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FIG 1. Case 1.
A and B, CT scans obtained at 20 days of life show an enlargement of the right lateral ventricle, mainly at the occipital horn, and of the right sylvian fissure, with incomplete opercularization of the insula (A), and a large right middle cranial fossa arachnoid cyst and a cerebellopontine angle lipoma on the same side (arrowhead, B).
C and D, MR images obtained at 19 months of age. Axial T2-weighted image (3000/120/1 [TR/TE/excitations]) (C) confirms the enlargement of the right lateral ventricle and the abnormal opercularization of the insula; the right hemispheric cortex appears thick, with few and irregular sulci. Coronal T1-weighted image (510/15/2) (D) shows the right pontocerebellar angle lipoma and the temporal arachnoid cyst; a subtle hemispheric subdural collection, without mass effect, is appreciable on the right.
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