The normal cavum veli interpositi at 14-17 weeks: three-dimensional and Doppler transvaginal neurosonographic study.

This study shows that the mid-line "cyst-like" structure seen during early second trimester, is not an integral component of the brain anatomy, since it is present in only half of normal fetuses in various random sizes. Its distinct location on top of the internal cerebral veins, shows its true origin, a physiologic transient cavum veli interpositi. This article is protected by copyright. All rights reserved.