Identification of the anterior and posterior commissures by angiography

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Abstract
✓ A simple method has been developed by which the approximate location of the anterior and posterior commissures can be identified on the venous phase of the cerebral angiogram. The venous angle, and the junction of the internal cerebral vein and vein of Galen, are used as reference points since these structures were found by measurement on midline sagittally-sectioned brains to have a relatively constant spacial relationship to the commissures. This method for locating the commissures by angiography does not depend on the relationship of the deep venous structures to bone landmarks on the skull. Its chief limitation is that in 20% of the patients a true venous angle cannot be identified.