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Background Acute necrotizing encephalopathy (ANE), known as influenza‐associated encephalitis, typically affects children. Case presentation A 70‐year‐old woman was admitted to the hospital with altered consciousness, a high temperature, and severe hypotension. Computed tomography (CT) of the head showed no abnormalities; thus, a diagnosis of suspected severe heat stroke was made. On day 2, repeated head CT revealed bilateral symmetrical lesions to the thalamus, and a rapid influenza antigen test was positive. Based on the CT findings and the medical history of influenza, a differential diagnosis of ANE was made. Subsequently, brain edema spread across the whole brain, and the patient died on day 21. Conclusion In elderly patients, differentiating ANE from severe heat stroke in a high‐temperature environment is difficult because of the similarities in clinical symptoms due to multiple organ failure. |
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