Gaten Matarazzo, who is best known for his role as Dustin Henderson in Stranger Things, took to his Instagram to reveal that he is undergoing fourth surgery for a rare genetic disorder called cleidocranial dysplasia. The 17-year-old star had shared a picture of himself in the hospital and captioned the same as, "Surgery number 4! This is a big one! To learn more about Cleidocranial Dysplasia and how you can help those with the condition you can go to ccdsmiles.org." The actor has been receiving