...I Concur with Husker, There is No problem here. Take a Vise Grip, with 'Rounded Jaws', crush the rusted tube to Collapse it. Twist and Turn, as You pull it out. Very few pieces will drop in. Because it is rusted thin, it doesn't take a lot of force to crush it out. A Shot of WD-40 wouldn't Hurt. Even Soak it over-night. It will Help Break-Up the Rust.
You can find a new tube at the NAPA Auto Parts Store.
Good Luck with it.