Intracerebral Masson's Tumor-Slow-Filling Vascular Lesion Demonstrated by Indocyanine Green Video Angiography

Abstract

Background: Intravascular 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 description: We 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).

Conclusion: Masson'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.

Keywords: Indocyanine green video angiography; Intravascular papillary endothelial hyperplasia; Masson's tumor.