• Veejay Bagga, Ahilan Kailaya-Vasan, Stephen B Wharton, and Umang Patel.
• Department of Neurosurgery, Royal Hallamshire Hospital, Sheffield, United Kingdom. Electronic address: vbagga@doctors.org.uk.
• World Neurosurg. 2017 May 1; 101: 812.e15-812.e19.

BackgroundIntravascular papillary endothelial hyperplasia, or Masson's tumors, are benign vascular lesions that are rarely seen intracranially. The vascular characteristics of these lesions are also unknown.Case DescriptionWe report the case of a 24-year-old male patient with a 3-year history of headache and dizziness. Neuroradiologic imaging showed a slow-growing lesion consistent with a low-grade glioma. Intraoperative appearance was of a vascular lesion that was slow filling as demonstrated with indocyanine green video angiography. Histologic analysis following resection revealed intravascular papillary endothelial hyperplasia (Masson's tumor).ConclusionMasson's tumors are slow-filling vascular lesions. The preoperative diagnosis of this lesion is difficult as it can mimic a neoplastic lesion. Conservative and surgical treatment options should therefore be carefully considered. Patients with subtotal resection must undergo long-term follow-up surveillance imaging as recurrence is a possibility.Crown Copyright © 2017. Published by Elsevier Inc. All rights reserved.

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