Ankylosing Spondylitis as a Deceptive Visage of Multiple Myeloma: a case report

A 38-year-old male came to outpatient clinic complaining of a new-onset pain of his right buttock which has caused him to limp. Since 6 months ago, the pain had involved in order his cervical spine, ribs, sternum, and thoracic spine, and left them deformed. He also had constitutional symptoms and significant weight loss. On physical examination, there was a limited chest expansion, positive Schober’s test, and multiple tender bony bumps along the ribs, costosternal and costochondral junctions. Laboratory tests showed anemia, elevated erythrocyte sedimentation rate, normal level of serum calcium, and creatinine, and 1+ protein in urinalysis. Serum protein electrophoresis was unexceptional. The imaging of the patient changed the diagnostic path. This article describes a deceptive visage of multiple myeloma presenting itself in the clothing of ankylosing spondylitis