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Osteosarcoma is the most frequent primary malignant mesenchymal bone tumour in children and adolescents. Although the lung is the most common site of its metastasis, to the best of our knowledge, it is infrequent to have hypervascular pulmonary metastasis, particularly in the post-operative period. Herein, we report a case of a 15-year- old boy who presented with a rapidly enlarging lung mass on a background of osteosarcoma of left proximal tibia. The progressively enlarging right lung mass was detected as an opacity on a chest radiograph, three months post-surgical resection of the osteosarcoma. Computed tomography of thorax revealed a contrast-enhancing hypervascular right lung mass. This was complicated with intra-lesional haemorrhage post-biopsy. Histopathological examination (HPE) confirmed metastatic osteosarcoma. We discuss the rarity of this occurrence and its imaging findings.
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