1 Unit of Rare Diseases of the Nervous System in Childhood, Department of Clinical and Experimental Medicine, Section of Pediatrics and Child Neuropsychiatry, University of Catania, 95124 Catania, Italy. Electronic address: m.ruggieri@unict.it.
2 Unit of Rare Diseases of the Nervous System in Childhood, Department of Clinical and Experimental Medicine, Section of Pediatrics and Child Neuropsychiatry, University of Catania, 95124 Catania, Italy.
3 Radiology I Unit, Department of Medical and Surgical Sciences and Advanced Technologies, University of Catania, Catania, Italy.
4 National Centre for Rare Diseases, Istituto Superiore di Sanità, Rome, Italy.