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Cavity Structural Effect. The Cavity Structural Effect (CSE) was discovered in spring 1983 by chance by Viktor S. Grebennikov (1927-2001), entomologist and painter, when he moved his hand over multi cavernous bee nests and felt warmth emanating from them.
However, the small size or shape of the Chiari skull is mismatched to the size of the brain. Thus, a crowding of the brainstem, cerebellum, and tonsils occurs. Crowding pushes the tonsils out of the skull through the opening (foramen magnum) where the spinal cord exits (Fig. 2). Herniation of the cerebellar tonsils can extend several millimeters below the foramen magnum. The tonsils put pressure on the brainstem and spinal cord, block CSF flow, and result in the Chiari signs and symptoms.