Hi Joe, med dictionary says the following:
thoracic inlet (thō·raˑ·sik inˑ·lt),
the intersection of the neck and thoracic cavity, consisting of the upper end of the sternum (the manubrium), the first thoracic vertebra, and the first ribs and their cartilages.
Guessing that would be upper chest/throat area.
I am so sorry to hear the op hasn't been successful, you must be distraught. Maybe you can push for a redo by someone more able?