Is narcissism curable?

Based on what I know, here's my take on it.

There are times when narcissism is part of another condition, such as sociopathy. The brain of a sociopath is actually different than others. Scans have actually shown that they often lack the ability to see moral dilemmas. For example, you or I might get bumped by someone in a crowd and hesitate about how to react or we might have the flicker of a moment where we decide whether to lie or cheat in a game. They don't have that. And, without the person actually having the ability to be socially/ morally aware/ have empathy, they can't really be treated. There's no cure for the underlying condition. 

That said, narcissistic personality disorder, by itself with no other conditions influencing it, can be treated, but it somewhat depends on the roots. Most professionals believe there is a genetic undercore which is activated either by indulgent or neglectful parenting. ie The neglected child will learn to do anything he or she can to get attention. The indulged child will learn he or she is above all others. I would venture to guess it's easier to get through to the adult that was once a neglected child by working on learning empathy and demonstrating that there's a link between your actions and the outcomes. The neglected child can work through the childhood trauma as well. Eventually, these things will help him or her shed the narcissistic tendencies. I suspect the indulged child would be much harder to get through to. Whereas the other has a sense of entitlement stemming from "I work harder, I've overcome more, I've dealt with more," the entitled child has not had to grow or overcome adversity. And, in that sense, it may well be easier for the entitled child to protect him or herself by sticking to this alternate reality in which everyone else is an idiot. That's a very difficult reality to let go of. It totally shatters your sense of self. In either case, both can be treated, but the therapist has to understand how the person became a narcissist and address treatment in a way that's appropriate for the causes. And, as others have pointed out, narcissists don't often see anything wrong with themselves, so few enter into treatment anyway unless they're going in for depression or anxiety treatment.