Epidemiology and management of neuropsychiatric disorders in Behçet's syndrome.

Behçet's syndrome (BS) is a systemic, chronic, relapsing vasculitis, typically characterized by recurrent orogenital ulcers, ocular inflammation and skin manifestations; articular, vascular, gastroenteric and neurological involvement may also occur. Besides the other clinical features of BS, it seems relatively frequent that patients with BS develop a neurobehavioural syndrome, characterized by euphoria, bipolar disorders and paranoid attitudes, loss of insight/disinhibition, and indifference to their disease, defined as 'neuro-psycho-BS'. To date, the pathogenetic mechanism underlying neuro-psycho-BS has not been determined. It may be secondary to organic neurological involvement, or it may be related to poor quality of life and the relapsing course of the disease. Another engaging theory suggests that it could be related to the frequent observation of psychiatric symptoms during relapses or, in some cases, in the phases preceding reactivation of the disease; these elements suggest that psychiatric disorders in BS could represent a crucial element, whether a psychiatric subset or a distinct clinical feature of the disease. Moreover, it has been reported that cognitive impairment in BS can be seen with or without central nervous system involvement. Globally, psychiatric symptoms have been described as being multifaceted, ranging from anxiety disorders to depressive-bipolar disorders or to psychotic ones. In addition, some psychological characteristics of BS patients seem to predispose them to maladaptive stress management, which may lead to stress-related disorders, including anxiety and depression. Therefore, the aims of this review are to explore the epidemiology of neuro-psycho-BS by evaluating the relationship between the stress system and the multifaceted psychiatric manifestations in BS, and to summarize the therapeutic strategy used.