Visualization of the Third Ventricle, the Future Cavum Septi Pellucidi, and the Cavum Veli Interpositi at 11+3 to 13+6 Gestational Weeks on 3D Transvaginal Ultrasound Including Normative Data

Abstract

Objectives To show the development of the third ventricle, commissural plate, future cavum septi pellucidi, and cavum veli interpositi in weeks 12–14 by transvaginal 3D ultrasound. Methods This is a prospective transvaginal 3D study carried out to define the third ventricle and the diencephalic midline structures surrounding it. 93 of 387 fetuses in which the commissural plate with the future cavum septi pellucidi, cavum veli interpositi, and the roof of the third ventricle could be well visualized, were selected with the choroid plexus of the third ventricle and the pituitary gland serving as leading structures. In a small number of fetuses, the optic chiasm could also be displayed. In addition, the following measurements were performed: third ventricle craniocaudal and anteroposterior, roof of the third ventricle/cavum veli interpositi, and fcsp. Results The sonomorphologic characteristics of the commissural plate, the future cavum septi pellucidi, and the cavum veli interpositi are described IN 9% OF THE FETUSES examined. Measurements of the third ventricle, cavum veli interpositi, and the roof of the third ventricle show the following results: 3rd V cc = 3.895 + 0.091*CRL mm; 3rd V ap = 4.175 + 0.036*CRL mm; CVI ap = 2.223 + 0.029*CRL mm; CVI cc = 0.139 + 0.02*CRL mm. Conclusion Transvaginal neurosonography enables visualization and measurement of the normal fetal third ventricle at 12–14 weeks of gestation including visualization of the future cavum septi pellucidi and the cavum veli interpositi. BEFORE USE IN PATIENTS CAN BE CONSIDERED, FURTHER SCIENTIFIC WORK IS REQUIRED.

Development of the Prosencephalic Structures, Ganglionic Eminence, Basal Ganglia and Thalamus at 11+3 to 13+6 Gestational Weeks on 3D Transvaginal Ultrasound Including Normative Data

“…Using a transabdominal approach Sari in 2005 published a work describing size and con guration of the third ventricle providing normal values for fetuses from 12 to 40 weeks of gestation, 35 fetuses in GW 12-14 [22]while Loureiro in 2012 published a work on 410 fetuses transvaginally examined presenting normative data of the roof of the third ventricle [14]. Implementing the knowledge of our last publication on the third ventricle and its roof developing from the cavum velum interpositum [23] it was the intention of this work to develop a current normal value of the 3rd ventricle (Fig. 4) measured below CVI transvaginally with high resolution in addition to the already existing normal value of the roof (CVI) by Loureiro.…”