Fig. 4

Post-mortem ultrasound images of the brain, in coronal section (top row), with matched T2-weighted post-mortem MRI images (bottom row) in a foetus at 25 weeks gestation. The pregnancy was terminated for suspected brain anomalies. Both imaging modalities were performed 2 days after delivery. The images demonstrate views through the frontal lobes (a, d), at the level of the Foramen of Monroe (b, e) and through the posterior horns of the lateral ventricles (c, f). The ultrasound image clearly depicts an interhemispheric cyst (white arrow) with internal septations (c), and there is absence of the corpus callosum. This is also evident from the MRI image (f), although the cyst is much better viewed on ultrasound