https://arstechnica.com/science/2021/11/intestinal-parasites-burrowed-into-mans-brain-and-lived-there-for-years/ [arstechnica.com]
But when doctors performed a CT (computed tomography) scan of his head, they quickly narrowed the possibilities. The scan revealed three calcified lesions in his brain, and doctors homed in on the diagnosis of neurocysticercosis. In other words, larval cysts from a pork tapeworm had migrated to his head years ago and nestled into various parts of his brain. The doctors documented their work on the man's illness in a case study [nejm.org] published on Thursday, November 11, in The New England Journal of Medicine.