Is it possible to add a "glow filter" to a mask?

what i wanna do seems simple (in my mind at least)…

i have an image that’s being masked by a circle movieclip. what i wanna do it add a glow filter to the circle/mask so that what you’d see is the image through the circle mask and the circle mask has a slight glow around it.

is that even possible?! can a mask even have a filter on it?!

thoughts?!

: : michael