Narcissistic personality disorder (NPD) is a Cluster B personality disorder[1] in which a person is excessively preoccupied with personal adequacy, power, prestige and vanity, mentally unable to see the destructive damage they are causing to themselves and to others in the process. It is estimated that this condition affects one percent of the population, with rates greater for men.[2][3] First formulated in 1968, NPD was historically called megalomania, and is a form of severe egocentrism.[4]