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Lateral venous lacunae

lateral expansions of the superior sagittal sinus of the dura mater, often increasing in width with advancing age until, in the very old, they may extend two centimeters lateral to the midline; the endothelium-lined lumen of the lacunae are usually reduced to a spongelike labyrinth by numerous arachnoid granulations and dural trabeculae.

Synonym: lacunae laterales, lateral lacunae, lateral lakes, parasinoidal sinuses.