Wilson's Disease Masquerading as Juvenile Idiopathic Arthritis in an Adolescent.

Wilson's disease (WD) is a rare autosomal-recessive inborn error of copper metabolism characterized by the toxic accumulation of copper in liver, brain, cornea, and other tissues. It has a variable clinical presentation. Musculoskeletal presentations are very unusual. We report a 17-year-old male who presented to us with juvenile idiopathic arthritis (JIA), which later proved to be a case of WD.