Persistent embryonic veins in arteriovenous malformations of the posterior fossa.

In the arteriovenous malformations of the posterior fossa the arterial feeders and the dural venous sinuses can be identified in anatomical terminology. The arterialised veins which do not conform to adult anatomical descriptions represent the persistent embryonic veins of the metencephalic and myelencephalic segments of the developing brain. These can be identified and described when related to the embryo.