gestation (68.01±7.4 mm) to 36 weeks of gestation (89.77±2.35 mm). During 28 weeks of gestation, the mean TCD was 30.3±1.49 mm, whereas at 36 weeks it peaked at 48.1±1.21 mm. By looking at the median gap between real and estimated GA by BPD, we find that when real GA rises, the magnitude of the age estimation error decreases significantly. The error was 3.22±0.17 days for GA at 28 weeks, 2.48±0.09 days at 34 weeks, and 2.18±0.01 days at 36 weeks. A statistically significant (p<0.001) shift in the mean error was observed. ..........

Conclusion: Both TCD and BPD were shown to be helpful in this study's context, however statistically speaking, TCD was
superior to BPD. ...........