Paget disease: unusual radiographic manifestations.

Paget disease (osteitis deformans) is not a difficult diagnosis when presented with typical radiographic features. However, an atypical appearance or an unusual location can be a diagnostic challenge, so we have emphasized the less common presentations, with their diagnostic clues. We have also considered such complications as malignant degeneration, fracture, and coexistent systemic disease, which can obscure the underlying Paget disease. The etiology, pathogenesis, and effects on bone structure and function attributed to Paget disease are updated.