Table 2.
Measurement of extra axial space (mm) and brain ventricles (mm) demonstrate progressive enlargement of ventricles over time with minimal progressive change in the extra axial space
| Age (months) | Extra Axial CM SF-L SF-R | Left Lateral Ventricle (T)a | Right Lateral Ventricle (T)a | Third Ventricle (T)a | Forth Ventricle AP T | |||
|---|---|---|---|---|---|---|---|---|
| 0 | 11.9 | 13.7 | 13.9 | 19.8 | 18.8 | 6.7 | 7.3 | 7.9 |
| 13 | 11.6 | 14.0 | 14.9 | 22.7 | 23.5 | 9.4 | 9.4 | 10.7 |
| 50 | 11.6 | 15.0 | 16.4 | 28.6 | 25.4 | 10.6 | 12.0 | 15.6 |
| Age (months) | Extra Axial CM SF-L SF-R | Left Lateral Ventricle | Right Lateral Ventricle | Third Ventricle | Forth Ventricle AP T | |||
| 0 | 8.2 | 15.0 | 14.6 | 13.8 | 7.4 | 4.3 | 5.2 | 8.2 |
| 7 | 7.8 | 17.3 | 13.4 | 15.6 | 7.4 | 7.4 | 6.3 | 12.1 |
| 39 | 9.4 | 17.2 | 16.7 | 15.2 | 9.2 | 8.6 | 7.0 | 15.6 |
a
In a large study of cerebral ventricle size in children (51), the greatest transverse length of the lateral ventricle was 10 mm and the third ventricle was 5 mm.
Abbreviations: CM= Cisterna Magna; SF-L= Left Sylvian Fissure; SF-R= Right Sylvian Fissure; AP= anterior-posterior; T= transverse