Premature filling of veins is a manifestation in cerebral angiography of:

Diagnosis of AVM is made by conventional catheter cerebral angiography Diagnosis is based on demonstration of aeries and veins on the same conventional angiographic image, proving the high-flow shunting of blood (leading to early filling of veins) through the nidus network or fistulous vessels In the typical AVM, there is a cloudlike nidus, or network of smaller vessels, well seen on angiography Ref: Sabiston 20th edition Pgno: 1925