Biopsy and molecular genetic studies confirmed a diffuse infiltrative lesion, with evidence of FIP1L1-PDGFRA gene fusion.     ///    "This report describes the case of a 58-year-old lady, diagnosed with FIP1L1-PDGFRA positive hypereosinophilic disorder, who subsequently developed symptoms related to an intracranial lesion. "    ///    FIP1L1-PDGFRA positive chronic eosinophilic leukaemia and associated central nervous system involvement..     ///    " Interstitial deletion involving chromosome 4q12 generates the novel tyrosine kinase fusion protein encoded by FIP1L1-PDGFRA, which is present in many patients previously labelled as having hypereosinophilic syndrome, initially reported in 2003. "