Question about neuroblastoma in children

It seems like a major stretch to me that they can go from Mickey being fine to having neuroblastoma just from running a high fever.  I went to cancer.net and Mayo to do a little reading and the current SL still seems like someone is taking liberties with the writing.  I know we have a couple of medical professionals as board members, so I was hoping someone more knowledgeable would fill me in with details.