mastoid emissary vein

mas·toid em·is·sar·y vein

the vein that connects the sigmoid sinus with the occipital vein or one of the tributaries of the external jugular vein by way of the mastoid foramen.
References in periodicals archive ?
CTA revealed two dehiscence of sigmoid sinus wall and a mastoid emissary vein on the right side.
In third patient, although there are reports that mastoid emissary vein can lead to PT, but the operation result show that this patient's mastoid emissary vein is not the cause of the disease.