Marjorie Wallace, chief executive of the mental health charity SANE, said: "Although narcissistic personality disorder is not that rare, it is seldom that it becomes a pathological disorder that could lead to this kind of brutal act.
Narcissistic personality disorder is not classified as a specific personality disorder by the World Health Organization's ICD-10. The ICD-10 classification includes narcissistic personality traits under the classification of Histrionic Personality Disorder. Thus, the IC-10 classification of Histrionic Personality Disorder includes the narcissistic personality traits of: egocentricity, self-indulgence, continuous longing for appreciation, lack of consideration for others, feelings that are easily hurt, and persistent manipulative behaviour. The following diagnostic criteria for Narcissistic Personality Disorder is not in the ICD-10, but was created (by this editor) by splitting off the narcissistic personality traits that are included in the ICD-10 classification of Histrionic Personality Disorder.
Narcissistic Personality Disorder Resources
Wikipedia states: “Narcissistic personality disorder (NPD) is a personality disorder in which the individual is described as being excessively preoccupied with issues of personal adequacy, power, prestige and vanity. This condition affects one percent of the population. First formulated in 1968, it was historically called megalomania, and it is closely linked to egocentrism.”