Róbert Dankovčík, Andrea Grešová, Stela Muránska, František Grochal, Eva Čečková, Peter Urdzík
One of the shortcomings of ultrasound in the first trimester is the inability to consistently diagnose open neural tube defects. Recently a new ultrasound marker called intracranial translucency was published. It is an intracranial marker whose anatomical substrate is the fourth brain ventricle. In open neural tube defects subarachnoid pressure is declining and there appears caudal brain shift. In open neural tube defects intracranial translucency is not present.