Our experience with artificial slow flow carotid proximal compression angiography (P.C. angiography) in cases of A.V.A.s in the supply area of the internal and/or external carotid arteries is described. The method consists of percutaneous puncture of the common carotid artery with digital compression of the artery proximal to the site of injection. Following a description of technical details, more extensively reported in a previous paper, attention is paid to the specific properties of P.C. angiography in A.V.A.s, such as: (a) preferential staining of A.V.A.s of the scalp and/or the dura mater in the supply area of the external carotid artery; (b) angiographic subtraction due to suppressed filling of certain intracranial arteries, which may result in better visualization of the malformation; and (c) angiographic addition, consisting of increased density in staining, more extensive staining of the arteriovenous flow pattern than visualized in the routine angiograms, or addition of flow features demonstrated in successive routine angiograms in 1 of the P.C. angiograms, and finally demonstration of dural feeders not visualized in the routine angiogram. The use of P.C. angiography for the evaluation of the vascular dependency of extra- and intracranial A.V.A.s is also discussed.