Intravascular papillary endothelial hyperplasia (Masson’s tumour) arising from the superior sagittal sinus masquerading as an aggressive malignant lesion: A rare case report

Abstract

Intravascular papillary endothelial hyperplasia (Masson's Tumour) is an infrequently occurring reactive vascular lesion which is typified by papillary intravascular proliferation of endothelial cells. It was first described by Masson in his publication in the year 1923. It usually arises in the extra-cranial location ordinarily in the skin and subcutaneous soft tissue. They are extremely uncommon in the intra-cranial sites with only a handful of cases reported in the literature amongst more than 300 cases of the same lesion reported in the sites arising outside the cranium. The authors here would like to report a rare case of Masson's tumour arising from the superior sagittal sinus eroding the skull bone and ultimately leading to an oval defect in the skull. The one-off nature of this location is what is intriguing in this case.