Vaginosonographical determination of the true conjugate and the transverse diameter of the pelvic inlet.

In suspected cases of cephalopelvic disproportion pelvic measurement and the estimation of the fetal weight can be essential for the management of labor. We measured the true conjugata and the widest transverse diameter of the pelvic inlet with a new vaginal scanner. The biparietal diameter (BPD) was measured with a real-time sector scanner. The results of vaginosonographical measurement were compared and showed good correlation with both conventional radiological measurement and measurements obtained by a compound scanner. Vaginosonographical measurement which causes no pain, is quick and also allows measurement of the transverse diameter of the pelvis, might become a routine method in all suspected cases of cephalopelvic disproportion.