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17-year-old girl with history of osteosarcoma of left fibula. Coronal volume-rendered image reveals mass within subcutaneous tissues of posterior left lower chest with cloudlike calcification (arrow), consistent with soft-tissue metastasis due to osteosarcoma. Two smaller masses are seen inferior to left scapula and between left ribs (arrowheads). Fluffy ossification in soft tissues with central hyperdense ossification is characteristic of osteoid matrix.
