BackgroundBackground: Tics describe a wide range of sudden and repetitive behaviors. Their multifaceted clinical features may resemble other explosive behaviors, including repetitive episodes of aggression toward others (allo-aggression) reported by subjects without tics. Here, we document 3 exemplary cases that help disentangle allo-aggressive behaviors from tics. Cases Cases: We report 3 cases who presented with an array of complex repetitive behaviors, most notably alloaggression (eg, sudden kicking, hitting, slapping and biting others, or pushing someone off a bike), which were misdiagnosed as primary tics. In all cases, additional symptoms, such as blackouts, feeling of being controlled by different personalities, or being empowered by repetitive behaviors, and examination pointed toward different neuropsychiatric diagnoses. Conclusions Conclusions: Repetitive allo-aggressive behaviors are not part of the range of motor manifestations of tics. This observation not only has important medico-legal implications but is also relevant for the overall perception of Tourette syndrome and other primary tic disorders.Among the range of hyperkinetic movement disorders, tics have the widest phenomenological variability and most closely resemble voluntary actions. Any type of brief and sudden movement or sound can also be a tic, and it may often be very difficult to distinguish between tics and other explosive repetitive phenomena, including more complex behaviors. 1 This issue has important clinical implications because correct phenomenological labelling and etiological classification will determine appropriate treatment selection.Most recently, we came across 3 patients who presented with sudden and repetitive episodes of aggression toward others (alloaggressive behaviors), such as throwing objects and biting or kicking others, which were initially misdiagnosed as primary tics. Clinical history and examination subsequently pointed toward different neuropsychiatric diagnoses. Given the medico-legal importance of this issue and the implications it carries both for diagnosis and the overall perception of tic disorders, including media depictions, we describe the characteristics of these cases and discuss the phenomenon of allo-aggression in the context of tics.
Case Series Case 1Case 1 is an adolescent female, who, a few months before current presentation, had suddenly (overnight) developed repetitive behaviors, including head and whole-body thrusting, arm flailing, repetitive vocalizations, coprophenomena (eg, showing the middle finger while shouting different obscene words), and allo-aggression. She would abruptly and repetitively kick, hit or slap others, often specific people. She reported having no control over these behaviors, which she needed to let out, often as the result of a mounting inner tension. She reported that her behaviors were often determined by other personalities taking control