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Wendy Williams ' lawyer is challenging the alleged test results that reportedly prove she has dementia and aphasia ... insisting those spreading the claim are acting out of self-interest.

Joe Tacopina tells TMZ ... Wendy's leaked medical diagnosis is "false" -- and, it's "being spread by a party with a vested interest in keeping Wendy trapped under this excessive and restrictive guardianship." Gallery Launch Gallery Getty

He adds the leaking of the alleged diagnosis is a total violation of Wendy's rights as a human being.

Tacopina ends his statement saying, "The critical questions are these: Where is the actual medical report supporting this leak? And who is the doctor willing to go under oath and face cross-examination by me so the truth can be exposed?" Play video c

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