Figure legends:
Figure 1 : Brain CT-scan of the patient. A) Shows a dilatation of the occipital horns of the lateral ventricles at the time of diagnosis, B) Shows the persistence of the dilatation of the occipital horns of the lateral ventricles after three years.
Figure 2: CT-scan of the skull in 3D reconstruction; A) anterior view showing the absence of the upper part of the frontal and the parietal bones, B) posterior view showing the absence of the parietal bone with preservation of the occipital bone. C) and D) progression of the cranial bone development after three years of evolution with a notable reduction of the bone defect.