Groves described four types of such undesirable patients: "dependent clingers" (codependents), "entitled demanders" (narcissists and borderlines), "manipulative help rejectors" (typically psychopaths and paranoids, borderlines and negativistic passive-aggressives), and "self-destructive deniers" (schizoids and schizotypals, for instance, or histrionics and borderlines).

The narcissist sends a message to his psychotherapist: there is nothing you can teach me, I am as intelligent as you are, you are not superior to me, actually, we should both collaborate as equals in this unfortunate state of things in which we, inadvertently, find ourselves involved.

Children and adolescents with conduct disorder are budding psychopaths.

The DSM is clear: the brain-injured may acquire traits and behaviors typical of certain personality disorders but head trauma never results in a full-fledged personality disorder.

The DSM-IV dropped two diagnoses that made an appearance in the DSM-III: the masochistic and the sadistic personality disorders. But these are not the only differences between the two editions as far as Axis II (personality disorders) goes.