The mucous sheaths of the tendons on the back of the wrist.<unk>  involves noninflammatory thickening of the tendons and the synovial sheaths that the tendons run through. The two tendons concerned are those of the extensor pollicis brevis and abductor pollicis longus muscles. These two muscles run side by side and function to bring the thumb away from the hand; the extensor pollicis brevis brings the thumb outwards radially, and the abductor pollicis longus brings the thumb forward away from the palm.<unk><unk>  tendinopathy affects the tendons of these muscles as they pass from the forearm into the hand via a fibro-osseous tunnel (the first dorsal compartment). Evaluation of histopathological specimens shows a thickening and myxoid<unk> generation consistent with a chronic<unk> generative process, as opposed to inflammation. The pathology is identical in<unk><unk>  seen in new mothers.
De Quervain syndrome
Scaphoid fracture
Lambert–Eaton myasthenic syndrome
Terson syndrome
Achard syndrome
Upper motor neuron syndrome
Brody myopathy
Nance–Horan syndrome