Masson’s tumour of the kidney

In 1923 Masson described a neo-plastic process consisting of papillary hyperplasia of the vascular endothelial cells, with a consequent obliteration of the vascular lumen, followed by degenerative changes. He introduced the term ‘vegetant intravascular hemangioendothelioma’. However, these days it is more commonly known as papillary endothelial hyperplasia (PEH) [1]. Although relatively rare, there are numerous accounts of PEH in literature, describing its predilection for the head and neck region. Our case report describes the finding of a PEH within the kidney; a site previously described only once in the literature.