Purpose: The purpose of this study was to measure the maximal width, middle width, and length of the cavum septi pellucidi (CSP) in normal fetuses, and compare these measurements obtained in the transthalamic (TT) plane with those obtained in the transventricular (TV) plane.
Method: A prospective study was conducted of normal singleton fetuses, ranging from 18 to 36 weeks in gestational age. In each case, a three-dimensional volume of the fetal head was obtained in the TT plane for further offline measurements, then the maximal width, middle width, and length of the CSP in both the TT and TV planes were measured. Intraobserver and interobserver reproducibility was assessed, and curve estimation was used to assess the possible relationship between these measurements of CSP and gestational age (GA).
Results: A total of 267 normal fetuses were studied. The CSP width and length in TT and TV planes as a function of GA were analyzed using a quadratic regression model. Intraobserver and interobserver agreement of the CSP measurements was excellent overall (ICCs >0.9), with intraobserver and interobserver differences of less than 4%.
Conclusion: Measurements of CSP in the TT and TV planes are equally reproducible.
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