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Osteomalacia is a metabolic bone disorder characterized by impaired mineralization of bone matrix. Symptoms of osteomalacia can be confused with other conditions such as spondyloarthropathy, polymyalgia rheumatica, polymyositis, and fibromyalgia. In this case, we report a patient with axial osteomalacia who developed low back pain, morning stiffness, and “grade 3 sacroiliitis” in pelvis X-ray, leading...