A 47 years old presented to A&E department because of choking. Apart from the problem, you notice something on her neck in which she defaulted treatment ten years ago. Below is the picture of her neck
1) What is your finding in the picture?
2) What is your differential diagnosis?
3) What further history you would like to obtain to make a provisional diagnosis
4) What investigation you would like to perform to support your provisional diagnosis.
5) What other signs that you would like to look for and why?

