Vascular anomalies



Vascular anomalies are normally classified in two different groups: malformations or tumours. They are often confused, especially when it comes to diagnosis.

Vascular malformations occur because of an error in the development of vascular embryogenic tissue, meaning that they are present at the time of birth. Vascular tumours, on the other hand, appear after birth (except congenital haemangiomas), within a period that can vary from a few weeks to several months or many years.

In this book, we will describe tumours and malformations as different entities, focusing our attention on vascular tumours.


This educational material covers basic information on PI3K related overgrowth syndromes (PROS), Proteus syndrome, Parkes-Weber syndrome or Sturge-Weber syndrome. This material is in constant evolution and further revisions will be done once per year. If you have information to add, please, send us an email to