came up with a classification for these renal cysts. we have four different types of classification, bosnjak one and two, three and four are more aggressive. you want to remove them and make sure if it s one of those, then your meteorologistist will recommend removal. thanks for the nyu nod. but he says he has pain. so one thing that can happen with simple cysts, and again, we re talking a simple cyst here, it can actually obstruct. so somebody has to make sure that it isn t obstructing the flow through the tubals. now, assuming that that is not the case, you can just follow it. the more complex ones, those are the ones you worry about. talking about kidney cancer for a minute, which we haven t covered here before, what puts you at risk for that, eric? high blood pressure, obesity, the thingsz we were worried about at the beginning of the show. smoking. we re always worried about smoking. and the other thing is workplace