@reeno I had a 16 mm cancer in my left breast - had lumpectomy and 6 weeks later 5 days of partial breast radiation. My radiation oncologist assured me that they would be able to avoid my heart and lungs. Went well with skin issues. At my 6 month diagnostic mammogram a good sized seroma was seen. My surgeon recommends waiting and re checking in another 6 months. I agreed to that plan. Has anyone else developed a seroma post lumpectomy/radiation? It is intermittently sore/achy/burny.