Depending on the structure set, there may or may not be a patient external contour created in the provided DICOM RT Structure Set. If your TPS requires a patient external contour/skin, and you do not see one in the structure set you downloaded and imported, then you will need to add your own. NOTE: Some structure sets may contain a "skin" contour that is actually a thin rind (e.g. 5 mm thick) and those will not work as your patient external contour because they will be hollow.
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