LAUSR

OBJECTIVES Following the presence of both post-traumatic stress disorder (PTSD) and post-concussion syndrome (PCS) in the nosography since the publication of DSM-IV, large-scale studies investigated the links between these two entities: exposure to a mild traumatic brain injury was correlated with the presence of PTSD and vice versa, and the strongest factor associated with PCS was the presence of PTSD. But PCS entity was recently suppressed from the 5th edition of the American diagnostic and statistical classification of neuropsychiatric disorders (DSM-5, 2013). In the 11th edition of the CIM, PCS is also likely to be omitted. This elimination raises more questions if we take into consideration the emancipation of PTSD, which now includes the full category of "disorders related to trauma and stressors" to which PCS could have legitimately been added. METHODS We discuss current scientific literature and clinical practices with a socio-anthropological point of view. RESULTS Post-concussion and post-traumatic clinical entities often show similar anamnestic temporalities, with an initial acute phase where memory (amnesia following TBI; dissociative post-traumatic amnesia) and consciousness (initial loss of consciousness secondary to TBI; peri-traumatic psychic dissociation) impairments predominate, followed by a pauci-symptomatic latency phase. Finally, a symptomatic phase occurs in which similar symptoms for both entities are observed (sleep disorders, anxiety and depression, irritability, fatigue, attention disorder, tendency to avoidance). If similar therapies (pharmacological and psychological) are effective in treating the clinical consequences of head and mental trauma, this suggests that they have common etiopathogenic origins. CONCLUSIONS Yet, post-concussion syndrome remains a clinical-biological reality. If a diffusion tensor imaging MRI in the acute phase is likely to provide predictive elements for subsequent cognitive dysfunctions, it would appear useful to consider combining biomarkers, and linguistics markers, with the creation of a clinical-radio-bio- neuropsychological score in order to differentiate benign outcomes from neuro- and/or psycho-traumatic disorders.