Assessing high grade T1 bladder cancer for presence of muscle invasion remains inaccurate. We hypothesize that MRI radiomic features can accurately demonstrate muscle invasion in high grade T1 lamina propria invasive bladder cancer. Radiomic features will be evaluated using MRI bladder cancer images. Radiomic features that correlate highly with muscle invasive disease will be used to assess the risks of muscle invasion in clinical high grade T1 disease.