Abstract
Background: The cavum septum pellucidum is an important marker for identifying and evaluating the fetal neural axis. Evaluation of the characteristics of the Cavum septum pellucidum is recognized as an important (fetal) factor for fetal ultrasound in the second and third trimesters of pregnancy. Objectives: This study aimed to evaluate the size range of cavum septum pellucidum in the second and third trimesters of pregnancy in women referred to Ali Ibn-e Abitaleb Hospital Clinic of Zahedan. Methods: This was a descriptive-analytical study performed at Ali Ebne Abitaleb Hospital of Zahedan in 2018. Ultrasound examinations were performed on all pregnant women in the second trimester (18 to 20 weeks) and third (36 to 38 weeks). Information such as maternal age, size of septum pellucidum, and gestational age were included in the checklist. Ultimately, the data were entered into SPSS software for statistical analysis. Results: In this study, a total of 500 fetuses were evaluated. The mean age of the mothers under study was 26.36 years old. The mean cavum septum pellucidum size in the second trimester was 3.71 ± 0.81 and 6.11 ± 1.09 mm in the third trimester. The mean size of cavum septum pellucidum in the second trimester of pregnancy was significantly lower than in the third trimester (P < 0.001). Conclusions: The mean size of cavum septum pellucidum in the present study was 4.91 mm, similar to the size of other studies.