Stereotactic Body Radiation Therapy in Treating Patients With Recurrent Primary Ovarian or Uterine Cancer

Inclusion Criteria: * Female patients \> 18 years of age. * ECOG 0 or 1. * Diagnosis of primary ovarian cancer of any histology (patients with diagnoses of fallopian tube and primary peritoneal cancer are also eligible), or primary uterine cancer of papillary serous histology. * Pathologic confirmation of eligible histology. * Three or fewer total sites of active disease (at least one site of active disease to be treated on study must be confined to the abdomen or pelvis excluding liver and must be \< 5 cm in greatest dimension as determined by pre-screening cross-sectional imaging). * Additional site(s) of active disease (such as parenchymal liver and lung metastases, or supraclavicular nodal metastases), should be considered for treatment (off study) with radiation, surgery, or another form of local therapy, at the discretion of the study PI. * Systemic therapy is allowed but SBRT cannot begin until \> or = 7 days after the last cycle of systemic therapy, and systemic therapy cannot be initiated or re-initiated until \> or = 7 days after SBRT. There will be no limit on prior lines of systemic therapy. * Patients with contraindications to intravenous (IV) contrast administration are still eligible for this study if the tumor can be delineated clearly without IV contrast (at the discretion of the treating radiation oncologist) but will not participate in the functional imaging studies. Exclusion Criteria: * Pregnant women. If patients are not status post bilateral salpingo…