benign paroxysmal tonic upgaze of childhood with ataxia true Benign paroxysmal tonic upgaze presents in early infancy and is characterised by prolonged or intermittent upgaze which may last hours or days. Children may be ataxic during episodes and attacks occur more frequently during intercurrent illnesses. OMIM:168885 MONDO:0008206 Benign paroxysmal tonic upgaze of childhood with ataxia is a rare paroxysmal movement disorder characterized by episodes of sustained, conjugate, upward deviation of the eyes and down beating saccades in attempted downgaze (with preserved horizontal eye movements) which is accompanied by ataxic symptomatology (unsteady gait, lack of balance and movement coordination disturbances) in an otherwise healthy individual. Bilateral vertical nystagmus is associated. Symptoms generally disappear spontaneously within 1-2 years after onset. ICD10:G96.8 UMLS:C1868576 paroxysmal tonic upgaze, benign childhood, with ataxia Ouvrier Billson syndrome Orphanet:1179 SCTID:763127004 MESH:C566817 benign paroxysmal tonic upgaze GARD:0004176 Ouvrier-Billson syndrome rare paroxysmal movement disorder