Atypical behavior Dystonia true ICD10:G24 UMLS:C4020871 An abnormally increased muscular tone that causes fixed abnormal postures. There is a slow, intermittent twisting motion that leads to exaggerated turning and posture of the extremities and trunk. UMLS:C0013421 Dystonic disease Dystonic movements HP:0001332 HP:0002328 Abnormality of movement