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A 50-year-old Chinese woman with a history of weakness and paroxysmal seizures of the left limb presented to our hospital with a ten-day history of neck pain. Imaging showed that there was a mass in the frontal lobe of her brain. On resection of the mass, a motile worm was identified. Morphological observation and molecular analysis of the mitochondrial COX1 and 28S rRNA genes of the worm extracted from the brain identified the causative agent as Spirometra mansoni. Homology search of the polymerase chain reaction (PCR)-amplified products from the case was conducted against gene fragments from local wild frogs. High homology was found between them, showing her likely exposure was frog consumption.

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