Novel finding of paroxysmal tonic downgaze in Loeys-Dietz syndrome: expanding neurological phenotype - Falsaperla, Raffaele; Sortino, Vincenzo; Moliteo, Evelina; Saporito, Marco Andrea Nicola; Cimino, Carla; Cacciaguerra, Giovanni; Pavone, Piero (AIMS medical science, 2025)