Cognitive, somatic and emotional disorders are very common after MTBI and usually disappear within the next few months. However a “miserable minority” keeps complaining more than one year after MTBI. Such patients may persistently seek medical and neuropsychological attention and their complaints are often considered excessive, histrionic and groundless. In this context, 20 adults (5 men, 15 women), mean age 47 years, came to our outpatient clinic, with incapacitating sequelae about 47 months after MTBI. They had comprehensive medical, neuropsychological, psychological (projective tests) and psychiatric assessments (interview and Minnesota Multiphasic Personality Inventory). Here, we present a retrospective study of this group. All patients were socially integrated and did not present any neurological or psychiatric history before the injury. At the time of assessments, 68% of the patients did not go back to work and 47% were still in litigation with their employer or the insurance. The clinical assessment showed various and atypical complaints in cognitive, physical and emotional domains. As patients told their MTBI story, they often used the present tense, active and passive forms of the verbs and mentioned events in a tragic style, with impressive suffering feelings. The neuropsychological and psychiatric assessments brought to light from moderate to severe disorders, particularly speed reduction in 80% of the patients, attentional deficits in 70%, executive dysfunctions with moderate to severe working memory disorders in 100%. Over 95% of the patients presented with persistent post-concussional symptoms, 16% with post-traumatic stress disorder. On the MMPI, 67% of the patients had pathological hypochondriasis scores, 55% had pathological depression scores, 44% had somatic translation of depression. This inventory did not show any simulation: the scale “lie” was never pathological. All patients’ psychic functioning exhibited signs of narcissistic fragility. In most cases, we observed a discrepancy between the gravity of initial injury and the intensity of the complaints. Simulation cannot explain this discrepancy. The respective roles of unending litigation processes, of the traumatizing context of MTBI, of psychic specificities and notably previous experiences of passivity, powerlessness and despair are discussed.