Yup: [Abuse of anabolic steroids and its impact on thyroid function]. https://www.ncbi.nlm.nih.gov/pubmed/18209883
He got punched in the throat which caused a blood clot and damage. Was two years ago now, seen specialist had cameras down his throat etc. They say it will fade with time.
The same happened to Robert Helenius at one point. He gog punched in the throat and his voice was like that for a while.