The radiologic technique, including the areas of interest (your brain) is much different than that used for evaluation of the sinuses. That is not to say that one or more sinuses might be visible on the brain scans you have but to state the fact that any worthwhile evaluation of your sinuses should be conducted with a CT scan, specific for your sinuses.
It would be nice to be able to avoid the time, expense and radiation exposure of further scanning but I don’t believe that is feasible.
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