Etiologies of FUo a Collagen -Vascular-Disease No diagnostic serology You need to recognize the syndrome otherwise no diagnosis a Still's disease(young or adult 口SLE 口 Giant cell arteritis }→15% of puc a Polymyalgia Rheumatica 1 口 Behcet's disease a Relapsing polychondritisEtiologies of FUO  Collagen-Vascular-Disease No diagnostic serology… You need to recognize the syndrome otherwise no diagnosis Still’s disease (young or adult) SLE Giant cell arteritis } → 15% of PUO Polymyalgia Rheumatica } Behcet’s Disease Relapsing polychondritis