Uncommon onset manifestations without renal involvement in microscopic polyangiitis: A case report.

Microscopic polyangiitis (MPA) is a rare, idiopathic, autoimmune, systemic disease that most frequently involves the kidneys. The present study reports the case of a 48-year-old female patient who presented with diffuse myalgia, arthralgia of both hands and feet for 2 weeks before being admitted to the hospital. The patient exhibited involuntary loss of weight and occasional slight fever.