CT: computed tomography; FNA: fine-needle aspiration; MRI: magnetic resonance imaging; PET: positron emission tomography.
* In addition to evaluating the primary tumor, PET/CT is useful for finding occult distant metastases, unknown primary lesions, and synchronous second primary tumors. However, if the diagnosis of head and neck cancer is established, CT and/or MRI of the neck with contrast is often required for radiation or surgical planning in addition to PET/CT.