Papillary endothelial hyperplasia presenting as recurrent malignant glioma.

The initial management of patients with malignant gliomas depends on accurate histologic diagnosis which, in turn, directs appropriate treatment planning. However, the diagnosis of recurrent disease is often based solely on radiological data which can occasionally be misinterpreted as showing recurrent tumor. Lack of awareness of conditions that mimic recurrent tumor and potentially confound radiological diagnosis can lead to inappropriate therapeutic decisions. We report the case of a patient whose imaging studies suggested recurrence of malignant glioma; however, surgical resection of the lesion guided by MRI scans resulted in the correct diagnosis of papillary endothelial hyperplasia and led to appropriate management of this condition that mimicked tumor recurrence. In this report, we provide a comprehensive review of this rare entity and emphasize the importance of adequately pursuing appropriate diagnostic considerations prior to making definitive treatment decisions.