Purpose or Case Report: Balamuthia mandrillaris is an amoeba that causes an uncommon but deadly encephalitis, referred to as granulomatous amoebic encephalitis (GAE). The highest incidence reported worldwide has occurred in America, and within the United States, it has been highest in the Southwest affecting predominantly children and young men of Hispanic ethnicity. Clinical presentation of GAE includes fever, headache, nausea, vomiting, lethargy, irritability, stiff neck, hallucinations, photophobia, and seizures. Our patient was a Hispanic male child living in Arizona. The patient presented at 3 years of age for severe encephalitis. Symptoms included difficulty with balance, gait, and sitting up and seizure-like activity. Initial CT showed an area of decreased density consistent with edema in the left frontoparietal lobe. Rapid progression was seen on further imaging over the length of the patient’s hospital stay revealing diffusion restriction, necrosis/blood products, edema, and hemorrhage. The patient expired from tonsillar herniation 22 days after the onset of initial symptoms and 4 days after admission to our institution. While there are multiple biochemical techniques that can test for B. mandrillaris, they are rarely employed for multiple reasons stemming from the rare occurrence of this infection. Balamuthia mandrillaris can cause a lethal brain infection. Because of the fatal nature of this infection, we propose 1) testing should be considered if a patient presents with progressing encephalitis on imaging and other pathogenic etiologies are ruled out and 2) the threshold to treat empirically should be low due to the fatal nature of the infection.
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