Lymphatic Mapping Of Oropharyngeal Cancer

This study is testing a new imaging technique to map the lymph nodes involved in throat cancer (specifically oropharyngeal cancer). The goal is to find more precise ways to target only the affected lymph nodes, potentially reducing side effects from treatment. **You may be eligible if...** - You are 18 or older - You have a new diagnosis of oropharyngeal cancer (cancer of the throat/tonsil area) - Your cancer has spread to lymph nodes on only one side of the neck - You are scheduled for surgery or radiation treatment **You may NOT be eligible if...** - There is suspected cancer spread to lymph nodes on both sides of your neck - You have had prior treatment for head and neck cancer - You are pregnant - You have certain allergies to imaging agents Talk to your doctor to see if this trial is right for you.