Same-session MR-only Simulation and Treatment With MRI-guided Adaptive Palliative RadioTherapy

Inclusion Criteria: * Diagnosis of malignancy (biopsy proven or high clinical suspicion with urgent/emergent clinical indications for palliative RT) * Requires delivery of palliative radiation therapy for the treatment of painful metastasis, hemoptysis, gastrointestinal bleeding, pelvic bleeding, or superior vena cava syndrome/bulky mediastinal disease. * At least 18 years of age. * Able to understand and willing to sign an IRB-approved written informed consent document. Exclusion Criteria: * Pregnant. Patients of childbearing potential must have a negative pregnancy test within 14 days of study entry. * Medical contraindication to undergoing MR imaging.