I have had a swollen neck for awhile and have had issues with swallowing but just thought it was allergies. Went to my Dr and he sent me for ultrasound. Results were some sort of cyst (the nurse said they are not sure). It is 3.8cm wide and is pushing on myu corodid artery. I have a cat scan in the morning. What are the chances of this being cancer? Blood work came back normal. My Dr won't give me a referral until he sees what the ct shows. Very worried!