Charles Bonnet syndrome in temporal arteritis.

An 87-year-old woman presented with Charles Bonnet syndrome--the occurrence of formed visual hallucinations in sane aged individuals. This was followed by headaches and unilateral visual loss, and the diagnosis of temporal arteritis (TA) was confirmed by biopsy. Steroid therapy resulted in disappearance of hallucinations, which recurred 7 mo later, responding to an increase in steroid dosage. Charles Bonnet syndrome may be an early sign of decreasing visual acuity in aged individuals; thus, diagnosis of TA or exacerbation of established TA should be considered in such patients.