Early diagnosis of large vessel vasculitis: usefulness of positron emission tomography with computed tomography.

Fever of unknown origin is a diagnostic challenge. Among its causes are of large caliber vessels vasculitis (LCVV), including Takayasu arteritis (TA) and giant cell arteritis (GCA). Early diagnosis is vital to prevent fibrosis of the vessel wall, and consequently, stenoses, aneurysms or occlusions. Imaging techniques can be of great help in recent years, highlighting the temporal artery through ultrasound, MRI and PET-CT.