RT Journal Article SR Electronic T1 Idiopathic Hypereosinophilic Syndrome with Skull Base Involvement JF American Journal of Neuroradiology JO Am. J. Neuroradiol. FD American Society of Neuroradiology SP 971 OP 973 VO 28 IS 5 A1 M.L. Battineni A1 S.L. Galetta A1 J. Oh A1 M. Lango A1 J.J. Brooks A1 S.J. Schuster A1 L.A. Loevner YR 2007 UL http://www.ajnr.org/content/28/5/971.abstract AB SUMMARY: Idiopathic hypereosinophilic syndrome (HES) is a heterogeneous disorder characterized by prolonged eosinophilia without an identifiable cause, ultimately resulting in organ dysfunction. Three major types of neurologic involvement have been well defined in HES; however, to our knowledge, inflammatory pseudotumor (IPT) in association with HES has not been reported. We present a case of IPT of the skull base in a patient with HES that suggests that HES may result in an exaggerated immunologic or inflammatory response leading to the formation of IPT.