dystonic disorder idiopathic torsion dystonia UMLS:C5848258 Torsion dystonia for which no underlying cause has been identified. primary torsion dystonia idiopathic torsion dystonia Idiopathic torsion dystonia GARD:0027976 ICD9:333.6 NCIT:C34564 MONDO:0044811 MEDGEN:1850109 SCTID:22451001 idiopathic disease