so there is no more blood flow getting to that abnormality in the kidney. if you stop the blood flow to it it can't grow any more, it starts to shrink. it also can't bleed any more. if this was an abnormality in the kidney, for example, they thought was at risk for bleeding, this is one way to treat it. this type of procedure, incidentally, don, is done by a radiologist, interventional radiologist, not something done by a surgeon typically because it does involve the catheters and the glue. that's what an embolization is. >> embolization for a benign condition. what about, sanjay, the first lady staying at walter reed for the week? is that unusual or typical for this kind of procedure? >> i would say that's unusual. when you think about these procedures, they can even be done on an outpatient basis meaning you come in in the morning and you're discharged by the evening. sometimes people stay overnight because they want to make sure that when this glue is sort of blocking those blood vessels, someone does president start to