Inclusion Criteria:  For Aim 1 and Aim 3:  Patients treated within ongoing and completed clinical trials of chemoradiation and brachytherapy for cervix cancer with access to MRI/CT images at the time of diagnosis and brachytherapy For Aim 2 Patients undergoing postoperative or definitive radiotherapy and treated within trials of postoperative or definitive RT.  Exclusion Criteria:  Lack of disease or toxicity outcomes. Lack of images in the hospital database.