Lesson of the month: Large vessel vasculitis: A rare cause of transaminitis.

We present the case of a 73-year-old male with pyrexia of unknown origin (PUO). He was a returned traveller from Southern Africa and underwent extensive investigation to rule out an infective cause. This was mostly unrevealing but there was a notable transaminitis (ALT predominant) with normal bilirubin level. He showed no serological or clinical improvement despite antibiotic treatment. Subsequent CT-PET showed high mural uptake in the thoracic and abdominal aorta and its major branches, confirming the diagnosis of Large Vessel Vasculitis (LVV). This case highlights the importance of considering LVV in patients with PUO and with transaminitis.