It seems to me that this disorder is related to other delusion disorders. Delusions are defenses, and seem not so far removed from OCD rituals. I think Ts generally accept delusions at face value and their relative truth/falseness and work with them until the client is able to give them up. It can probably be a long process at times requiring a great deal of patience. Countering a defense or trying to force a client to abandon it usually just entrenches it. It isn't lying, and while immensely frustrating, the underlying pain they hide is just as worthy of treatment as any other condition.
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