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Position of the ‘Venous Angle’ in the Median Sagittal Plane

The deep veins of the brain, particularly the internal cerebral vein and its tributaries, can supply valuable information about adjacent cerebral structures. They are thus an important aid in the diagnosis of expanding intracranial lesions as well as in the investigation of malformations and other pathologic conditions of the brain substance. The so-called 'venous angle' has been given much attention in the literature. The term venous angle is not altogether correct, but it is used by some investigators to designate the angle formed between the striothalamic and internal cerebral veins. This angle may be distinguished more or less readily in lateral views; it appears in about 80 % of all carotid angiographies, and its apex marks the posterior superior limit of the interventricular foramen. The position of the internal cerebral vein may be assessed without difficulty in the a.p. projection. It is harder to localize the venous angle in the sagittal plane because consideration must be paid not only to physiologic range in relation to