NEW YORK — Narcissistic personality disorder crosses the border of healthy confidence into thinking so highly of yourself you put yourself on a pedestal. You may come across as conceited, boastful or pretentious. You may have a sense of entitlement. And when you don’t receive the special treatment to which you feel entitled, you may become very impatient or angry.

Underneath all this behavior often lies a fragile self-esteem. You have trouble handling anything that may be perceived as criticism. You may have a sense of secret shame and humiliation.

When you have narcissistic personality disorder, you may not want to think anything could be wrong — doing so wouldn’t fit with your self-image of power and perfection. You may be generally unhappy and confused by a mix of seemingly contradictory emotions.

Welcome to Isiah Thomas’ world.

If you notice any of these problems in your life, consider reaching out to a trusted health care provider or mental health provider. Getting the right treatment can help make your life more rewarding and enjoyable.

I propose this, not cruelly or to feed the frenzy of an offended coliseum crowd craving the snuffing of a tormented gladiator, but out of concern for an old, occasionally untrustworthy friend clearly in need of help.

What other feasible conclusion can be reached following Thomas’ flurry of far-fetched, contentious contentions over the last few days to a coiled media practiced at exploiting an especially vulnerable headline-making mark when he presents himself?

How else can Thomas’ unfortunate, ill-conceived, disjointed emissions possibly be explained?

Why would Thomas plead his ignoble case before a jury that long ago judged him insufferable and inept when he had (the operative word and tense) compulsive-repulsive New York Knicks owner James Dolan lopsidedly on his side?

Why would Thomas chance estranging the sole person whose belief in him counts for real in terms of ever again being eminently employed by the Knicks?

Why would Thomas — just because he’s no longer cashing Camp Cablevision checks, through no fault of Dolan whose effort to utilize him as a consultant was overruled by David Stern — alert the media he was available for comment regarding touchy topics? Expressly considering Larry Brown’s unwillingness or inability to control his larynx around inquiring minds got him axed and his remaining salary arbitrated down many millions?

Why would Thomas reveal other organizational landfill, such as his unimaginable preference to appoint Bill Laimbeer as coach vs. Next Town Brown, Dolan’s choice? And we thought Jammin’ James didn’t know Bo Diddley about basketball.

Did Brown confess to doing a poor job, as Thomas stressed? Yes. But this is the same person infamous for blaming himself and others in the same sentence without even a comma.

Why would Thomas take “credit” for such a hare-brained inspiration? Why would he submit Brown was guilty for including Trevor Ariza in the Steve Francis trade? How can that be when personnel decisions were his responsibility?

Why would Thomas believe he could persuade LeBron James to come to New York when he couldn’t get so much as an audience with Pope Impious I when dispatched to Cleveland as Dolan’s dubbed emissary?

Why is Thomas fantasizing about replacing Knicks president Donnie Walsh, retired or not, the person who hired him as Pacers’ head coach for $16 million over four years when every other team executive got scared off by stories about his duplicity?

Narcissistic personality disorder!

You know what really reeks about Thomas’ despondent wail for attention is its inappropriate timing apropos to the college he coaches — Florida International had just met the local press the previous day — and the one he coached to three lotteries. After six games, the Knicks (3-3) are neither eliminated nor irrelevant.

Peter Vecsey covers the NBAfor the New York Post.

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