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what type of radiology study did you have? did you have a CT or MR angiogram?
a filling deficit is when a contrast agent is used in a location, like a GI cavity, bowel, or sinus, or blood vessel
so when the contrast doesn't fill the whole area and this is seen, this is a filling deficit. and means there is something there preventing the contrast from filling the whole area.
that partial deficit means there may still be a blood clot or plaque in the blood vessel inside preventing the contrast from going in the whole blood vessel.