Masson's tumour: Differential diagnosis of neck lump in children

Summary Masson's tumour or papillary endothelial hyperplasia (PEH) also known as Vegetant Intravascular Haemangioendothelioma or Intravascular Angiomatosis is a uncommon, benign proliferation of endothelial cells in normal blood vessels or vascular conditions like hemangiomas, pyogenic granuloma, etc. It is important to distinguish PEH from angiosarcoma. Although it has been reported to affect the head and neck region it is still frequently forgotten in the differential diagnosis of lateral neck masses in children. We discuss the management of a case of Masson's tumour presenting as a lateral neck mass in a 5-year old, and review the literature available in this particular topic.