The authors believe that cerebral angiography is the best neuroradio-logic procedure for the diagnosis of tumors of the choroid plexus of the lateral ventricles. Pneumographs needing a large quantity of contrast material are very traumatic and occasionally insufficient. In the 3 cases reported cerebral angiograms disclosed the presence of pathological circulation, enhancing a correct diagnosis. Another interesting point is the demonstration of the dilatation of the blocked temporal horn. In addition, angiography allows the study of the afferent and efferent vessels, thus facilitating surgical procedures. The angiographic picture in a case of carcinoma was different from those found in four papillomata cases.