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Pulmonary metastasis rarely originates from a benign tumour, but may occur from giant-cell tumours of bone (GCT). It occurs most frequently in recurrent cases and may result in poor outcomes. We report a case with pulmonary metastases from huge ulcerated recurrent GCT at distal ulna, from diagnostic to limb salvage surgery procedure. Five months after surgery, unfortunately he passed away due to pulmonary metastases.