Supraclavicular lymph nodes - has anyone experienced spread to this area?

I have classic PTC that went from nothing to aggressively spreading to my supraclavicular and mediastinum (chest) lymph nodes in <5 years.

So far I am unable to find any concrete info online on what happens to those with spread to the supraclavicular lymph nodes. It's apparently extremely rare?

My endocrinologist says my PTC is stable but won't really discuss it further, just monitoring it at the moment. I have clear neck ultrasound scans at the moment but my TG and anti-TG ABs are still elevated.

Have any of you (or anyone you know) had supraclavicular lymph node involvement? I want the truth, even if it is grim or scary. Any good/positive news would be great also.

Edit: I had a TT+neck dissection in May 2023 and RAI in August 2023.