Organic disorders can mimic all kinds of psychiatric illnesses. Some neurological diseases including front location are misleading when psychiatric manifestations represent the beginning shape or dominate the clinical. It may be dementia, mental confusion, mood disorders and psychotic disorders.

the aim of this study was to point out through the study of a clinic observation, discuss the importance of the importance of organicity to psychiatric disorders and the resulting difficulties of diagnostic and therapeutic order.

We report the case of a 72 year old man without chronic disease identified, consulted in February 2013 emergency following a head injury with loss of initial knowledge . The brain scanner (TDM) was normal. In July 2013, the patient began to exhibit behavioral problems in such wandering, memory problems, slow ideation, delusions of persecution with audiovisual hallucinations. This table psychotic moved in a very insidious and fluctuating intensity. The patient was seen in psychiatry at the worsening of symptoms. Exploration has confirmed the diagnosis of chronic subdural hematoma (HSDC) without signs of compression. The surgery consisted of an enlarged trepanation and evolution was favorable.

It appears from this case and review of the literature that various psychiatric manifestations may reveal an HSDC and that, in the elderly, neuroimaging should be systematic, even for minor symptoms. The total resorption led to the disappearance of psychiatric symptoms in most patients, but this remains a topic of discussion for patients who retain residual symptoms, even after resorption of the mass.