Chronic Narcissistic Personality Disorder.
Rarely curable and sometimes fatal.
The use of the term "narcissism" to describe excessive vanity and self-centredness predates by many years the modern medical classification of narcissistic personality disorder. The condition was named after a mythological Greek youth named Narcissus who became infatuated with his own reflection in a lake. He eventually died there because he couldn't tear himself away from the admiration of his image.