It looks like you have one small cystic thyroid nodule, otherwise your thyroid looks healthy. Your nodule/cyst is small (less than 1 cm in any dimension), so it is very unlikely they will do anything further at this point other than monitor the nodule by ultrasound (once a year or perhaps less frequently).
If it is entirely cystic, it is most likely benign. Some fluid filled cysts have solid components, which increases the risk of cancer, but according to your ultrasound, minimal internal echoes and no internal vascularity sounds like it is cystic with no solid components. (And, even if it had solid components, most thyroid nodules are not cancerous.)
Sometimes cysts can change is size or cause discomfort, otherwise, they are usually left alone.
Good luck, and I hope this helps.