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Once swallowed, the eggs find their way into skeletal muscles or other tissues, where they form cysts and cause the disease known as cysticercosis.

Scans then found tapeworm eggs in his brain - and diagnosed cysticercosis.

Cysticercosis is a type of infection caused by the eggs or larvae of the parasite Taenia solium, also known as pork tapeworm, which can lead to cysts developing in the brain.

Recording the case in the American Journal of Case Reports, doctors wrote that it "can only be speculated" the man's cysticercosis was transmitted through autoinfection after "improper handwashing".

Eating undercooked pork cannot directly give a person cysticercosis.