Fig. 3

Right lambdoid synostosis: a, b, c: 3D CT reconstructions showing the closure of the right lambdoid suture (a), right mastoid prominence and bilateral occipital suboccipital “beaten copper” appearance of the skull (a, b), and anterior rotation of the right condyle (c). d, e: sagittal T1 MR view at the level of the cerebellar tonsils showing unilateral (right = d) protrusion of the cerebellar tonsil through the foramen magnum, the left cerebellar tonsil appearing in normal position (left = e). f: angio MR (from a frontal view) showing a stenosis of the right transverse and sigmoid sinus and of the sigmoido-jugular junction. g: surgical view showing the flattening of the right occipital suboccipital region and the right occipitomastoid prominence; h: surgical view after craniotomy and bone removal showing the stenosis of the right transverse and sigmoid sinus. i: Surgical view at the end of bone remodeling with “barrel-stave” cuts and bone repositioning