An Investigational Scan (MRI) in Imaging Patients With Newly-Diagnosed or Recurrent Thymoma

Inclusion Criteria: * All adult patients scheduled to meet with a thoracic surgeon from MD Anderson Cancer Center (ACC) for resection of newly diagnosed thymoma or thymoma recurrence in the chest and scheduled for surgery Exclusion Criteria: * Children, defined as individuals younger than 18 years old on the preoperative visit with the thoracic surgeon * Pregnant patients * Patients unable to understand the consent form * Patients with metal within the chest and pacemakers * Patients with a known allergic reaction to gadolinium, who will have their MRI performed without contrast * Patients with glomerular filtration rate (GFR) \< 60 ml/min, who will have their MRI performed without contrast * Patients with an allergy to iodinated contrast material will follow departmental routine policy, that is those with anaphylaxis will have their CT performed without intravenous contrast and others will be prepped as for departmental guidelines for routine chest CT * Patients with abnormal renal function will have their CT study perform as per DI's iodinated contrast administration guidelines, and no contrast will be administered with GFR lower than 30 ml/min