a 45 year old male with a butterfly glioma received stereotactic biopsy for histologic confirmation of the clinical diagnosis microscopically the results were controversial since some biopsy specimens showed distinct inflammatory changes while others displayed typical features of a malignant glioma the patient died four days after the stereotactic approach due to therapy resistant intracranial pressure rise in addition to a large butterfly glioblastoma originating from the frontal part of the corpus callosum neuropathologic examination revealed a mycotic encephalitis with formation of numerous fungi containing inflammatory foci in all parts of the brain and in the glioma general autopsy disclosed pulmonary aspergillosis as the source of the inflammatory spread a previous steroid medication over several weeks for treatment of increased intracranial pressure may be considered as an important factor in the origin of the pulmonary aspergillosis complicating the butterfly glioma.