This early phase I trial studies how well fluciclovine F18 positron emission tomography (PET)/computed tomography (CT) works in identifying the origin of head and neck squamous cell carcinoma in patients with cancer that has spread to the cervical lymph nodes. Fluciclovine F18 during a PET/CT scan may work better in helping doctors learn where the cancer started (called the site of origin) and directing treatment planning compared to standard fludeoxyglucose F-18 (FDG) PET-CT scans.
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Proportion of the suspected lesions that are positive by the gold standard of pathology
Timeframe: Up to 2 years