It is characterized by a deficiency in biliary copper excretion that causes deformations in the skeleton. These include projections on the back of the skull (parasagittal bone exostoses arising from the<unk>  bone—the so-called<unk> <unk> s") as well as deformities of the elbow, radial head dislocation, hammer-shaped lateral ends of the clavicles, and abnormalities of the hips and pelvis.<unk>  presents in early to middle childhood. Children may present with features such as:
Occipital horn syndrome
Lateral medullary syndrome
Medial medullary syndrome
Central cord syndrome
Posterior cord syndrome
Surfer's myelopathy
Lateral pontine syndrome
Medial pontine syndrome