[Capgras' syndrome with right frontal meningioma]

We present a 43-year-old woman with a right frontal parasagittal meningioma of the brain who developed the delusion that her husband and children had been replaced by doubles (look-alikes). This type of delusion is typical for Capgras' syndrome. After removal of the tumor the delusion disappeared. The majority of such patients are diagnosed as paranoid schizophrenia. However, in the past decade there has been an increasing number of cases in which the etiology is suspected of being organic, involving mainly the right hemisphere. The case presented is unique because it is the first with meningioma as a possible pathogenic factor in the syndrome, as evidenced by the cessation of the delusion when the tumor was removed.