Neonatal Brain

Sonographic Normal Cerebral Ventricle Measurements by Age

Age Frontal Horn (mm) Body (mm) Third Ventricle (mm)
Premature infant < 10*
Term infant 10-11*
Newborn ≤ 3 < 4


*Body - Measured in a transaxial view from its lateral edge to the midline. (This is not truly the width of the lateral ventricle but the distance from the superolateral ventricular wall to the falx).


  1. Goldberg BB, Kurtz AB.  Atlas of Ultrasound Measurements.  Mosby Year Book: Chicago.  1990.  pp. 20-22.


Visualization of the Paranasal Sinuses*

Maxillary - 2 to 3 months
Ethmoidal - 3 to 6 months
Sphenoidal - 1 to 2 years
Frontal - 8 to 10 years

* The radiographic visualization of the sinuses lags the actual gross appearance based on autopsy.


  1. Kirks DR. Griscom NT.  Practical Pediatric Imaging.  Lippincott - Raven: Philadelphia.  1998.