The Post-Traumatic Stress Disorder is a psychiatric disorder that derives from traumatic events. Although the literature and clinical reports of PTSD is known along centuries, only in 1980 was recognized by the American Psychiatric Association as a diagnostic category of the Diagnostic and Statistical Manual – III. The present article reports the case study of a man with Post-Traumatic Stress Disorder, initial signs of fronto-temporal dementia and other neuropsychological and neuropsychiatric symptomatology. Decurrent of the neuropsychological evaluation was possible to detect a variety of alterations in the humour and personalistic sphere, as well as deficits in orientation, memory, attention, concentration and also in the functions regulated by pre-frontal cortex. This study suggests not only the importance of a deep neuropsychological evaluation, as the necessity to integrate the deficits showed by the patient with the evidence from literature.