CTICasesRadiation-Induced Organizing Pneumonia
Imaging findings
Patchy consolidation, ground glass opacities, and a "reverse halo" sign in areas remote from the radiation field.
Key takeaways
This is a documented, steroid-responsive phenomenon occurring within the first year after breast cancer radiation therapy. It is often misdiagnosed as infection but is thought to be an immune-mediated response to low-dose radiation outside the primary treatment field.
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