Adult-onset Still’s Disease Masquerading as Pyrexia of Unknown Origin with Severe Hyponatremia and Pleural Effusion: A Case Report

Adult-onset Still’s Disease (AOSD) is a rare autoinflammatory disorder marked by quotidian fever, evanescent rash, and inflammatory arthritis, often requiring exclusion of infectious and autoimmune causes before diagnosis. Hereby, the authors present a case report of 45-year-old female with a two-and-a-half–month history of daily high-grade fever, salmon-coloured maculopapular rash exacerbated during fever spikes, severe sore throat, and progressive polyarthralgia. Her illness later progressed t