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Summary. It has been accepted generally that the superior sagittal sinus takes origin at the foramen caecum. While this obtains in a few, 58 per cent of the cadaver specimens examined have a one-to-three centimeter atresia of the most rostral end of the sinus. In these the veins of the frontal poles of the brain were directed medially and caudally to join in the midline, thus establishing the lumen of the sinus. In instances of more extensive atresia, the anterior superior cerebral veins, as well as those from the infero-mesial poles, all course medially and caudally to form the sinus. In other words, the longer the atretie segment, the more striking the change in venous patterns oi the superior and mesial frontal lobes of the brain. Atresie du sinus rostral sagittal superieur avec signes veneux cerebraux associesRgsumd. On admet g@ndralement que le sinus sagittal supdrieur nait dans le foramen caecum. Mais 58% des cadavres examinds pr@sentaient une atrdsie de 1~ 3 cm de l'extrdmit@ la plus rostrale du sinus. Dans ees eas, les veines des p61es frontaux du cerveau se dirigeaient vers le milieu et le bas pour se joindre sur la ligne mddiane, formant lc lument du sinus. En eas d'atr6sie plus dtendue, les veines c6rgbrales antdro-sup6rieures et les veines des p61es inf@ro-mddians sent mddianes et se dirigent vers l'arrigre pour former le sinus. En d'autres termes, plus l'atrgsie est @tendue, plus les modifications des veines sent importantes sur les parties sup@rieures et m@dio-frontales du cerveau. Atresie des rostralen Abschnitts des Sinus sagittalis superior: die dabei bestehenden Venen.MusterZusammenfassung. Bei einer Atresie des rostralen Sinus-Abschnitts, die mehr oder weniger ausgepr~gt sein kann, kommt es zu einer bestimmten Ver~nderung des ven6sen Abitusses im Bereich der Frontallappen.Neuroradiologists have made significant advances by angiography in the demonstration and interpretation of vascular anomalies of the central nervous system and its meningeal coverings. In cooperation with neurologists and neurosurgeons, clinical syndromes resulting from these malformations have been delineated. Less attention has been accorded some of the variations in venous patterns of the frontal brain and its overlying meninges associated with failure of development of the rostral superior sagittal sinus. This may stem, in part, from the incompleteness of filling of the venous system during angiography or, more likely, from the lack of awareness of these anatomical variabilities.

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