It's the end of 2012, and that means that it's time to take a look back at the year in retrospect. We'll be reading through the naughty and nice list (we've already checked it twice), and counting down the 25 best-performing stocks, and the 25 worst-performing stocks, in the health-care sector this year.

In this segment, Motley Fool health-care analysts David Williamson and Max Macaluso take a look at #6 on the nice list, Celsion (NASDAQ:CLSN), and how this company left investors with more than a little something extra in their stockings this year.