Brain herniation into giant arachnoid granulation: An unusua
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Arachnoid granulations represent growths of the arachnoid membrane into the dural sinuses through which CSF enters the venous system and are macroscopically visible. They range from a few millimeters to more than 1?cm (giant arachnoid granulations) and consequently may grow to fill and dilate the dural sinuses or expand the inner table of the skull. Rarely, they cause symptoms related to venous hypertension secondary to partial sinus occlusion and usually they are incidental findings. The presence of preexisting arachnoid granulations facilitates the formation of brain herniation into the dural venous sinus (DVS) or adjacent calvarium. The herniations of brain parenchyma into arachnoid granulations are thought to arise spontaneously or as a result of increased intracranial pressure. We report a rare case of a brain herniation into a giant arachnoid granulation in an asymptomatic elderly male patient, which was discovered incidentally.

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