MULTIPLE myeloma (MM) is a hematologic malignancy of differentiated plasma cells that accumulate and proliferate in the bone marrow. MM patients often develop bone disease that results in severe bone pain

osteolytic lesions

and pathologic fractures

1 presenting with unexplained backache or bone pain in the long bones

ribs

skull

or pelvis.2 However

the low backache mimicking spondyloarthritis in MM is uncommon during clinical practice. Spondyloarthritis is a chronic systemic inflammatory disorder of the axial skeleton

mainly affecting the sacroiliac joint and spine causing low backache.3 Here we report a patient with MM which was initially misdiagnosed and treated as spondyloarthritis.