THIRD VENTRICLE

 

  • Well visualized in the first and early second trimesters.
  • As gestation progresses it becomes filled with the choroid plexus (tela choroidea) of the third ventricle and is considered a virtual space.
  • The two thalami touch each other at the point of the massa intermedia.
  • Width of 3rd Ventricle (1)
    • 2.5mm at a BPD of 2.3cm
    • 8.2 mm by term.

 

 

 

 

REFERENCES
  1. Denkhaus H, Winsberg F. Ultrasonic measurements of the fetal ventricular system. Radiology 1979;131:781-787.