Pooled data for intracranial ventricular dimensions from 23 to 32 weeks' gestational age
| Measurement (mm) | Mean | SD | Normal range |
| Anterior horn width (n = 240) | 1.27 | 0.81 | 0–2.9 |
| Thalamo-occipital distance (n = 239) | 16.7 | 4.0 | 8.7–24.7 |
| Third ventricle width (n = 120) | 1.07 | 0.74 | 0–2.6 |
| Fourth ventricle width (n = 103) | 5.37 | 1.03 | 3.3–7.4 |
| Fourth ventricle length (n = 102) | 4.74 | 1.09 | 2.6–6.9 |
.