[Visual hallucinations and giant cell arteritis: the Charles Bonnet syndrome]

In patients with visual hallucinations, diagnostic strategy is unclearly codified. In patients known to have giant cell arteritis, the main diagnostic assumption is disease relapse. Indeed, this should lead to rapid corticosteroid therapy. However, the Charles Bonnet syndrome, that is a poorly known etiology of visual hallucinations usually observed in elderly people, should be part of the differential diagnosis. We report a 87-year-old woman, with a 2-year history of giant cell arteritis who was admitted with an acute onset of visual hallucinations and who met all the criteria for Charles Bonnet syndrome.