wagr syndrome wilms tumor, aniridia, genitourinary anomalies, and mental retardation syndrome wd wilson's disease wee western equine encephalitis ws williams syndrome ws4 waardenburg syndrome type 4 x acronyms diseases and disorders x-ald x-linked adrenoleukodystrophy x-cald x-linked cerebral adrenoleukodystrophy xdh and aox dual deficiency xanthine dehydrogenase and aldehyde oxidase combined deficiency xdh deficiency xanthine dehydrogenase deficiency xdp x-linked dystonia-parkinsonism xdr tb extensively drug-resistant tuberculosis xhed x-linked hypohidrotic ectodermal dysplasia xlmtm x-linked myotubular myopathy xlos x-linked opitz g/bbb syndrome xlp syndrome x-linked lymphoproliferative syndrome (see duncan disease) xlsa x-linked sideroblastic anemia xmea x-linked myopathy with excessive autophagy xmen x-linked immunodeficiency with magnesium defect, epstein-barr virus infection and neoplasia xp xeroderma pigmentosa xscid x-linked severe combined immunodeficiency xxx syndrome triple x syndrome y acronyms diseases and disorders yf yellow fever yns yellow nail syndrome yss young–simpson syndrome yvs yunis–varon syndrome yy syndrome double y syndrome z acronyms diseases and disorders zap-70 deficiency zeta-associated-protein 70 deficiency zbls zadik–barak–levin syndrome zes zollinger–ellison syndrome zls zimmermann–laband syndrome zs zellweger syndrome zsd zellweger spectrum disorders zss zellweger syndrome spectrum zttk syndrome zhu–tokita–takenouchi–kim syndrome