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One thing I have heard is that the docs say they don't want to expose us to more radiation than necessary. They have other screening tools that can help catch mets. But, these don't work always for brain and other mets unless a marker is up like mine was. Plus the blood work has to be done in the first place and many docs don't trust that either!!!
The insurance providers may also discourage too much expensive scanning, without symptoms of some sort to report as a reason for the scan. I know we often have to "exaggerate" a symptom to get our screening brain MRI's.
If we all ask our docs, we will probably get numerous answers, some satisfactory and some not!
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