New MRI Biomarkers in Head and Neck Cancers

This study is evaluating new MRI techniques to better detect and monitor head and neck cancers — including thyroid cancer — that have come back or spread to the neck, to determine if these advanced scans provide more useful information than standard imaging. **You may be eligible if...** - You are 18 or older - You fall into one of two groups: - You have a suspicious lesion in the head/neck area that may be a returning or spreading cancer - You have a confirmed diagnosis of recurrent, metastatic, or active head and neck cancer (including certain thyroid cancers) and are planning treatment at MSK (Memorial Sloan Kettering) **You may NOT be eligible if...** - You would need sedation or anesthesia for the MRI - You have claustrophobia - You are receiving cancer treatment at a different institution - You have a known allergy to gadolinium-based MRI contrast dye - You have a pacemaker, aneurysm clips, or other metal implants that are not MRI-safe - You are pregnant - You are unable to cooperate with the MRI procedure Talk to your doctor to see if this trial is right for you.