Hyperferritinemia and Pyrexia of Unknown Origin

By the time a patient is formally categorized as having 'Pyrexia of Unknown Origin', a battery of tests have been performed and many physicians have run out of differential diagnoses. Adult Still's Disease is considered a rheumatologic disorder and is, therefore, not considered if the patient does not have joint symptoms. We present the case of such a patient who presented with high spiking fever, and review how we gained confidence in establishing the diagnosis