Just wanted to add that I agree with Becky that microinvasion is where the DCIS truly invaded. At the same time, a microinvasion is very small, less than 2mm. I've read that invasive cancers do not usually form blood vessels until they are about 2mm large. Presumingly, you microinvasion was less than 2mm and has VERY little risk of spread. Remember, the lymph and blood vessels are what cause spread of cancer and let the cat out of the bag.
You may want to check your orginal pathology for any lymphovascular invasion as an indicator of angiogenesis or vessel formation around your microinvasion. Also, was a sentinel node done. Was the node positive for micromets by IHC or H&E?
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Robin
2002- dx her2 positive DCIS/bc TX Mast, herceptin chemo
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