Fever of unknown origin: a rare retroperitoneal cause.

The authors present a patient with fever of unknown origin and vague loin pain. Baseline investigations revealed elevated inflammatory markers and imaging eventually identified a renal mass. Radical nephrectomy was performed at a collaborative surgical list involving both the urology and vascular surgical teams. Histological examination confirmed a retroperitoneal paraganglioma and the patient made a rapid recovery and remains well at follow-up. This case draws attention to the rare diagnosis of retroperitoneal paraganglioma and the potential for diagnostic delay. Furthermore, the vital multi-disciplinary approach to the optimum management of patients with such tumours is highlighted.