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A 43-year-old Muslim woman presented with intermittent fever, lethargy, poor appetite and weight loss for a month and altered behaviour for a week. She had a holiday trip to the provincial town of Hat Yai in South Thailand 7 months prior where she had eaten pork-free street food. On admission, she was confused, lethargic and not obeying command. There was no motor deficit.
Septic workup for bacterial and fungal infections was negative. Cerebrospinal fluid analysis showed pleocytosis with a negative tuberculosis (TB)-PCR result. IgG serology for HIV, Toxoplasma gondii and Taenia solium was negative.
Initial CT brain showed white matter hypodensities at bilateral frontoparietal regions. Several small peripherally enhancing parenchymal lesions seen on contrast-enhanced CT. These lesions were well circumscribed with no calcification or soft-tissue component. No hydrocephalus was seen.
MRI brain later revealed multiple small rim-enhancing cystic lesions in the basal ganglia, grey–white …