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. 2012 Feb;33(2):286–291. doi: 10.3174/ajnr.A2748

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© 2012 by American Journal of Neuroradiology

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Fig 5. — Schematic representation of the variations of the rostral SSS. A, Type 1, classic anatomy, with a fully developed rostral SSS (arrowhead) receiving multiple bilateral frontal veins. B, Type 2, duplication of the rostral SSS, with each hemi-SSS (arrowheads) draining ipsilateral frontal veins. C, Type 3, complete hypoplastic rostral SSS, with compensatory drainage through bilateral parasagittal superior frontal veins (arrows). D, Type 4, unilateral hypoplastic rostral SSS, with compensatory drainage through a parasagittal superior frontal vein on 1 side (arrows) and a hemi-SSS on the other (arrowhead).