WD-mimicking disorders encompass <i>ATP7A</i>-related neurodegenerations (Menkes disease, occipital horn syndrome, X-linked distal hereditary motor neuropathy), MEDNIK syndrome, Huppke-Brendel syndrome, aceruloplasminemia, congenital disorders of glycosylation, primary familial intrahepatic cholestasis type 3, and acquired copper deficiency syndromes. The gene discussed is ATP7A; the disease is aceruloplasminemia.