That's one of the ways I use PDF reDirect... to combine PDF files and organize the imported items. (thanks Wendell, for recommending this program back in a discussion about printing entire charts... I love it, especially the price [free]:
www.exp-systems.com). If find it much faster than the "combine" feature on Adobe Standard.
You could print all those mammo reports to the PDF reDirect driver, then save it, import that file and name it "Mammograms 1999-2009" in the radiology folder... then delete the individual reports from the imported items window.
I do a similar process with notes/reports/etc from a hospital admission... grouping them in a nice appropriately named file.