Table 1.

Summary of features of pulmonary metastases on chest CT for OS

Features of pulmonary metastases in OS
Features likely indicative of metastases:
Multiple nodules (especially >7)
Nodule size >5 mm (>6 mm specificity ~90%;>13 mm specificity 100%)
Nodule calcification (~60 vs 12% in benign nodules)
Change in number or size of nodules after chemotherapy
Features likely indicative of benign nodules:
Single nodule (~70% non-metastatic)
Nodule size <5 mm (~70% non-metastatic)
Subpleural location
No change in size or number after chemotherapy

OS, osteosarcoma.