- All patients must have disease-free status documented by a complete physical examination and imaging studies within 42 days prior to registration; imaging studies must include a total body positron emission tomography (PET)-computed tomography (CT) scan that is of diagnostic quality (with or without brain) or a CT of the chest, abdomen and pelvis; for patients with melanoma arising from the head and neck, dedicated neck imaging (CT with IV contrast or PET-CT through the region) is required; if the patient has had unknown primary with disease in the axilla, neck imaging is required to assure region is clear of cancer; CT imaging should be done with intravenous contrast if there are no contraindications for it; any other clinically-indicated imaging studies if performed (e.g. bone scan) must show no evidence of disease