Does anyone know a specials in the field for retroperitoneal fibrosis in the Chicagoland area?

My brother just diagnosed with a tumor size of 2 golf balls plus is embedded in the cavity. The team of doctors at Rush in Chicago told us the tumor is in a very serious and uncommon location. Just to get a biopsy will be tedious and dangerous. He’s has a stent, kidney’s are in bad shape, swollen leg and testicals. Everyday he is getting weaker and weaker.

Iwent on site once again and I did find several doctors into the Chicao area. Not sure why they didn't come up last time I was on the site, (probably cause I didn't enter something right) but I FOUND DOCTORS here in Chicago.

Thank you, thank you, thank you~