CTICasesRadiation Pneumonitis
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Imaging findings
Follow-up chest computed tomography in a patient with metastatic carcinoma status-post left pneumonectomy reveals new focal areas of ground-glass opacity and consolidation in the remaining right lung. Correlation with the 3D conformal radiation therapy planning CT demonstrates that these new opacities align precisely with the spatial distribution of the highest isodose treatment curves surrounding a previously targeted metastatic nodule.
Key takeaways
Radiation pneumonitis typically presents as ground-glass or consolidative opacities within a few months of completing radiation therapy. The key diagnostic feature is the spatial correlation of these lung changes with the planning CT's isodose lines, often crossing anatomical lobar boundaries and conforming to the shape of the radiation portal.
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