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Mikayel Grigoryan, MD; Scott D. Geisler, MD; Erik K. St. Louis, MD; Gary L. Baumbach, MD; Patricia H. Davis, MD

Arch Neurol. 2009;66(4):528-531.

Objective  To describe imaging findings as well as postmortem brain and cardiac pathology in a patient with fulminant idiopathic hypereosinophilic syndrome.

Design  Case report.

Setting  University hospital.

Patient  A 48-year-old right-handed man with hypereosinophilia, rapidly progressive encephalopathy, and focal neurological deficits who died 22 days after presentation.

Main Outcome Measures  Physical examination, radiologic, and neuropathologic examination results.

Results  Imaging of the brain revealed bihemispheric ischemic changes in and beyond the watershed distributions. Pathology review demonstrated mural cardiac thrombus that likely caused cardioembolism as well as diffuse microangiopathy despite resolution of the hypereosinophilia.

Conclusions  Timely recognition of idiopathic hypereosinophilic syndrome may enable aggressive treatment prior to widespread cardioembolism and degranulation that result in devastating cerebrovascular complications.

Author Affiliations: Departments of Neurology (Drs Grigoryan, Geisler, St. Louis, and Davis), and Pathology (Dr Baumbach), University of Iowa Hospitals and Clinics, Iowa City.

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