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Extra-osseous Paget’s disease. a Sagittal CT reconstruction and b T1-weighted MR sagittal image demonstrate anterior longitudinal ligament ossification (white arrows). c, d Axial CT sections demonstrate ossification in the ligamentum flavum due to extra-osseous PD (black arrows) in a different patient. e Antero-posterior radiograph in another patient demonstrates paravertebral soft tissue swelling (dashed arrows) producing the “pseudo-sarcoma” appearance
