If you have Wrist Tendonitis you may/may not have Carpal Tunnel Syndrome. They aren't the same thing. Tendonitis of the wrist tendons is reversable and fixable.
Dequervains Tendonitis is a fancy term for Tendonitis of the Thumb. It is NOT a disease. Dequervains tenosynovitis is very related. Ok, it's the same thing.