My three-year-old had a 4-inch teratoma removed from (well, with) one ovary earlier this year. Without having any idea about the prevalence of teratomas in humans historically, I wonder: is it scarier to have symptoms and not know what it is, or to know what it is and not have the means to treat it. The fact that it's real and not just a tearout from a Junji Ito story is frightening enough in modern times.